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And did we mention faster race times due to reduced friction?
The large lower pulley uses a custom designed XD-15 bearing for quick alignment with the cassette cogs and less friction and noise. The Enduro Idler pulley replaces a bushing with a bearing in order to decrease shift friction by a noticeable amount, especially when shifting up to the larger cogs.
XD-15 high-nitrogen steel alloy races are corrosion proof and long-wearing. They are matched with Grade 3 Silicon Nitride ceramic ball bearings.
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