Shimano Ultegra R8100 Road Brake Caliper – Front The Shimano Ultegra BR-R8100 Brake Calipers offer a clear contact feeling while balancing rigidity, weight, and stopping power. Even though the clearance was increased to accommodate 28mm tires, these calipers are still sleek and aerodynamic. Sleek design allows for a narrower gap between arms Wider tire clearance and compatible with wider 28c tire size Average weight: 182g