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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 8:31 am 
Retro Guru
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Joined: Sun Aug 01, 2010 1:04 pm
Posts: 2500
Location: West Sussex
Forks probably best get on here. They are going for such crazy money on ebay (even basic ones)
its cheaper to buy a whole bike just for the forks at the mo.


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 8:52 am 
Old School Grand Master
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Joined: Tue Oct 19, 2010 9:55 am
Posts: 7058
Location: The land of Lea & Perrins
If you're going for a hardtail, then they're measured centre to centre, as others have said.

Their full suspension frames are a different story though. I've got an STS which is a GT 18", but it measures 20.5" centre to top, and 16.5" centre to centre :?

Image


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 12:15 pm 
Retro Guru
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Joined: Mon Feb 07, 2011 1:14 am
Posts: 1871
Location: Kuranda DH circa 1991
i am 190cm there abouts.

i have ridden 20" 19" 18" and beleive it or not 14" (it was a mates slalom bike just for fun )

i would suggest 19 or 20, perhaps 20 preferably.

GT's have really short top tubes. at the end of the day...thats the more critical dimension than a seat tube.

The other problem...with the 19 they tend to have tiny head tubes. ie the same as a 18. what this means, is that if you ride a decent amount of seatpost (and if you are 6' 2" that is likely), then the drop to the bars is large. in turn, this means sore neck...from trying to look up the trail.

Sure, you could run lots of spacers and steep stems and risers bars....but man....that is just not a nice look. In fact you see it on lots of GT's...where folks clearly find the front end way too low.

Solution.....20" frame. by comparison, they have gigantic head tubes , which puts the stem and a good height, and you can run a nice decent length 0 degree and flat bars and still be really comfortable.

The links below in my sig describe this a little. The 95 is a 19 and perhaps slightly too small for me really. it had a fair bit of seatpost hanging out, and had quite a lot of drop to the bars.

The 94 is ideal. imho anyhow. Not huge amounts of post hanging out, a 140 0 degree stem minimal spacers and moderate drop from saddle to bars. This bike feels really good to ride.

The 92 is the same frame size, however the stem is a little less ideal, and long term, i also want a 0 degree 140 cattleprod for it (anyone? anyone?). the stem on it is a 150 flip flip, however when flipped its actually closer to 155... too long! and also dumped too much. However when it is in its upright position, equally it puts the bars way too high, and makes it hard to climb steep hills.


Last edited by merckx on Tue Apr 16, 2013 12:25 pm, edited 1 time in total.

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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 12:20 pm 
Old School Hero
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Joined: Thu Apr 30, 2009 5:07 pm
Posts: 225
Great advice merckx thank you ; )


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 12:26 pm 
Retro Guru
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Joined: Mon Feb 07, 2011 1:14 am
Posts: 1871
Location: Kuranda DH circa 1991
no probs...i just updated also a little to talk about my three bikes and their slightly different setups


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 12:38 pm 
Old School Hero
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Joined: Thu Apr 30, 2009 5:07 pm
Posts: 225
Great. I used to have a dark grey Avalanche Alu 20" from about the same era as your 94. (I remember it was the first year the RTS-1 was made) A great bike...but was stolen ; (


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 12:41 pm 
Retro Guru
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Joined: Mon Feb 07, 2011 1:14 am
Posts: 1871
Location: Kuranda DH circa 1991
i remember the colour yes. my first was in 93, a green steel borrego w suntour and a Mag 21 fork i bought for it separately. it served me well for years and i really quite loved it. it was a 20".

what are you thinking of looking for this time round?


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 12:45 pm 
Old School Hero
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Joined: Thu Apr 30, 2009 5:07 pm
Posts: 225
Psyclone, avalanche or similar in a 20"


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 7:22 pm 
Retro Guru

Joined: Thu Sep 01, 2011 5:11 pm
Posts: 1043
Location: Left Coast of Canada
merckx wrote:
i am 190cm there abouts.

i have ridden 20" 19" 18" and beleive it or not 14" (it was a mates slalom bike just for fun )

i would suggest 19 or 20, perhaps 20 preferably.

GT's have really short top tubes. at the end of the day...thats the more critical dimension than a seat tube.

The other problem...with the 19 they tend to have tiny head tubes. ie the same as a 18. what this means, is that if you ride a decent amount of seatpost (and if you are 6' 2" that is likely), then the drop to the bars is large. in turn, this means sore neck...from trying to look up the trail.

Sure, you could run lots of spacers and steep stems and risers bars....but man....that is just not a nice look. In fact you see it on lots of GT's...where folks clearly find the front end way too low.

Solution.....20" frame. by comparison, they have gigantic head tubes , which puts the stem and a good height, and you can run a nice decent length 0 degree and flat bars and still be really comfortable.

The links below in my sig describe this a little. The 95 is a 19 and perhaps slightly too small for me really. it had a fair bit of seatpost hanging out, and had quite a lot of drop to the bars.

The 94 is ideal. imho anyhow. Not huge amounts of post hanging out, a 140 0 degree stem minimal spacers and moderate drop from saddle to bars. This bike feels really good to ride.

The 92 is the same frame size, however the stem is a little less ideal, and long term, i also want a 0 degree 140 cattleprod for it (anyone? anyone?). the stem on it is a 150 flip flip, however when flipped its actually closer to 155... too long! and also dumped too much. However when it is in its upright position, equally it puts the bars way too high, and makes it hard to climb steep hills.


:cry:

Oh well, I guess I'm just going to have to build it up and see how it fits. Fortunately I do have a couple of longer stems and a riser bar in the parts box that I can use to stretch it out and lift it up if need be. I hope it fits - wife will kill me if I bought something that doesn't fit.


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 Post subject: Re: GT sizing...
PostPosted: Tue Apr 16, 2013 7:37 pm 
Retro Guru

Joined: Sun Jun 19, 2011 9:44 pm
Posts: 1934
Location: wirral
philth wrote:
Great. I used to have a dark grey Avalanche Alu 20" from about the same era as your 94I remember it was the first year the RTS-1 was made (


rts was available as a frame set in 93, the serial on mine has a 92xxx in it.

oh am 6'0/6'1 and mine is a 18"


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