I was riding one of these on the street and developed a nasty creak somewhere. Entire bike was stripped down and inspected at the shop and we could not figure out what it was. Ended up cannibalizing it and threw the the wheels, bottom bracket and crank on a Felt frame that I bought. BB looked great according to the mechanic, and I get no creaks at all in this frame. Fork and seatpost were also checked for possible cracks and nothing was found. I think it had a bad weld in the bottom bracket area and decided that with my weight that the frame was now questionable.