I run my 650l 100% on road. I'm gonna (try to .. heh!) figure out what is the widest tire I can fit on the back withour scrubbing the swing arm? Any suggestions? Or just for the curiosity if you run dual or street, what do you run (tire wise and sizes?) I'v been runnin the avon roadrunner (model - AM21)110/90/18 (w/ metzler tubes)on the rear of my xr650l. Am going to switch to the Bridgestone BT45 on the rear, and keep the avon AM21 RoadRunner 21" on the front. (it's nice & sticky( I just cant afford to go to 17"s yet..