6061 T-6 CNC Machined aluminum bodies.The 4 cog spacers allow you to position the cog where it provides the best chain alignment.Hub set comes with a 16t Crupi Cog but is designed to work with any Shimano compatible cog and any Shimano type tool will remove the cog.All Rhythm front hubs are designed to be radial laced; if you want to!MR24 (24H) front hubs feature an aluminum front axle & chromoly rear where the EXR28 and PRO36 hubs use chromoly axles throughout for strength. Aluminum drivers provide plenty of strength while keeping the weight down on our 24H and 28H models but the Pro 36H hub uses a chromoly driver making it stronger than ever!The Pro hub has a solid axle which reduces flex and keeps the power going directly to your forward motion. This new Pro36 hub will rival any Pro hub on the market!
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