Seller notes

Pro-tek rear sprockets are completely constructed on precision CNC machines from 7075 T6 aerospace quality aluminum. We do not gear hob the teeth. This maintains concentricity with the hub diameter since both are cut at the same time. The teeth are machined to above the latest industry standards creating an accurate tooth profile that fits precisely on the chain rollers. This insures maximum chain and sprocket longevity and a more efficient power transmission. We then increase durability by brit...

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