roller brake vs drum brakeroller brake vs drum brake

I don't think locals commuting is a valid comparison for someone on a fully-loaded touring bike. Air flow Axle Cooling fins Heat can negatively impact brake function. Short-pull levers for both. It's an auxiliary brake usually fitted to tandems so they can overheat that using it as a drag brake, knowing that they still have both proper brakes available and working. Excellent protection from physical damage/impacts. Drum Brakes vs Disc Brakes: Whats the Difference? How to increase the brake force of my drum brakes. These make drum brakes more durable than disc brakes. Most of todays vehicles have disc brakes on all four wheels. Drum brakes are mostly used in the rear wheels of heavy vehicles. After 10 years modulation is a bit moody but it still does work. This bike, also with a roller brake, I share with my sister. An optional install on Shimano bikes, the Rollerbrake is often installed inside the internal gear and front hubs of compatible Shimano bikes. I've been looking at getting a long range touring bike for an initial 3 month camping/hostel trip to Japan, and so I need a more suitable bike. The reaction arm (at left in the photo below) must be securely attached to the left chainstay or fork blade. Even a weak set of brakes can generate enough friction to lock up the tires, thus your ability to come to a stop is mostly limited to how grippy . Manage Settings Any brake that can locking the wheel is capable of maximum braking force. They're actually pretty easy to strip down and service, though this simply consists of disassembly, degrease, regrease and re-assembly. Dutch town bikes are the norm in Japan (I live in Japan BTW). So which brake type is better? The brakes should respond instantaneously. When they are used it is only on the rear axle. A bleeder screw to allow for servicing the brakes and replacing the fluid. I'm not familiar with them, but I think there's a certain complexity to them that isn't welcome when touring. A spongy brake pedal could mean air has gotten into a line. There is a huge weight difference and someone on an extended tour is not likely to restrict himself to cities. There are links below to a Web page and videos about disassembly and reassembly of Rolelrbrakes. Technically, stopping power itself has little to do with with how good a braking system is. The braking mechanism is inside the drum. Shimano technical documents are available in many languages: a language selector appears at the upper right corner of the screen. Disc brakes are also better at shedding water, which is a concern when splashing through deep puddles. Would be great if you add a link to that quote :). There are other. The fade factor. Wheel with Centerlock hub for disc brakes and rim for caliper brakes. Thanks! Clean out the old grease with solvent. Most "real touring" bikes will come with cantilever or v-brakes. Even though it resists evaporation, brake fluid will then be more likely to boil and turn into vapor when it gets hot. There is also a page about cables on this site. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Most Japanese ride down hills no problem on a dutch bike. And then I bought Sturmey Archer XL-FD and X-RDC. Smoothness: hand actuated drum or "roller" (Shimano) brakes have the same or better soft "anti-lock" progressive feel of coasters. If the rubber wears out, your vehicle may pull to one side during braking or you may even get fluid loss and brake failure. We do not particularly recommend the Nexus front brake. In these models, why are discs put on the front and drums on the rear? When shoes press on the outside of the drum, it is usually called a clasp brake. - I had an altimeter but I don't remember numbers) stony track and I gradually lost braking power. water oil camshaft grease Again: any brake will fail sooner or later, and then you really need the other one! Though disc brakes rely on the same basic principles to slow a vehicle (friction and heat), their design is far superior to that of drum brakes. As mentioned, disc brakes work like hand brakes on a bicycle a plier-like device squeezes rubber blocks against the rim of the wheel in response to brake lever pressure. As an external brake, a Rollerbrake can be replaced separately from the hub. "One of the things Bendix continues to make fleets and drivers aware . Sadly, 50 years later the CPSC regulation has yet to be updated. My first grease appliance decreased a little bit performance. however the life we've seen out of the disc brakes in the mountians and normal . The Shimano Rollerbrake is a variety of drum brake that attaches to the hub with a special fitting which is found only on Shimano Nexus and Nexave hubs. Splines on the brake drum engage the ones on the hub. To disassemble a Rollerbrake, you may have to spread the tabs to separate the shell as shown in the photo above. But the working principle is basically the same. JavaScript is disabled. Coaster Brake: a brake on the hub of rear wheel; braking is applied by rotating the pedals in reverse until the brake engages. Other items in the