Race Face Ride Crank Arms. Features: Forged 6066 aluminum arms at a great price Cinch system 24mm spindle, offering the same modular design as Cinch 30mm cranks, meaning a wider 24mm spindle can swapped out later for 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, use RF-2925 for English 68/73mm shell Specs: Speed:- BCD Rings:104mm (separate) Interface BB:Cinch (separate) Length:170mm Color:black