Clydesdales/Athenas (200+ lb / 91+ kg) - Can't seem to keep my knees in - weight related problem or just my anatomy?

For some reason I can't keep my knees in when I ride. Those who've ridden behind me have all said I ride like I'm on a horse - bow-legged. Is this a clyde issue, poor posture on the bike or just my anatomy? The extra drag is contributing to my slow speed (that's my story and I'm sticking to it).

Hm, my first guess is that your seat may be too low. Your legs should be nearly extended when they're at the bottom of the pedal stroke. I imagine my legs would bow a bit if my seat was low. Other than that, it may just be the general fit of your bike or your anatomy. You could go to a shop and get fit for it, see what they have to say.

I have the same problem, even after a professional bike fit. I think it's mostly size related. I'm not sure how big you are, but I'm about 305 lbs., and my legs are huge. They don't stay in when sitting in a chair, and the bike is no different. Especially on the bike, the belly has to go somewhere (sort of between the legs) and the thighs keep your legs pushed apart. I do find my posture getting better as I lose weight.

You should still check seat height and all the other factors, but it may not be fully corrected until you lose weight.

I've noticed the same problem. Kinda makes me mad 'cause I used to have a sweet stroke. Not my fat gut gets in the way and I must consciously pull my knees in and spin round. Never used to need to think about it. Oh well time will fix it.

if you are fitted properly, don't worry about it! my knees naturally swing out when I pedal and i tried "forcing" myself to ride with my knees in and all I did was cause myslf to have sore knees. :)