Does anyone know? I've searched, and I've asked with no replies! and it's largely a fruitless effort so over to the committee!..
Very early ones too BMX style 25.4 post however mine is bigger than that. Not big enough to take a standard mk2 26.8. I expected it was 26.4 but wanted to confirm or not...I've just been in the loft and grabbed the sawn off post off my 1992 GT (26.4)? And that looks too wide, though it swallowed the 26.0 Kalloy off my racer project. Argh. So could be a generous 25.8 or even a 26.2!?!?
Help, one of you know this am sure....!
Seat clamp. I'm reckoning 28.6 ish. The 29.6 off the Gt is a bit big