Originally Posted by shecky
I'm not sure I understand. Are you saying running 50/25 gearing will feel different (from the pedaler's perspective) than 40/20 gearing? Even though the gear rations are the same, and given the same crank length and wheel diameter?
i say yes, they will feel different
Originally Posted by mister boo
The torque will be affected by the crank length only. The size of the chainring makes no difference as long as the ratio stays the same. Wheel size has an effect at the other end. ie 650C vs. 700C at the same number of gear inches due to the rotational weight. Oh, well. You say potatoe I say potato
the torque will be affected because there is a diffence in distances between the cranks and the chainrings. this difference has an effect in calculating the moment arm of a system, and torque is similar to a moment arm in that respect (the longer the distance from the fixed point, the higher the torque/moment). the difference between a moment arm and a torque is that a moment arm is a "torque" on a non-rotational fixed system.
so, what im saying in simple words is that the difference in length between the edge of the chainring to the center of the pedal axle on the crank arm of the 2 different sized chainrings will affect the torque.
now, whether this difference is negligible or not, i dunno....but theoretically there is a difference.