Shimano Cassette 105-CS-R7101-12Speed-11-36T

Shimano 105 Cassette Sprocket, CS-R7101, 12-Speed (11-34T)

The CS-R7101-12 is a 12-speed cassette from the Shimano 105 road bike series. In contrast to the CS-R7100, it's compatible with both electronic and mechanical groupsets. With only about 15 grams more weight than the Ultegra model, it offers fast and smooth shifting, even when you pedal hard. It has the same width as an 11-speed cassette, so the sprockets are closer together.