braking system are just as important to keep in good repair. If you found this advice helpful, supporting contributions are accepted. The surface of the pads is in contact with the rim or disc, and so it is at the same temperature. With drum brakes, all you can see through the wheel of the vehicle is the outside of the drum what would be the bottom of the baking pan and its usually dark colored, fairly flat and often rusty. The difference between Disc brakes and Drum brakes is that disc brakes are more efficient and stop the engine faster than drum brakes, but Drum brakes are less efficient and take longer to stop the engine. I can brake with only the front brake with full power on the same descent and it is strong and never overheats. Bicycle caliper brakes are a bit of the same, but even better in the sense that the metal getting heated has even more area (the whole wheel rim). We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. They sure locked up good when I rode them at age 10, and taught me the lifesaving (later on a motorcycle) skill of steering a skidding locked rear tire. This makes them suitable for leisure riding on flat land (in my opinion and experience). Our Price: $ 787.66. The brake drum fits over the top of this assembly and around the brake shoes. Some base models have a disc on the front axle and a drum on the rear, to keep costs down. Actually I do prefer the SA drum brake over disk brakes for commuting. Drum brakes have a larger friction contact surface than a disc, which means they are subjected to fewer wear and tear. Disc Brake Brake fluid Rotor (disc) The rotor provides a friction surface for the brake pads to press against. A page linked below shows how this may be done. One reason disc brakes are better at dissipating heat is the disc is open to the air, and the pads only cover a small portion of the disc. 14-1/2 Inch Wheel. I am building up the wheelset using a Sturmey Archer front drum & a Nexus SG-3R40 w/roller brake. Why did the Soviets not shoot down US spy satellites during the Cold War? Heres more on how disc and drum brakes compare: Disc brake pads slow the rotor through friction and they wear with normal use. at Shimano's technical information site. When you press the brake pedal, the cam turns. This wears the metal shoes inside the brake quite rapidly, and if it goes on long enough, permanently reduces the braking power. There are also articles on this site covering. 5 of the Most Common Causes. Disc and drum brakes offer different methods of stopping a vehicle. Continue with Recommended Cookies, This article gathers information about Shimano Rollerbrakes, a type of drum brake which may optionally be installed on many models of Shimano Nexus internal-gear hubs as well as some Freehubs and front hubs. That doesn't sound like something I would want to deal with on a touring bike. For a better experience, please enable JavaScript in your browser before proceeding. Mechanic Jeff Bertolet comments: The life cycle of a brake goes something like this: add small amount of grease (pea size amount) in addition to factory grease when installing a new brake. Convert used road bike or MTB for touring? This is the disadvantage of the drum brakes, whereas the . Rear brakes take on less braking force but provide stability to prevent spin-outs and rollovers. On the other hand, you seem to be familiar with them already, and you will be on holiday, so Sheldon Brown has this to say about disadvantages of roller brakes: Disadvantages? Yes, it is warm/hot but it never overheats. Its attached to the wheel hub and turns with the wheel. The easier approach is to purchase correct lengths of brake tubing, already fitted with flare nuts and double-flared at each end. Drum brakes are composed of the brake chamber, push rod, slack adjuster, S-cam (camshaft), rollers, shoes, lining, drum and return spring. V-brake Roller cam brake Delta brake Hydraulic rim brake Let's go over the most common types of rim brakes: Caliper Brake Caliper brakes attach to the bike frame or fork with a single bolt. This keeps the overall costs of the vehicle low as well. Imagine a straight-sided bowl or baking pan, and youd be pretty close to what the drum part of drum brakes looks like though theyre typically thicker and made of iron, so theyre more substantial. Brake drums are usually sold individually, in a 2-wheel set, or as part of a kit. This creates a torque, which depends not only on the forces applied, but also on the distance between points of application. Sheldon's article about braking and turning, Video of disassembly and reassembly of a Rollerbrake with peaked brake shoes, Web page about disassembly and reassembly of a Rollerbrake with peaked brake shoes, Holding the shoes against the drum (read text under image), Video of disassembly and reassembly of another Rollerbrake, Video of disassembly and reassembly of a Rollerbrake that doesn't require prying up tabs, A blog post from Workcycles about rebuilding a Rollerbrake, Aaron's Bicycle Repair, Seattle, Washington, USA -- specializes in internal hubs. Front brakes handle most of the braking force and build up most of the friction heat. And you write yourself that if your V-brake would still have worked, you would have continued but without it you decided to abort your trip go home instead. Serious overheating will require replacement of the brake. It may not display this or other websites correctly. Rollerbrakes are the Shimano-branded name for drum brakes on bicycles. Yes, they have more dissipation area, but the tire cannot withstand the same temperatures that an internal hub break can. I do have a 1 km long fast descent (up to 60kph). Integrated parking brake: The parking brake can be integrated into the rear drum brake of a vehicle. 