RADBMX.CO.UK

Mid School BMX (>87) 1989 to 2003 (<05) => Mid School ( Keep the faith ) => Topic started by: ~nomad~ on October 24, 2014, 12:31 PM

Title: Headset + Seatpost for GT Pro Series
Post by: ~nomad~ on October 24, 2014, 12:31 PM
Hi guys, just trying to put my GT Proseries back together, and I am a bit stuck with the headset. The 1inch threaded type I have ordered is too small, and a 1 1/8 seems too big.

I am also short a seatpost, does anyone know what size is used?

Any ideas? :)
Title: Re: Headset + Seatpost for GT Pro Series
Post by: That Swan Guy on October 24, 2014, 12:34 PM
What year is it?
Investing in a set of verniers will sort these problems out, they're cheap from good tool shops or even bad tool shops  :LolLolLolLol:
Title: Re: Headset + Seatpost for GT Pro Series
Post by: ~nomad~ on October 24, 2014, 12:38 PM
Its a 92.
Title: Re: Headset + Seatpost for GT Pro Series
Post by: That Swan Guy on October 24, 2014, 12:43 PM
If it's threaded it should be either 1" or 1 1/8" there wasn't any other. Have you tried the bigger one?
Title: Re: Headset + Seatpost for GT Pro Series
Post by: ~nomad~ on October 24, 2014, 12:46 PM
yeah the bigger one is miles out. Verniers say 1 1/4? The seattube is 22.1mm inside measurement. Would that make sense?
Title: Re: Headset + Seatpost for GT Pro Series
Post by: ~nomad~ on October 24, 2014, 12:52 PM
ok, research tells me 1 1/4 threaded headset and 22.2mm seatpost!
Title: Re: Headset + Seatpost for GT Pro Series
Post by: That Swan Guy on October 24, 2014, 12:58 PM
22.2 is normal not heard of 1 1/4"? Curious
Title: Re: Headset + Seatpost for GT Pro Series
Post by: 20to26 on October 24, 2014, 01:32 PM
I think you need 32.5mm diameter headset cups - there are a lot of 1" headsets out there for narrower road bike & mini head tubes that are sold as '1" old school bmx' - but in fact they need shims to fit.
Title: Re: Headset + Seatpost for GT Pro Series
Post by: nosepickben on October 24, 2014, 02:48 PM
Ok, seat post first, a 1992 gt will take 22.2mm post. That is often referred to as a 1" post as the seat tube is 1" outside diameter.
If it has that sized seat tube/seat post, then it will need a 1" threaded headset. 1 and 1/4" is not used for bmx so either the headset you got is " not what it says on the tin " or you've not used enough force to tw4t the cups in!!
SimplePortal 2.3.5 © 2008-2012, SimplePortal