Shimano Ultegra 11-Speed CS-R8000 11-28T Cassette Apparel_Men's Cycling Jerseys New leak-free Dolphin Breather Valve

New leak-free Dolphin Breather Valve technology keeps liquids inside

It was the weapon of choice for top World Tour contenders on CSC and the Cervélo Test Team

The polymer has new formula enhanced for more durability and comfort

LOOK axles are only approved after a rotational test of 2 million cycles at 100 rpm with a load of 90 kg on the center of the pedal and an eccentric rotation (which creates stress on each revolution)

Shimano Ultegra 11-Speed CS-R8000 11-28T Cassette Apparel_Men's Cycling Jerseys New leak-free Dolphin Breather ValveShimano Ultegra R8000 11 speed cassette provides high performance gear combinations that provide superior rider choice. The CS R8000 cassette meets durability requirements for E MTB applications