i use the slicks for road riding once in a while. i'm running the Panaracer Pasela's 1.25 and they're stinking light. superfast tires compared to running a semislick (which i do occasionally on the rear). i don't find it too troublesome to mount the slicks on. just takes 5 minutes. and my bike looks really funny w/ the slicks on. the 1.25" is pretty much the same width as my rim. (but they save so much weight!! sub21lbs!!!)
