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Technical & Reference Section => Tech and Restoration => Topic started by: ED209 on January 20, 2015, 07:49 AM

Title: Expert / Pro frame TT sizes?
Post by: ED209 on January 20, 2015, 07:49 AM: whats the usual difference in Expert and Pro TT frame sizes?

eg. if a Pro XL frame is 19.5 ... what would an Expert frame be?

roughly :)
Title: Re: Expert / Pro frame TT sizes?
Post by: Devilock on January 20, 2015, 08:01 AM: 17.5"...??
Title: Re: Expert / Pro frame TT sizes?
Post by: insectbones on January 20, 2015, 08:21 AM: Curtis Expert and Pro frames are 18.5 and 19.5 respectively if thats any help :daumenhoch:
Title: Re: Expert / Pro frame TT sizes?
Post by: Jon The Bassist on January 20, 2015, 08:28 AM: My Hutch Pro was 19.5. and my little bros Expert was 18.5.
Title: Re: Expert / Pro frame TT sizes?
Post by: Devilock on January 20, 2015, 09:56 AM: A standard TA is 18.5 & that's not an expert.
Title: Re: Expert / Pro frame TT sizes?
Post by: CustardLips on January 20, 2015, 10:24 AM: I have an 88 Elf which is 19.5... was told it's an expert. :daumenhoch:
Whether that's right or wrong i don't know. ???
Title: Re: Expert / Pro frame TT sizes?
Post by: That Swan Guy on January 20, 2015, 10:38 AM: Late 84-86 GT Pro 18.5"
GT Expert (i think) was 17.5"
Dannyrobo may know as he had a chrome one a couple of years ago.

MRD Expert 18.5"
Title: Re: Expert / Pro frame TT sizes?
Post by: That Swan Guy on January 20, 2015, 10:39 AM: CW did their own thing depending on year and model.
:LolLolLolLol:
Title: Re: Expert / Pro frame TT sizes?
Post by: ED209 on January 20, 2015, 11:02 AM: thanks fellas .... :angel:

good science :daumenhoch:
Title: Re: Expert / Pro frame TT sizes?
Post by: brummie on January 20, 2015, 12:08 PM: ta 18.5
taxl 19.5
hutch expert 18.5
hutch pro racer 19.5
Title: Re: Expert / Pro frame TT sizes?
Post by: ED209 on January 20, 2015, 12:17 PM: Quote from: brummie on January 20, 2015, 12:08 PM
ta 18.5
taxl 19.5
hutch expert 18.5
hutch pro racer 19.5

nice one Dave :angel:
Title: Re: Expert / Pro frame TT sizes?
Post by: Spen69 on January 20, 2015, 12:58 PM: Same with MRD Ed, the expert was 18.5" and the Pro 19.5" - they did special XXL frames for Tim I believe that were getting on for 21" but Animal would have to confirm :daumenhoch:

Standard Mongoose and Supergoose tt length was 18.5" from the late 70's to the late 80's but I have no idea after that as I have no interest after about '84 / 85 frames until newschool :-\

I'd go 18.5" & 19.5" as your answer roughly :coolsmiley:
Title: Re: Expert / Pro frame TT sizes?
Post by: dinglem on January 20, 2015, 01:38 PM: Birmingham WHEELS Intermediate/Expert was 18.5inch, the Pro being 19.5inch (Mini being 17.5).
Title: Re: Expert / Pro frame TT sizes?
Post by: BADDH on January 20, 2015, 07:13 PM: Yup Robbo along the same sizes around 1" difference.

The GT Pro geometry fools the Tape dims though lol
Title: Re: Expert / Pro frame TT sizes?
Post by: animal on January 20, 2015, 08:33 PM: MRD are :-

Expert 18"
Pro 19"
XL-Pro 20" 1/4 (massive :shocked: )
Title: Re: Expert / Pro frame TT sizes?
Post by: OrgasmDonor on January 20, 2015, 11:54 PM: due to difference in seat tube angles, BB to top of h/tube is probably where the biggest difference is.
Title: Re: Expert / Pro frame TT sizes?
Post by: Mikku on January 21, 2015, 04:09 AM: 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:
Title: Re: Expert / Pro frame TT sizes?
Post by: Andy68 on January 21, 2015, 03:29 PM: 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 :-*