Posted by bjb in Tx from Ne on July 28, 2011 at 05:34:00 from (72.37.249.52):
In Reply to: sprocket question posted by c-man on July 28, 2011 at 05:19:40:
You need to keep the same ratio of teeth. 9/17= .5294. If you want to increase the drive sprocket by 33% 9*1.333=12 then you also need to increase the driven sprocket by 33%. 17*1.333=22.6 teeth. a 22 tooth sprocket will give you a ratio of 12/22=.545 (driven spocket would turn slightly faster) and 23 would give you 12/23=.521 (driven slightly slower). Since 17 is prime, if you want the EXACT ratio you would have to go up to an 18 on the drive and 34 on the driven.
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