as you all know i'm in the market for a new bike. can someone advise me on seat tube angle. when i ride my bike (lad's you're gonna like this!) i tend to push my arse out what i mean is, i've got quite long legs and i think this makes me push my arse towards the back of the saddle. when i cycled to paris i realised after 150 miles that my arse cheeks were sore because i was sitting over the back of my saddle. the guys adjusted my seat for me and one of the water stops (while i carb loaded on bananas ) which sorted the problem. most road bikes i've looked at the seat tube angle is either 73 or 73.5. What i want to know is, by the time the seat tube gets to the top does this 0.5 make a massive difference? i'm thinking if they shoved my seat back a couple of centimetres and it made all the difference, could the 0.5 in the seat tube angle make a difference of couple of centimetres, or would the difference at the top of the tube be negligable? do you know what i mean?