Knees don't bisect top tube
 

(OK, bisect may not be the right word) If I measure the distance from my right knee to the top tube, I get about an inch or so; the same measurement on the left is more than 3 inches. I just noticed this- I imagine I have 100K miles over the last 25 yrs. I dont have any fit problems. Should I care?

Hmmm...

I have enough pants rub on the top tube... I hope my knees don't bisect it!!!!

But, if you're happy with the fit of your bike, then you don't have to make everyone else happy. :innocent:

A smaller frame allows you to set the bars lower. But, that may not make any difference to you. Also, there seems to be a move from riding in the drops to riding on the hoods (and lowering the bars to compensate). Again, only important if it affects you.

:commute::giver::commute::backpedal:

If in all those miles you are not suffering any discomfort then I would not be concerned. I had a similar problem where the right knee would sometimes brush the top tube, The right knee also experiences occasional discomfort. I ended up shiming the foot bed under the arch and installing a 1 degree shim under the cleat. This all had the effect of physically shoving the knee out. It no longer brushes the top tube although I very occasionally get some discomfort When that happens, I step up knee exercises and the discomfort stops.

Everyone is physically asymmetric to some degree or other. Interesting that it took you this long to notice, but since it doesn’t cause any discomfort or affect your cycling I suspect you can continue to ignore it for another 25 years. My right knee comes closer to the top tube then my left as well. Doesn’t bother me either.

Happy cycling!

Most likely the left leg is longer, causing it to flair out more. Perhaps a shim/spacer in the right shoe, with a slightly higher saddle would get you a little more symmetrical.