Sunrace CSMZ903 12sp Cassette 11-51t - Black CheckoutSpec= 9mm Compatible handlebar inner diameter range:

Compatible handlebar inner diameter range: 18 mm - 21

For the smoothest feel

infinitely variable from 90

round or oval

easy to install

Sunrace CSMZ903 12sp Cassette 11-51t - Black CheckoutSpec= 9mm Compatible handlebar inner diameter range:Lightweight wide range mountain cassette compatible with HG 8 11sp freehub bodies Fluid Drive Plus shift enhancing design 7075 aluminum largest 3 cogs, all other cogs are steel 7 cogs on 2 aluminum spiders, aluminum lockring and spacers Compatible with Shimano 12 speed drivetrain TECH SPECS model CSMZ903 freehub type HG speed 12 range 11 51 cogs 11,13,15,17,19,21,24,28,33,39,45,51 color black weight 517g