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RADBMX.CO.UK  |  Technical & Reference Section  |  Tech and Restoration  |  Expert / Pro frame TT sizes?
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Offline ED209

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Expert / Pro frame TT sizes?
« 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  :)
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Offline Devilock

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Re: Expert / Pro frame TT sizes?
« Reply #1 on: January 20, 2015, 08:01 AM »
17.5"...??
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Offline insectbones

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Re: Expert / Pro frame TT sizes?
« Reply #2 on: January 20, 2015, 08:21 AM »
Curtis Expert and Pro frames are 18.5 and 19.5 respectively if thats any help  :daumenhoch:
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Offline Jon The Bassist

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Re: Expert / Pro frame TT sizes?
« Reply #3 on: January 20, 2015, 08:28 AM »
My Hutch Pro was 19.5. and my little bros Expert was 18.5.
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Offline Devilock

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Re: Expert / Pro frame TT sizes?
« Reply #4 on: January 20, 2015, 09:56 AM »
A standard TA is 18.5 & that's not an expert.
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Offline CustardLips

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Re: Expert / Pro frame TT sizes?
« Reply #5 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.  ???
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Offline That Swan Guy

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Re: Expert / Pro frame TT sizes?
« Reply #6 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"
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Offline That Swan Guy

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Re: Expert / Pro frame TT sizes?
« Reply #7 on: January 20, 2015, 10:39 AM »
CW did their own thing depending on year and model.
 :LolLolLolLol:
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Offline ED209

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Re: Expert / Pro frame TT sizes?
« Reply #8 on: January 20, 2015, 11:02 AM »
thanks fellas ....  :angel:

good science  :daumenhoch:
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Offline brummie

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Re: Expert / Pro frame TT sizes?
« Reply #9 on: January 20, 2015, 12:08 PM »
ta 18.5
taxl 19.5
hutch expert 18.5
hutch pro racer 19.5
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Offline ED209

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Re: Expert / Pro frame TT sizes?
« Reply #10 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:
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Offline Spen69

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Re: Expert / Pro frame TT sizes?
« Reply #11 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:
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Offline dinglem

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Re: Expert / Pro frame TT sizes?
« Reply #12 on: January 20, 2015, 01:38 PM »
Birmingham WHEELS Intermediate/Expert was 18.5inch, the Pro being 19.5inch (Mini being 17.5).
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Offline BADDH

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Re: Expert / Pro frame TT sizes?
« Reply #13 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
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Offline animal

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Re: Expert / Pro frame TT sizes?
« Reply #14 on: January 20, 2015, 08:33 PM »
MRD are :-

Expert 18"
Pro 19"
XL-Pro 20" 1/4 (massive  :shocked: )


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Offline OrgasmDonor

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Re: Expert / Pro frame TT sizes?
« Reply #15 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.
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Offline Mikku

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Re: Expert / Pro frame TT sizes?
« Reply #16 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: 
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Offline Andy68

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Re: Expert / Pro frame TT sizes?
« Reply #17 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  :-*
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