Just a quick question. Why do some modern TT frames have rear facing drop outs, a bit like a track frame. And why do some not have a gear hanger? Is there some sort of adaptor you can get for fitting the rear mech?
"All frames are fitted with horizontal drop outs and allow any wheel or tire to be perfectly positioned in the seattube cut-out, thereby minimising the clearance between tyre and frame. Because the smaller the clearance, the lower the air turbulence. In addition, the clearance between tire and frame which is required by the UCI (the thickness of a credit card) can be adjusted without any tools using knurled bolts."
That's right, the wheel spacing wouldn't be right.
No, someone has bought a TT frame on another forum and was asking questions, and also, I went to watch the Paris/Nice TT a few weeks back and noticed alot of the TT bikes had track style drop outs and wondered why. I asked a HTC mechanic who was preparing bikes and his answer sounded like bullsh t so I wanted to get to the bottom of it.