Replacement inserts for use with Shimano Dura Ace Ultegra and 105 brakes. Also compatible with all Sram brake sets Designed for use on wheels with an aluminium braking surface Pack contains 2 brake inserts (1 pair) can be used on either front or rear brakes Can be used on any tubular or clincher rim (aluminium braking surface) Water and Dirt Dissipation groves High performance Plus compound gives the best braking performance in all conditions - resulting in maximum braking power positive braking feedback and durability. Perfect replacement inserts for reliable and consistent braking performance in all weathers - particularly in typical British conditions. How do I know if my brake pads need replacing? There are a number of ways to tell: the first thing to check is the brake pads surface and wear markers. If the pad is worn-out the pre-cut grooves in the pads contact surface will have completely disappeared or the pads are worn down to the wear markers - if so you need to replace them immediately. Other signs to look out for: significant fall-off in braking performance squeaking sound when brakes are applied a gritty scraping sound means the metal of the brake shoe is hitting the rim a sticky/juddering feeling when braking indicates uneven wear and is sticking to the rim - if any of these symptoms occur replace your brake pads immediately. Why do I need to change my brake pads? Braking efficiency decreases and stopping distances increase when pads wear to a dangerous level-magnified in wet conditions.