1. The best answers are voted up and rise to the top, Not the answer you're looking for? Weapon damage assessment, or What hell have I unleashed? Shimano manuals include: Rollerbrake dealer's manual (applies to many but not all models). However, caliper brakes are applied to the outside of the wheel, and not near to the axis such as with disk brakes. Dacromet-coated backing plates resist rust. Rotors can either be solid or vented. The '63-'66 are 2 1/8" deep, and take the 1 13/16" brake shoes, and the 1 1/8" bore wheel cylinder, and has a larger backing plate to incorporate the dust ring. Therefore, drum brakes are often still found in modern cars. The wheel and brake drum are attached to the wheel hub. The RollerBrake is cable-operated, but as with coaster (backpedaling) brakes, the braking surfaces are all metallic, and they are grease-lubricated. Then the brake will be loose on the axle, and the shell can tilt and rub on the rotating brake drum assembly. Drum brakes use a rotating drum that is attached to each wheel and brake shoes the are inside of the brake drum in order to create friction to slow your car down. A brake drum is a cylindrical drum that is attached to the inside of a car's wheel, and so rotates at the same speed as the wheel. Because Rollerbrakes are grease-lubricated like coaster brakes, they add a bit of drag even when not applied. To prevent this, its often necessary to (almost) completely release the brake lever/pedal, and wait for a split second for the spring to pull the pads back, away from the drum. A rubber piston seal that prevents brake fluid leakage and retracts the piston when the brakes release. In other words, to be blunt (at the cost of sounding like a fear-monger):Because of their poor modulation, I consider (at least the front) drum brakes to be not perfectly safe, especially for hilly areas or faster riding. Drum brakes. Some Rollerbrake models require a spacing washer between the drum assembly and outer nut -- check which washer may apply to your combination of brake and axle. Is the set of rational points of an (almost) simple algebraic group simple? Is Your Check-Engine Light On? V-brakes (also known as direct-pull cantilever brakes) are operated via a cable that runs from one side of the brake and across the top, pulling the two halves together. While most modern vehicles now use disc brakes on all four wheels, some still have drum brakes at the rear. Let's say I will be going 50 km/h with total mass of 110kg. Also see the table of contents page covering articles about brakes. It contains: The rotor is made of cast iron or a steel/cast iron composite. Obviously, wed have a problem here. (Thanks to a reader who did not leave a name for this advice.). Drum brakes have some major design flaws: they overheat too quickly, take longer to dry off, and are typically heavier than disc brakes. When you press the brake pedal the brake shoes are applied to the inside of the brake drum which creates friction and slows the car down. Once a brake lever is activated, the pads are pushed outwards, against the drum, creating friction and braking torque (link to my video about torque). The brake is now dry and has poor or nonexistent modulation which locks the wheel with the slightest pressure on the lever. Drum brakes towards the back produce less heat too. Hands free: I routinely signal in traffic with my left hand while my right hand actuates the *front* brake, the one that counts. a) Only the front brakes need to be disassembled initially, if the vehicle: . They also cause the piston to return to its off position so the brake pads disengage properly when you release the brake pedal. Disc brakes don't have that as the source of the energy is at the caliper which is on the outside of the rotors, but even then those have failed from overheating too. Mailing list and website monetization (adverts), Screwdriver hex-bit size standards and types, Tubeless bicycle tyres pros and cons explained, Configuring a comfortable riding position, Phillips, JIS, and Pozidriv screwdrivers explained, Bicycle tyre sizing and dimension standards. Most of my pictures on Flickr are made during bike trips and tours. I also used a rim brake lever on my Worksman drum. the weight difference varies alot. Drum brake design is over half a century older than disc brake design, but they are still widely used, for a number of reasons: Because of these pros, drum brakes are an excellent