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Did you run a 25c tyre on your T3?
I'm currently on a true 24 at the back, I've had a "23" in there which was actually 25mm wide. Xav has probably tried everything and knows the numbers, but I doubt that you can detect the tyre width in aero as long as it's on a matching wheel. The seat tube is 29mm wide, so anything less than that is hiding.
Obviously the fatter tyre will roll better, whether on road or track.
gbj_tester
damskodonny
Did you run a 25c tyre on your T3? If so, due to rolling resistance on the road? Or is there perhaps a sophistocated aero gain..?