Originally Posted by
slowandsteady
Having longer crank arms is in effect the same as lowering your saddle in terms of what it does to your knees.
Not quite. That's what happens at 12 o'clock, but
at 6 o'clock the effect is like raising your saddle.
Longer cranks increases the distance from top to bottom, not often an issue for the long legged, but much more of an issue for those with shorter legs. The impact of the short difference invloved depends on how close to critical any particular rider is. It's like what a dollar is worth. If you have dough, not much, but id it's your last dollar it's like gold.