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The Supersprox is the best of both worlds-aluminum carrier with a hardened steel outer ring. Lighter than full steel and lasts longer than aluminum. I believe they even offer a limited lifetime warranty if you purchase one of their chain-and-sprockets kits. I have been running one for over a year and expect it will last as long as the chain-25-30K miles at which point you have to change out everything anyway.
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It may be a pig, but it's a pig with a rocket in it's ass!
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