The wider clearance makes it compatible with larger tire sizes such as 28C. The stabilizer between the axles reduces deformation and improves the braking efficiency, offering a clear contact feeling with balanced rigidity, weight and stopping power. Top Features of the Shimano Ultegra R8000 Brake Calipers Model Number : BR-R8000 Series : ULTEGRA Brake Type : SLR EV Dual Pivot Average Weight : 182 g (Front) 178 g (Rear)