18in GT frame for a 5ft 7 1/2 Munchkin?

Hiya!
I've recently discovered that I'm a couple of inches shorter than I always believed and so my 19 inch Hardrock (and obviously my 20 inch Kraken) are too big for me.
I'm a novice so didn't really notice as I've never had anything to compare with and have yet to hit a proper track / route.
I'm on the lookout for a 17inch frame but just wondered -to those who know specific bike's geometry- whether the 18 inch 2009 GT Aggressor frame sitting in my garage will fit me?
I could build it up and see, but tbh I still wouldn't know and don't want to suffer the scorn of my lbs (at least until I've got a bit of cash to spend there).
Any advice appreciated, Happy New Year.
I've recently discovered that I'm a couple of inches shorter than I always believed and so my 19 inch Hardrock (and obviously my 20 inch Kraken) are too big for me.
I'm a novice so didn't really notice as I've never had anything to compare with and have yet to hit a proper track / route.
I'm on the lookout for a 17inch frame but just wondered -to those who know specific bike's geometry- whether the 18 inch 2009 GT Aggressor frame sitting in my garage will fit me?
I could build it up and see, but tbh I still wouldn't know and don't want to suffer the scorn of my lbs (at least until I've got a bit of cash to spend there).
Any advice appreciated, Happy New Year.
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Fair enough, I'll have to pop to the shop and have a look - that looks to be the only way. Both bikes fit, insofar as I can sit fairly comfortably and ride them, but I have only been on road / light trail so the issues with riding an oversized bike have not cropped up - that's why mine haven't felt too big, which a 20 inch surely must be.
Sorry if it seems a bit vague, I'm only just getting the hang of cycling again and am still sitting and riding a bike in the same way as I did when I had a bmx as a kid.
The reason for the 3 bikes in 3 sizes is I bought the 19in HardRock as a basic way into biking and thought it would fit my 5ft 9in (so I thought) frame, the Kraken was bought for the price of 2 new tyres (which it had on and I needed) and the GT frame was next to nothing with a Marzzochi Bomber still on it - both parts donors really.
So, I'll use the lbs and keep my eye out for a smaller frame.
Cheers for the advice
Ahh OK, there may be hope then. I'll look it up and learn a bit about top tube lengths. Thanks very much for the help Rockmonkey
Nah, everyone guesses their height and then trusts the sizing chart, no need to test a bike for size :roll:
:P
seanoconn
As a rule of thumb, as you are about 3.5" below an average height, a medium sized frame would seem a bit large?
retired 9.6kg Carrera Kraken
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Cheers, I'll have to sit on a few to see. In spite of some of the more sarcastic replies, I did try out my spesh and Kraken before I bought them, but as I had no idea about proper riding position and I didn't fall off, they seemed fine and I bought them.
It's only now I want to ride it 'properly' that I have seen the issue.
It looks like you're right and I may need to go even smaller as I have wandered down to the lbs today and did some browsing and had a chat with the fellas.
I know there's no strict rules, but if you feel just about right on a 16", that's got to be a good guide that anything above 17 is right out for me for a start.
Thanks again for your help, HNY