Motobecane gear ratio

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Shamelessly ripped from here: http://www.mobcustom.com/2765-les-raisons-transmissions-finales-mob and translated using Babel Fish


Thus I make some calculated all the ratio of reduction gearing of transmission which goes from 9 to 13 teeth for the pinion and 42 to 60 teeth for the crown and I classified these transmissions of shortest (acceleration) with longest (point). And thanks to testimonys on the forum I could supplemented while indicating which transmissions can be drawn by a mob origin with a pot. I really could not make for a kit because there were not enough testimonys thus for a coupleux engine one can thus put a rather long transmission and for an engine which takes many turns one needs a rather short transmission.

9/60= 0.15 9/58= 0.155172414 9/56= 0.160714286 9/54= 0.166666667 10/60= 0.166666667 10/58= 0.172413793 9/52= 0.173076923 10/56= 0.178571429 9/50= 0.18 10/54= 0.185185185 9/48= 0.1875 10/52= 0.192307692 9/46= 0.195652174 11/60= 0.183333333 11/58= 0.189655172 11/56= 0.196428571 good potato on origin + pot 10/50= 0.2 12/60= 0.2 11/54= 0.203703704 super potato and good point with standard kit G2 (100km/h) 9/44=0.204545455 12/58= 0.206896552 10/48= 0.208333333 11/52= 0.211538462 potato like origin on origin + pot 9/42= 0.214285714 12/56= 0.214285714 13/60= 0.216666667 10/46= 0.217391304 11/50= 0.22 12/54= 0.222222222 13/58= 0.224137931 10/44= 0.227272727 11/48= 0.229166667 good point with origin + pot and good potato with small kit50+pot 12/52= 0.230769231 13/56= 0.232142857 10/42= 0.238095238 11/46= 0.239130435 12/50= 0.24 13/54= 0.240740741 11/44= 0.25 good point origin + pot but long to launch 12/48= 0.25 13/52= 0.25 13/50= 0.26 12/46= 0.260869565 11/42= 0.261904762 too long for origin + pot 13/48= 0.270833333 12/44= 0.272727273 13/46= 0.282608696 12/42= 0.285714286 13/44= 0.295454545 13/42= 0.30952381

Calculation speed for a new transmission compared to old.

Reason of the new transmission * current speed with the old one/reason of the old transmission

Example: 0.24*100/0.25= 96km/h in broken up that made 12/50*100/(12/48) = 96km/h

The result is not exactly reality because the engine will not take forcing the same number of revolutions (for a shorter transmission speed will be higher in reality and conversely).