Technical & Reference Section > Tech and Restoration

Expert / Pro frame TT sizes?

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OrgasmDonor:
due to difference in seat tube angles, BB to top of h/tube is probably where the biggest difference is.

Mikku:
That's a good point!

I also get the impression that tt lengths increased (and therefore the designation of "expert" and "pro" models changed) through the 80s, with many of the early-mid 80s classics (GTs, Skyway T/As, Laserlites, etc) being around the 18.5-mark, and longer versions coming thereafter. Thank god for laybacks! :daumenhoch: 

Andy68:
Im assuming we're all measuring from centre of seat tube to centre of head tube?  :daumenhoch:

GT Expert is 17", same as the junior.... just saying  :-*

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