To my mind, toe overlap is epic fail; it just shouldn't be a thing that's tolerated. Aside from messing with low-speed turns, it really interferes with track-standing at the lights. Lucky for me I only get it on bikes that are too small for me.

But for women, kids and shorter guys, I reckon the situation blows. 650C front wheels should totally be a thing on smaller bikes. I don't think 11t is the answer for gearing, either - if you want 11t on 700C, where are you on 650C? And it makes the gaps between gears unnecessarily wide anyway.

Another reason for smaller front wheels aside from toe overlap is crazy-short head tubes, which are hard on the headset and frame, and get to a minimum length and then leave the stack height potentially too high for smaller riders wanting an aggressive position.