My tw would do 70 mph but that was about it. A great bike for sand and mud. I now have its cousin, an xt200, lighter, more suspension, same engine. The TW was better in the thick sand, there is a lot of that here, with whoops and holes that prevents high speed. The TW did not mind, the XT sure does. The XT is a bit more motorcycle like though, loft the front wheel over things, the TW wheels stay on the ground and do not slide.