The idea behind the Spire Crank was to take the proven 2.5 piece system and combine it with a super tough, box-section arm design that will remain incredibly stiff and dent resistant. After being pushed to its limits for about a year by Bruno Hoffman and the rest of the Eclat Pro team, the end result being a crank that is super strong and reliable that's built to shred. The Spire is built from tubular heat-treated 4130 CrMo arms with a 22mm ultra hollow CrMo axle for maximum strenght and durability. ###section### Product Specs Crank Type: 2.5 Piece Drive Type: Bolt Drive Spindle Diameter: 22mm Drive Side: Left & Right Compatible Includes BB Bearings: No Weight: 901g (31.8oz) ###shogun-image-section### Colour: Black, Raw, Satin Oilslick; Size: 175mm, 170mm, 160mm