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The "proper" knee position is to have your knee directly over the pedal spindle (its axle) when the pedals are at 3- and 9 o'clock (parallel to the ground). Someone should be able to drop a plumb bob from your knee and have it intersect an imaginary line drawn through the center of the pedal spindle. Of course, this doesn't work for everyone, but it's a place to start.
At least I don't leave slime trails.
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2009 Giant Avail 3 |Specialized Jett 143
2013 Charge Filter Apex| Specialized Jett 143
1996(?) Giant Iguana 630|Specialized Riva
Saving for the next one...