Madera Helm Spline Drive SprocketThe Madera Helm Spline Drive sprocket is manufactured from 7075 Aluminum in the USA. This sprocket requires no sprocket bolt. Instead, it has a hardened CrMo steel insert in that matches up to the 48 splines on the BB axle for pure, direct power transfer. Work on 19mm spindles only. ###section### Product Specs TYPE: Spline Drive MATERIAL: Alloy WEIGHT: 81g 2. 85oz
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