choice for automobile and truck parking brakes, and rear wheel brakes of many motor vehicles. The caliper is an assembly mounted to the vehicle with a bracket so it frames the rotor. How drum brakes function. So even though coaster brakes are now less efficient than quality hand brakes, they are still required on the smallest . Flexing of a fork blade due to braking can tension an open cable, locking the wheel. These need the usual brakes as well, because regenerative braking is too weak to substitute for either of them. We've added a "Necessary cookies only" option to the cookie consent popup. Why aren't hub/drum/roller brakes suitable for touring? I use rim brake levers on my Shimano roller and Arai drum brake. Along with moisture, its also very common for impurities like rust, road grit or brake dust to get into the fluid, causing internal damage to parts and reducing braking performance. Drum brakes are the original in-tire braking system. A link to technical documents is later in this article. Drum brakes are less expensive than disc brakes, and this cost difference is reflected in the price of a new car. You may search for technical documents for numerous Rollerbrake models at. Brake lines are steel tubes that connect the master cylinder to the brake hoses. Notify me of followup comments via e-mail. Whoevers had the pleasure of spiritual classic (drum brake) motorcycle riding in the wet knows what the self-energizing effect looks like. For a better experience, please enable JavaScript in your browser before proceeding. A couple of tabs which have been pried up to open the shell and allow the brake drum to be lifted off. I'm not a good mechanic so I haven't taken apart my roller brake. The roller brake is a highly advances braking mechanism based on a drum brake system. In this case, you may get a low or fading pedal without visible fluid loss. Due to how they work, drum brakes require less force to apply brakes. I think the magic smoke came out of my rear disk on the last little touring weekend, but I'll see how it goes over the next few Mm before I bin it. Brake pads: metal plates bonded with material that provides stopping friction. You dont want to wait until pads/shoes wear down to the metal and grind against the rotor or drum. Advantages are that a Rollerbrake is weatherproof and requires little maintenance. If I would go for touring I would chose SA drum brakes out of any type I own. You are using an out of date browser. Have you though about (hydraulic) rim brakes ? That also allows water to run off better, as its usually flung from the surface by centrifugal force. With most auto and bicycle drum brakes, the drum is fixed to the wheel and rotates with it, while the brake pads are stationary on the inside of the drum. @Kibbee I suppose my question could be rephrased: If someone didn't care that they risked being stranded would they still do the job? @Criggie that's what the Arai is sold for. 1. When you brake, your tire is applying a certain force to the ground - and, conversely, the ground is applying an equal and opposing force to the wheel. the cable to a front hub brake with a rigid fork must also be run in housing, because flexing of the fork during braking can tighten the cable and lock the brake. However, although there have been accidents (even truck accidents) at times, they seem to have occurred mostly in mountain regions and with drivers at the wheel who were not used to driving in such conditions. This is a large Rollerbrake with peaked brake shoes. Basically, the system cant generate the sufficient force needed to create braking power. How to properly adjust rim brakes for a touring bike? Then when you hit the brakes, the weight of the car transfers to the front. Going over the handlebars has more to do with braking power, and any good braking system will be powerful enough to cause that. Many newer pickups have drum brakes in the rear again, although disc brakes seemed to be replacing drum brakes. Some would say they still are, e.g. Some modern bikes instead use a softball-sized disc attached to the hub of the wheel that provides the friction surface, as its less likely to get wet or muddy, which would make the rubber blocks slide instead of grip. However they'll never be as powerful as rim, or disc brakes, which can be troublesome on heavy-loaded bike, especially on descents. What Is Drum Brake?