Toffo, if you'll measure top tube c-c should have something about 22.5 inch. Then it's a 18 in GT size chart for sure. Steerer tube looks too short for a 20' size frame Mikee.
Yes Rad you are correct top tube is indeed 22.5 inches c-c
The ups and dhl websites are useless for pricing, so i am going to ask at the post office how much it will cost and if they can deliver through parcelforce.
Measuring it like this (to centre of top tube) it is 18 inches.
When you measure to where the seat post goes it is 20..confused..you will be.
So i reckon it is an 18 inch frame
selling a GT karakoram on ebay only £25. i cannot post a link yet so you will have to search for it. Blue/purple black paint scheme, all original except pedals. i Think i bought it in 1994 for just shy of £600