Robert wrote in message ...
Trevor Jeffrey wrote:

The knee position remains the same it is the foot and lower leg which are
affected by cleat position.

Yes that's technically true, but it does change the
torso-to-upper-leg-angle slightly, as if one had moved one's seat
*forward* a little bit (not back, as Sorni was implying with the KOPS
reference). Even if the knee position relative to centre bracket is
unchanged, the new angle will cause different loadings on the leg
muscles and knees and this will be felt to a greater or lesser degree,
depending on how well your knees behave in general.

I moved my cleats *back* on my shoes and got a much more restful riding
position, but started getting slight knee pain as well. I have now
shifted my seat forward approx. 8 mm to get back to the original
torso-leg angle and problems have disappeared. Of course to get same arm
stretch forwards, I now have to choose between increasing my handlebar
stem length from 120 to 130 mm or cheating a bit by sawing 1 cm off my
steerer tube to drop the bars a bit.


The knee pain is most probably due to over extension, a slight lowering of
the saddle would have left the knee more bent in its lower position so
reducing femur rotation. It is the femur rotation which seems to upset the
proper functioning of the knee during cycling. Generally a bad move to
lower handlebars except in short distance racing. Try the lowered seat
position.

Trevor