This bike was the second bought from bikesdirect.com Since they are continually tearing up the streets which is hard on my lighter bikes. This Gravity fat bike just rolls over potholes and such. The only changes to this bike made were cables, front and rear derailure, 9 speed grip shifter and recon cassette, hydraulic brakes, handle bars and stem, seat post and seat, and the best one Veerubber 3.5 speedster tires. Also DT Swiss comp spokes and brass nipples. Adapting my single wheel trailer was a little work. This is now an excellent town bike and grocery getter