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Is it beter to use 21/41 over a 20/39,it has the same ratio,so if i use the bigger gears 21/41 would i have anymore gains,why does ac want you to use 20/39,when you can go down one tooth on top and have the same reduction...... :wacko:
 

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The only way to answer the question would be to test them back to back. Things to consider tho 20/39 fits the chaincase very well with a 70 chain. The straighter the chain is the less power is needed to run it no deep V in the tensioner plus the rotating mass is less which should be quicker. But on the other hand 21/41 the chain will turn around the bigger gears easier and with bigger gears and bigger chain will have more rotating mass which might not be as quick
 
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