Shimano Ultegra ST-R8000 Rear Brake Caliper

New Ultegra BR-R8000 dual-pivot brake calipers are more compact than before, but yet have enough clearance to officially handle 28mm-wide tires.

A small steel bridge joining the pivots reduces flex under hard braking, 

• Precise contact feeling with balanced rigidity, weight and stopping power
• New design features additional stabilizer between brake arms to reduce deformation and improve efficiency
• Sleek design with a narrower gap between arms
• Wider clearance with larger tire sizes (up to 28C)