Profile Cranks with US Bottom Bracket

Designed and built exclusively for BMX Racing - 4140 aircraft alloy, 48 spline spindle, heat treated and 100% guaranteed - Profile Racing's superior computer designed 4130 chromoly crank arms reduce stress and eliminate flex. Floating spindle allows precision chain alignment. Save weight and upgrade to a titanium spindle. Limited lifetime warranty (arms and spindle, to original purchaser), Titanium parts excluded.