Shimano Dura-Ace 9100 Caliper Brake The all new Shimano Dura-Ace BR-R9100 Caliper Brake is the most technologically advanced brake ever designed by Shimano. It comes at you with a sleek, dark new look and a host of other new features like improved stopping power and tire clearance. It offers a more predictable, linear braking curve and a clear contact feeling with better linearity. Another of these new added features is the compatibility with 28c tire sizes, which comes at a perfect time when the industry is leaning towards the use of wider rims and larger tires. Equipped with the Dura-Ace R9100 brakes, you'll be ready to tackle everything the road throws at you. Features The best balance between rigidity, weight and stopping power More predictable, linear braking curve Clear contact feeling with better linearity Stabilizer added between axles for added stiffness Sleek, aerodynamic design with less gap between pivot arms Compatible with 28C tire size for comfort and traction over broken roads | Shimano Dura-Ace BR-R9100 Rim Brake Front