The Profile Spline Drive sprocket from has manufactured in the USA out of 7075 aluminum. The Profile Spline Drive Sprocket doesn't need a sprocket bolt; instead it uses a hardened chromoly steel insert that matches the 48 splines in the Profile BB spindle. The 7075 aluminum keeps the 1/8" sprockets super strong and lasting a long time. The Profile Spline Drive comes in black, blue, red and purple.
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