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237 uses a sproket chain setup (has for many years now) for our systems. Using 35 chain and sprockets does wonders, we've found it to be a great reliable system. It easyer to change a blown chain than to have to pull a gear bow and do damage cointrol. if the system is over stressed, the chain is usually the first to go rather than the gears being chewed. its more of a user friendly/pit friendly setup, most teams have chain, but it might be hard to find a team with a spare (insert gear specs here)..
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