Disc brakes performs equally well in all conditions including water, mud, and snow, and unaffected by tyre width. The braking surface is farther from the ground and possible contaminants like mud which can coat or freeze on the rim and pads. Disc brakes are less prone to fading under heavy or prolonged braking compared with rim brakes, and the heat is not dissipated into the tyre. Disc brake pads when fully retracted ride much closer to the braking surface than rim brake pads.  This better prevents a buildup of water or debris under the pad. There are holes in the rotor, providing a path for water and debris to get out from under the pads. Wheel rims tend to be made of lightweight metal. Brake discs and pads are harder and can accept higher maximum loads. Disc brakes do not create wear on the rim unlike rim brakes, especially if grit becomes embedded in the brake pads. Disc brakes permit a bicycle with a buckled wheel to be ridden, which would not be possible with a rim brake since the buckled wheel would bind on the brake pads. When riding a mountain bike with rim brakes in thick mud, the first point that the mud builds up is usually on the rim brakes. A mountain bicycle with disc brakes is usually less susceptible to mud buildup provided the rear frame and front fork yoke have sufficient clearance from the wheels. Disc brakes are unaffected by tyre width.