Our 3-Piece Crankset is simple but awesome and durable for all situations. Two three piece Cr-Mo tubular crank arm with one pinch bolt and a Cr-Mo forged spindle.Here the Details:CRANKSET- three piece cr-mo tubular crank arm with one-pinch bolt- 31.8mm oval shape arm- 8T-19mm spline spindle interface- flush machined chainwheel interface- Length: 175mm SPINDLE- 8T-19mm cr-mo cold forged spindle- 2*sealed bearing with alloy cup for American type BB shell- Alloy cone washer, tube spacers, adaptor, spindle bolts