The R55C4-A is a specialized brake shoe cartridge optimized for carbon wheels with a rim width ranging from 19 to 28 mm. It offers just the right thickness for better clearance and effective braking on modern wider rims, ensuring both safety and performance. Extensive Bike Compatibility: These cartridge pads are compatible with a wide range of Shimano road brake systems—Dura-Ace, Ultegra, 105 series and more—including older and newer side-pull, direct-mount, dual pivot and cantilever calipers. Whether you're using road, cyclocross, or gravel setups, these pads fit right in. Advanced Design for Reliable Braking: Crafted with a carbon brake compound and segmented pad surface, the R55C4-A delivers consistent stopping power and modulation in mostly dry conditions. Its design efficiently sheds heat, dust and water, helping maintain predictable performance and pad longevity. Low-Noise, Wear-Resistant Cartridge Build: The cartridge-style design makes installation clean and simple. The brake compound is engineered to be quieter than standard pads, with enhanced wear resistance that helps protect both the pad and rim—extending service life and maintaining smooth braking. Each package includes a pair of brake shoes plus the required set screws. Everything you need is in the box, making pad replacement hassle-free and just a simple swap away.