Profile Spline Drive - 19mmRequires no sprocket bolt. Instead, it has a hardened CrMo steel insert in that matches up to the 48 splines on the crank axle for pure, direct power transfer. Available for 19mm splined axles only. 1 8 tooth width for use with most freestyle street & single speed chains. ###section### Product Specs TYPE: Spline Drive MATERIAL: Alloy WEIGHT: 76g 2. 65oz
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