Sunrace CSMZ903 12sp Cassette 11-51t - Black S.H.I.S.-ZS44/28.6 / EC44/40 } Butyl rubber tubes in

} Butyl rubber tubes in a wide range of sizes and valve lengths

Lighter and More Comfortable – 167 grams lighter than previous models for optimal comfort and fit

The easy step in makes putting boots on and taking them off a breeze

Which is pretty rad

Sunrace CSMZ903 12sp Cassette 11-51t - Black S.H.I.S.-ZS44/28.6 / EC44/40 } Butyl rubber tubes inLightweight 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