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gt owners - newbie asks questions re size...(5 posts)

gt owners - newbie asks questions re size...frost
May 29, 2002 7:11 AM
i am interested in purchasing a used gt road bike so i don't have the benefit of having the help of lbs. i am 5' 9" and would like to know what frame size i need for a gt. i currently ride a 16" gt xizang and it fits great. thanks in advance.
re: gt owners - newbie asks questions re size...tronracer
May 29, 2002 7:34 AM
General rule of thumb is take your inseam and x 2.54 to convert to cm. Then take that # and x .67. Voila, that's your frame size. Go to wrench science for a more accurate measuring system.
GT's run a bit largerGeekRoadie
May 29, 2002 7:42 AM
I've found that the ZR's run a little bit larger than other makes. For example, I've got a 52cm that fits more like a 54cm. Keep this in mind when using the standard formula for determing frame size (to derive C-C or C-T). Which GT were you looking at?

GT's run a bit largerS-U-B
May 29, 2002 7:51 PM
I'm also 5'9" and one of my rides is a GT ZR 2.0. I ride a 56 cm with an 11cm stem. Had professional fitting done, and it fits very well. I am normal as far as leg length and torso length. My other bike is a Look 381i that I ride a 55 cm with a 10 cm stem, so the GT is smaller in comparison. check out for geometry on the newest models.
re: gt owners - newbie asks questions re size...DankFrank
May 30, 2002 11:11 AM
I'm 5' 7.5" and ride a zr-1.0 lotto at 52cm. It fits. So, you'll be a size or two up, try the 54 and 56 on for sizing.

Better yet, just measure your inseam as stated above, and use the formula to calculate it. That's what I did, and the result was a correct fit (once I got stem and seat choices right).