If you’ve adjusted your caliper but still hear rubbing, check your rotor: Sometimes, they warp from a hit or even just excess heat. Larger rotors are able to dissipate heat over a larger surface area, but are heavier, so you’ll want the smallest rotor you can get away with for the type of riding you generally do. ![]() Generally, road and cyclocross use 140 to 160mm, cross-country (XC) mountain biking uses 160mm, trail riding uses 160 to 180mm (sometimes a mix, with the larger rotor up front), enduro uses 180mm, and DH uses 200 to 205mm. Rotors come as small as 140 millimeters in diameter for road and cyclocross applications, all the way up to 205mm for downhill (DH) mountain biking. Then retighten the top bolt to torque spec, followed by the bottom bolt. Hold the brake lever down to keep the caliper in place while tightening the top and bottom bolts until snug. This will clamp the caliper to the rotor. Wiggle the caliper to make sure it moves freely, then pull the corresponding brake lever hard. Usually, the caliper is misaligned.įix this by loosening the two bolts attaching the caliper to the frame or fork just enough so that the caliper can move side-to-side. If your rotor doesn’t spin freely, you know it-the resulting rubbing, grinding, and squealing will drive you nuts-and it can cost you some momentum. Calipers contain opposed pistons that sit on either side of the rotor pressure from the brake line engages these pistons, which push the brake pads inward to contact the disc. This pricier option is generally more difficult for the home mechanic to maintain.īrake levers are attached by the brake lines to calipers located on both the front and rear discs. But more bikes are coming stock with hydraulic disc brakes. Apart from price, some riders prefer cable-activated disc brakes because they’re easier to work on at home, and they’re compatible with most mechanical brake levers. This lower-cost option will allow you to spend less and still own a bike with reliable, all-weather stopping power. If you’re interested in buying a disc brake-equipped bike for less than $1,000, you’re probably going to end up with mechanical brakes. When you brake, the pressure forces the fluid to move into the caliper, pressing the pads against the disc. There are two main types of disc brakes: mechanical, which works with cables (just like rim brakes), and hydraulic, which replaces the cables with hydraulic fluid in a fully sealed line. ![]() So whether you’re a holdout or already rocking them, here’s a basic guide to bicycle disc brakes and how to make the most of them. And while disc brakes make huge impacts on your ride, they can be heavier and sometimes more challenging to maintain. What’s even better is that great braking power is now available at almost every price point. Should We Mourn the Death of Rim Brakes?.
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