Motobecane gear ratio

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Shamelessly ripped from here 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 testimonies 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 testimonies 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).