Race Face Ride FatBike Crank Arms. Features: Forged 6066 aluminum arms Cinch system 24mm spindle, offering the same modular design as Cinch 30mm cranks, meaning a wider 24mm spindle can swapped out later for non-FatBike use Proprietary Cinch system removable spider can convert between existing chainring standards and Direct Mount spiderless rings, and even remain flexible to future developments Choose a spider or use a Race Face Direct Mount Narrow Wide ring (sold separately) *BB sold separately Specs: Speed:- BCD Rings:104mm (separate) Interface BB:Cinch (separate) Length:170mm Color:black