Alpha, Thanks for posting the crank-length calculator. I have never seen a formula for this before.
I measured my leg at work, and the formula indicated that need 182mm cranks. I don't think so. I am
5' 8.5". I think I need to re-measure.
When pedaling with my 170mm cranks on my Vision R40 my knee forms an acute angle at the top of the
stroke. Is this true for you other riders? Intuitively, I would think this to be inefficient.
I remember the first time I climbed on the thing the stroke felt really long. I felt like I was
pulling my knees up too close to my stomach.
I just won an eBay auction for 155mm cranks. I'm not sure they will work on my bike or with my
chainrings but I figgered I could re-sell em if I need to. I got them cheap enough. I recognize
wisdom in making smaller incremental changes in a critical area like this, but by my observation I
would need this much of a change in crank length to make my knee a right-angle at the top of the
stroke. Is this a desirable goal? Considering the problem from the perspective of the stair climbing
scenario, I'd think I would even want to go smaller yet.
GeoB
> You should check to see if you have the correct crank length your body measurment.
>
> Peter white cycles has a fitting guide in which is suggested how you should measure your crank
> length.
http://www.peterwhitecycles.com/fitting.htm.