Just be wary that most renthal sprockets are aluminium alloy and wear much more rapidly than steel ones. The only benefit of an alu sprocket is weight saving and, with the best will in the world, the few grams you'll save will be pretty irrelevant on hefty old XT!

Personally, I've always found steel JT and Sunstar sprockets to be reasonably priced and perfectly well up to the job.

If you want the best of both worlds (light weight and long life) then consider a Supersprox rear sprocket.

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