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Can I swap in a 20 t top gear without changing bottom gear or chain? Any advice appreciated I'm getting anxious to buy some parts and start the season with a few small mods. Thanks. F-5er.
 

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You cannot. Try 21-42. Same ratio.

I tried to STRETCH the chain and put the 20-40 combo in....no go.

Gotta have a longer chain for the 21-42, but it fits the chain perfect. No slack.
 
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