Originally Posted by freetors

I've been running the 38mm GK slick on my bike for nearly 1000 miles now and honestly I can't believe some of the crap it's survived. I've ridden it on tons of gravel, a lot of it sharp, and a bunch of chunky roads with rocks embedded in the surface and I've only experienced one puncture so far that sealed up almost immediately. I think that's pretty darn impressive for a tire that is thinner and lighter than a dedicated road tire like a 28mm GP5k.I weigh about 175 and run them between 30-45 psi depending on conditions. To me, the only downsides to the slick is that 38 is the largest size available and they get pretty drifty on looser surfaces. Also they are so floppy that on my wheels it's impossible to get the beads to seat without using a tube first or preseating them with tire levers.