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TLR 200 Chain & sprocket sizes ?

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Just wondered what people have found is the best combination of chain and sprockets for a TLR 200 that will solely be used in competition.

I'm thinking of 9 tooth gearbox but what size rear wheel and what chain ? 428 or 520 ?

Yes I went 9x44 and I found the 9 a bit to low so using 2nd gear instead of 1st most of the time. I think 10x44 would be good! And 520 chain.

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