Join Date: Oct 2002
Location: Annandale, New Jersey
Bikes: 2014 Surly Steamroller, 1989 Nishiki Altron
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You're 6' tall, a 15"-16" frame is way too small. Riding a bike that is too big or too small can be bad for your knees. Try at 17 or a 17.5.
Being a fellow 6' tall person, unless that frame is DJ geometry which is designed to be small, which this gt isn't, it's a xc bike. For example, my kona is a medium and it is a 15.5 but measures out to be a 17.5, My Rocky Mountain Vertex is a 17.5. Wrenchscience has screwed up measurements before, best way to get an accurate measurement is to go to a bikeshop to have them fit you for a bike in person.