The idea behind the Spire Crank was to take the proven 2 & ½ piece system and combine it with a super tough, box-section arm design that will remain incredibly stiff and dent resistant. After a year of testing from Bruno Hoffmann and the rest of the PRO team, the end result is a super strong and reliable crank built to shred. 

Specification:
- Material: Tubular heat-treated 4130 crmo arms & crmo axle
- Length: 160mm, 170mm or 175mm
- Axle: 22mm crmo ultra hollow
- Strong, lightweight crank 
- RSD & LSD compatible
- 22mm hollow heat-treated spindle
- Smooth and rounded ankle friendly spindle boss