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Under or over chain tensioner


GregC

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Im busy constructing a tensioner, I wanted the roller under the chain to maximize the wrap around the rear sprocket, but I cant seem to get the chain length to work in this scenario. If i remove another link, the chain will be too short, but if i leave it as is, it seems way too long and touches the chain stay.

Running 17 and 34 ratio.

Any ideas?

Thanks

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