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The 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.
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Product Specs
- TYPE: Spline Drive
- MATERIAL: Alloy
- WEIGHT: 81g / 2.85oz