SHIMANO ULTEGRA CS-R8101 12-SPEED CASSETTE exclude_premium_shipping Compatible battery: BT-EN805 (504Wh) /

Compatible battery: BT-EN805 (504Wh) / BT-EN805-L (504Wh) / BT-EN806 (630Wh)

Compatibility: BOSCH Gen4 Smart System motors

Brake Pads Included: Yes

It can clamp tubes from 23 to 76 mm (7/8" to 3") in diameter

SHIMANO ULTEGRA CS-R8101 12-SPEED CASSETTE exclude_premium_shipping Compatible battery: BT-EN805 (504Wh) /Great speed means great responsibility. That's why, faced with the task of making the new ULTEGRA groupset even faster, Shimano decided to take a holistic and 100% performance focused approach. Shimano's new 12 speed road groupset delivers unparalleled control and comfort anytime, anywhere whether you're competing in an amateur race, chasing your personal best, or out for a social ride. That is "Science of Speed". And it's what sets SHIMANO apart from