Slam bars are 28" wide so if you did not cut them it would be hard to do an Xup or barspins. You may also need to adjust the angle of the bars sometimes that would effect it. The last thing would be that you need to change the way you ride and have your body further back when you do these tricks. When I barspin my body is basicly centered over my seat so the bars wont hit me. By the way Slam bars are very good bars to ride dirt with they are nice and strong and I personally trust S&M alot.