The Street > The Bike Shop

chain stay length, gear ratio chart...

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Thepoolman:
I'm running 33-10 now and its too easy.  Riding around the city is way way too much work with an easy ratio and I rarely pedal when at skateparks.   Looks like ill be staying with 33-10 or 31-9.   Thanks dudes.

weedbix:
That chart is wrong. The BG chart was wrong too. This one is the most accurate:

http://eehouse.org/fixin/formfmu.php?maxRing=33&minRing=30&maxCog=9&minCog=9&stayLen=13.75&wheelDiam=19.15&isMetric=0&display=table&useHalfLink=1&stretch=0.00&axleAdjust=vert&sortKey=Stay_length

Be aware that the way some frames rear ends' are measured is inconsistent

montymitch:
I think there are simply too many variables to have a 100% accurate chart. They only time I've needed one was to see if changing from a 28t to 25t would require a half link adjustment. Chain stretch, sprocket wear, chain line, and the current moon phase all figure in to the reality of making things work right.

dude...:
yeah, once a new chain stretches it can make your back end at least half a cm longer, even more. so many threads on here about slamming the back end about 8 years ago lolz

weedbix:
True, there is variation. But it's variation from a value we CAN totally predict

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