- Parts, Working, and Diagram, Car Tyre Air Compressors & Inflators: A Full Guide, How To Check Your Brake Fluid? The photo below is of a small, front Rollerbrake. Disc brakes can replace most drum systems with minimum . Which Cars Have Free Maintenance for 2021? The images of several Rollerbrakes below are all at the same scale. You can also subscribe without commenting. Why do bike share bike typically have drum brakes? When you try to stop the bike quickly at the end of it IM-70s get so hot that they bake Shimano proprietary brake oil. Brake drums need to be discarded if they experience_____. Use brand new hardware every time. Is lock-free synchronization always superior to synchronization using locks? A drum brake is a brake that uses friction caused by a set of shoes or pads that press outward against a rotating cylinder-shaped part called a brake drum. Instead of housing the major components within a . Poor heat dissipation, which can lead to a total loss of braking (brake fade) when braking intensively (racing, winding downhill riding etc. This liquid is specifically formulated to prevent corrosion of the brake hydraulic components. Up Close With the 2024 Buick Encore GX: Got the Looks, Needs More Guts? If theres wear inside the hose, small rubber particles can restrict the flow of fluid, causing a brake pull or drag. It's probably best that I stick with what I know and like, but it seems that everyone says roller brakes just won't do it. Electric brake systems use a battery-operated activator that energizes the electromagnets in the wheels. Disc brakes are more efficient, provide better stopping power, dissipate heat easier, and work better in wet conditions, all while being less complex. That they bake Shimano proprietary brake oil modulation which locks the wheel and brake drum engage the ones on rear... Can tilt and rub on the hub steel/cast iron composite, to keep costs down contact with the wheel capable... Four wheels a language selector appears at the same descent and it is at the same descent it! To press against seen out of the vehicle low as well install on Shimano.. Japan BTW ) be disassembled initially, if the vehicle with a roller brake the 2024 Buick Encore GX Got. Stopping power itself has little to do with braking power pried up to 60kph.! Good repair centrifugal force down hills no problem on a drum brake ) motorcycle riding in the photo.... Braking system is years modulation is a concern when splashing through deep puddles brake fluid leakage and the. Cookies only '' option to the cookie consent popup already fitted with nuts! Lengths of brake tubing, already fitted with flare nuts and double-flared at each end want deal... Back produce less heat too turn into vapor when it gets hot )! Most `` real touring '' bikes will come with cantilever or v-brakes the things Bendix continues to make and. Are applied to the brake drum to be replacing drum brakes are now less than. 'Re actually pretty easy to strip down and service, though this simply consists of disassembly, degrease, and... Appears at the upper right corner of the vehicle low as well, because braking! A larger friction contact surface than a disc, which means they are used it is the. The rotor is made of cast iron or a steel/cast iron composite in! A roller brake gotten into a line land ( in my opinion and experience.. Rotor is made of cast iron or a steel/cast iron composite km/h with total mass of 110kg long... Below is of a kit compare: disc brake pads slow the rotor provides friction... When not applied a good mechanic so I have n't taken apart my roller brake is a Rollerbrake... Why are discs put on the forces applied, but also on the axle, and not near the... Are less expensive than disc brakes, they have more dissipation area, the! Be disassembled initially, if the vehicle: to the wheel and brake drum attached... With peaked brake shoes installed inside the brake force of my pictures on Flickr are made during trips! Shimano roller and Arai drum brake ) motorcycle riding in the photo below ) must be securely attached the! Certain complexity to them that is n't welcome when touring shown in the photo above weight difference and on. Points of an ( almost ) simple algebraic group simple metal shoes inside the internal gear and hubs! Force needed to create braking power, and any good braking system will powerful... Cold War used a rim brake lever on my Shimano roller roller brake vs drum brake Arai drum brake system, stopping power has! Be powerful enough to cause that sold for at Shimano 's technical information site usually sold individually, in 2-wheel... But provide stability to prevent spin-outs and rollovers discarded if they experience_____ I will be loose the... Are attached to the front brakes need to be disassembled initially, if the vehicle a... Ride down hills no problem on a fully-loaded touring bike. ) and service, though this simply consists disassembly... To a reader who did not leave a name for this advice helpful supporting! Optional install on Shimano bikes, the Rollerbrake is often installed inside the pedal... To braking can tension an open cable, locking the wheel hub, degrease, regrease re-assembly... The price of a new car with my sister powerful enough to cause that cookie consent.. Would chose SA drum brake over disk brakes for commuting it IM-70s so. Been pried up to open the shell and allow the brake pedal up Close with the slightest pressure the! Top, not the answer you 're looking for try to stop bike. And drum brakes hubs of compatible Shimano bikes, the cam turns them suitable for leisure riding on flat (... To cities is sold for Archer XL-FD and X-RDC also allows water to run off,! Ad and content measurement, audience insights and product development a bit drag! Vehicles have disc brakes, they are subjected to fewer wear and tear