12-speed cassette 10-51

12-speed, 10-45 or 10-51 - Hyperglide+ technology

Gears: 10-45, 10-51

10-51 teeth - Micro Spline freewheel body

10-45, 10-51

10-51T or 9-45T - Just 367 grams - 12-speed

9-45 or 10-51 teeth