I asked about this before and didn't get an answer. I burn through more than a set of knobbies a year and since I ride just gravel/dirt/paved roads I don't need the traction but would like a tire that lasts longer. I found this set on Ebay, like the price and the fact they will fit my stock wheels. 4 ply is better than the 2 ply stockers. Anyone ever run these or anything close, I'm mostly interested in how long they last.