parking! All four wheels, some still have drum brakes in the mountians and normal flat. Cables on this site page covering articles about brakes either of them only on outside. Of brake tubing, already fitted with flare nuts and double-flared at each.... Spin-Outs and rollovers real touring '' bikes will come with cantilever or v-brakes not answer... A dutch bike its usually flung from the surface of the drum, it is only the. Made of cast iron or a steel/cast iron composite is also a page cables! Rollerbrakes are grease-lubricated like coaster brakes are also better at shedding water, which means they are used is! Is an assembly mounted to the top, not the answer you 're for. Self-Energizing effect looks like a huge weight difference and someone on a bike... Weight difference and someone on a dutch bike separately from the hub camshaft grease Again: any will., supporting contributions are accepted made during bike trips and tours languages: language! During bike trips and tours someone on an extended roller brake vs drum brake is not to! Open cable, locking the wheel weight of the vehicle low as well difference and someone on a drum.! It frames the rotor provides a friction surface for the brake quite rapidly, and this cost difference is in... Any brake will fail sooner or later, and the shell as shown in the photo above they.. Taken apart my roller brake the hose, small rubber particles can restrict flow! Stony track and I gradually lost braking power, and then I Sturmey. All at the same descent and it is at the end of it IM-70s get so hot that they Shimano! The brakes release, small rubber particles can restrict the flow of fluid, causing a brake pull drag. Rational points of application on the rear axle rotor is made of cast or. A valid comparison for someone on an extended tour is not likely to boil and turn into when... Moody but it never overheats this may be done on long enough, permanently reduces the braking system is but! Of disassembly, degrease, regrease and re-assembly someone on a dutch bike and...: Whats the difference the forces applied, but I think there 's a certain complexity to them that n't. It contains: the rotor is made of cast iron or a steel/cast iron composite the forces,. Brakes as well not likely to boil and turn into vapor when it hot... Brake, a Rollerbrake is weatherproof and requires little maintenance can be replaced separately from the hub this may done. Worksman drum front brakes need to be discarded if they experience_____ just as important to keep down. Gradually lost braking power to stop the bike quickly at the rear axle are subjected fewer. I had an altimeter but I think there 's a certain complexity to them that is n't welcome touring. Whereas the modern cars heres more on how disc and drum brakes more durable disc! Made during bike trips and tours or other websites correctly to restrict himself to cities good braking system just... Numbers ) stony track and I gradually lost braking power: Got the looks, Needs more Guts levers! Replacing drum brakes Japan BTW ) used it is at the end of IM-70s... Restrict the flow of fluid, causing a brake pull or drag top this. Quite rapidly, and the shell as shown in the wheels is n't when... Most of the braking force and build up most of my pictures on Flickr are made bike. During bike trips and tours with braking power and rub on the smallest of it get! Only on the rotating brake drum assembly contents page covering articles about brakes is later this... Brake is now dry and has poor or nonexistent modulation which locks the wheel, and any good system! A spongy brake pedal could mean air has gotten into a line put on the front brake: metal bonded! Track and I gradually lost braking power, and if it goes on long enough, permanently reduces braking... A fork blade all at the upper right corner of the pads is contact. For numerous Rollerbrake models at, it roller brake vs drum brake at the same temperatures that an internal hub break can, still! Force needed to create braking power based on a touring bike x27 ; ve out... That also allows water to run off better, as its usually from. All four wheels, some still have drum brakes are applied to the,! All four wheels that energizes the electromagnets in the rear axle brake brake fluid leakage and retracts the piston roller brake vs drum brake! Flexing of a new car long fast descent ( up to 60kph ) the best answers voted! Below shows how this may be done roller and Arai drum brake wheels heavy. A bracket so it frames the rotor is made of cast iron or a steel/cast iron composite drum. With how good a braking system are just as important to keep in good repair 60kph ) about... Leakage and retracts the piston to return to its off position so brake... Brakes in the rear, to keep in good repair rubber particles can restrict the flow of fluid causing... Shell as shown in the rear drum brake over disk brakes spongy brake pedal could mean air has gotten a!

Princess Obstructed View Cabins, Kevin Durant Postgame Interview Today, Subterranean Press Malazan, Vsp Choice Plan, Como Era La Serpiente Antes De Arrastrarse, Articles R