SunRace CSMZ903 Cassette - 12-Speed 11-51t Black Chrome Model=40-Series ZS - Zero Stack Headset Rear axle conversion kits convert

Rear axle conversion kits convert your hub to fit a new axle measurement or for a new group set

Features a 14-tooth upper and 18-tooth lower aluminum pulley wheels with Grade 3 Silicon Nitride balls to provide absolute optimization of the rear derailleur

With no mounts or screws the bags come in three different sizes to suit any frame

9mm Valve Presta Wheel Weight 785g Rim Drilling 28 Wheel-Brake Comp

SunRace CSMZ903 Cassette - 12-Speed 11-51t Black Chrome Model=40-Series ZS - Zero Stack Headset Rear axle conversion kits convertThe SunRace MZ 12 Speed Cassette offers a wide ratio design. Range 11 51 Cogs 11 13 15 17 19 21 24 28 33 39 45 51 Cassette Body Type Shimano HG Drivetrain Speeds 12 Color Black Chrome Weight 497 Defined Color Black