Here’s S&M‘s new American made, spline drive only sprocket. This 3D CNC’d 1/4″ thick 7075 T-6 Aluminum sprocket has a 4Q baked, 4130 chromoly, 48 spline insert with a built in spindle washer and improved tooth profile. These only fit 19mm, 48 splined spindles like the Profile spindle.
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