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Right...............I'm not an authority on these things, but;You don't want to confuse wheelbase with TT length. Also, you don't want to assume that lengthening the front end by sticking a xxl stem on it will make it the same as a longer TT frame.Moley; your old bike must have one lazy-assed seat tube angle yeah? and your more modern bike has a more conventional steeper seat tube. This explains the difference in the position of your BB shells. Assuming of course that you're measuring frames only and not frame and forks, coz if you were, then you'd have to start looking at headtube angles as well and that's far too much work... My point being, TT length is not a myth these days as most all seat tube angles are very very similar. You're not gonna see 2-3 inches of difference in anything nowadays, so the TT length is very relevant now.The most fundamental difference I've noticed is the longer the TT the 'flatter' the bike jumps. It always seemed to me that the longer bikes fly nicer, less likely to loop out or nosedive. A very short frame with a bloody great long stem on it wouldn't give this effect. Might just be me though..
Whats the difference with Flatland bikes?Shorter back ends for spinning etc, etc!!!