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Aesthetics are the only thing differenting medium and the large - since the reach is 12mm longer on the large, easily compensated by a 12mm shorter stem.
So do you like the look of bike with extra seat post showing and longer stem, or normal seat post show and the rounding edge of the drop bar parked behind the front hub in a vertical line - I prefer the first "trackish" look and the extra weight distribution on the front wheel, being the front end parked closer under you as a consequence of the shorter TT.
Im looking to buy a canyon slx 7.0 and Im wavering between buying a medium and a large. I currently ride a 57 track frame with a 55.5 top tube and 90mm stem. Im worried the medium canyon will mean I'm relying on masses of seatpost and the large will be too long? alot of money to drop on a bike thats the wrong size. Can anyone help?