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Profile Galaxy spline drive sprockets CNC machined from 7075 Aluminum in the USA. Requires no sprocket bolt. Instead, it has a hardened chromoly steel insert in that matches up to the 48 splines on the crank axle for pure, direct power transfer.

• Profile Galaxy spline drive sprockets CNC machined from 7075 Aluminum in the USA. Requires no sprocket bolt. Instead, it has a hardened chromoly steel insert in that matches up to the 48 splines on the crank axle for pure, direct power transfer.