Thread: 42t --> 39t: # Chain links reduced?
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Old 09-02-10, 11:37 PM
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Deanster04
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Originally Posted by HillRider
Is the 42T chainring on a single chainring crank and being replaced by a 39T or is it one ring of a double crank and the 52 or 53T big ring is going to remain unchanged? If it a double, there will be no change in the chain length at all since the big-big combination hasn't been changed.

If you are replacing a single 42T chainring with a single 39T you can, in theory remove 1 half link, but since this is impossible while having the mating ends of the chain still match, the chain must remain the same even in this case.
Amen.
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