Andre Jute wrote:
Why are you making it so complicated?
At
http://coolmainpress.com/BICYCLINGHebieChainglider.html
you can see how simple I made it in Excel.
BTW, what formula did you use?
I made one change, shouldn't the tire be
counted twice when one computes the diameter?
Do you get the same data for the same
configuration, which is:
chainrings 34 50T
sprockets 12 13 15 17 19 21 23 25T
bsd 622 mm
tire 23 mm
Better compare notes carefully after all...
BSD: 622 mm
ti 23 mm
wheel: 622 + 2*23 = 668 mm
roll-out = chainring/sprocket * wheel
chainring sprocket roll-out
34 25 2854.1
34 23 3102.3
34 21 3397.7
34 19 3755.4
50 25 4197.2
34 17 4197.2
50 23 4562.1
34 15 4756.8
50 21 4996.6
34 13 5488.6
50 19 5522.6
34 12 5946.0
50 17 6172.3
50 15 6995.3
50 13 8071.5
50 12 8744.1
--
underground experts united
http://user.it.uu.se/~embe8573