I bought a 2004 V-Strom a couple weeks ago, put on new tires, changed oil etc. I'm not sure if this is normal or if I did something wrong, but when I'm riding, and I shake the back wheel at like, 30mph, it feels almost like the back tire is sliding around a little bit. Also it does it on the highway when I ride over a long groove in the road. I'm not sure if this is normal and I'm just over thinking it, or something else is wrong. I think my back breaks are slightly rubbing aswell. Another situation that happened was I was riding and slammed on my breaks, and it almost felt like the back wheel was sliding around a bit. At first I thought I locked up the breaks, but I don't think I did. Any ideas?