What an amazing invention! This chair has no problem traversing over bumps in the road, gravel, etc. - in fact, it actually seems to ride better on the rough spots than on a smooth surface. I had a chance to try it out yesterday. If you know someone in the Marin County area who is bound to a wheel chair, I highly recommend they give it a whirl while Don Swenson, the West Coast rep, is in town. He leaves on Friday.