Joined: Aug 2008
Posts: 13,140
Likes: 2,162
From: Ann Arbor, MI
Bikes: 15 Kinesis Racelight 4S, 76 Motebecane Gran Jubilée, 17 Dedacciai Gladiatore2, 12 Breezer Venturi, 09 Dahon Mariner, 12 Mercier Nano, 95 DeKerf Team SL, 19 Tern Rally, 21 Breezer Doppler Cafe+, 19 T-Lab X3, 91 Serotta CII, 23 3T Strada
Color me daft, but what is the nature of this 'axle/butt' problem? What's the dynamic? I've never thought of it in a meaningful way, or as an important measure.
Based on my own experience, shorter wheelbases 'buck' a little more over big bumps than longer wheelbases, but in terms of negative impact on performance, I don't have any associations there, aside from feeling shorter wheelbases feel more sporty.
And this from a guy who rides a mini-velo and a folding bike, where my butt is not only way out over the axle, but the whole wheel!