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Backache

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Some of us have done thousands of km sitting on one, I think if it created knee problems you would be hearing about them.
I think you meant reach the pedal with the ball of the foot only....but thanks to all for your help - I am going to have a rethink about saddles height etc...

 

No....I meant what I said. When seated on the saddle it should only be possible to touch the ground only with the ball of the foot rather than the whole foot. When coming to a halt, rather than remaining seated the rider should move forward straddling the cross-bar and having one foot remaining on the pedal ready to take off.

When seated with the correct saddle height and with the pedal crank in line with the seat-tube, the knee should have a slight bend. When pedaling the hips should not rock side to side as this means that the saddle is too high.

have considered the NCX seat post but dismissed the idea on the basis that when the seat post compresses (as it must do continually on uneven surfaces?) it will alter the saddle height relative to the pedals and potentially give rise to knee problems. Or am I missing something?

I have lots of knee problems and use the ncx without issue, the post movement is both down & backwards, even over bumpy ground you don't notice any shortening of ride height, if the going is rough enough to continually bottom out the seat post, you'll probably not still be pedalling Anywho.

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