When I went down a few weeks ago my bike slid on the NRC cover,bottom side of the bar end,bobbin on back of the swing arm, the middle of the side body where it pertrudes out the farthest(used to pertrude out the fathest). The NRC cover did a good job keeping oil off the track and protecting my motor.Not sure exactly how fast but was in the middle of a 4th gear roll-on. If the bike did'nt hit the grass and flop,I'd been able to hop right back on.