I'm a touring clydesdale I have done 100000 miles with 165 to 190 pounds on the rear wheel. Kevlar tires last 5 times as long as non Kevlar tires if the failure mode is glass cuts. There are 2 main types of these tires. There is the belt or fabric mesh under the thread used by most makers. There is also the chopped fiber used by Performance Geax brands. There is no reason why the 2 technologies can't be combined for a super tough tire. It's been my observation that tires 1.5 inch or 38 mm wide or less fail due to glass cuts. Tires wider than this fail from ripping at the bead. What we need if you want to run wider tires is an extra 2 plies. Attempts have been made to do this. Specialized Armadillo have have an extra 2 plies of flat plies. These tires were used by the Romp Family on their quad on their cross country trip. Details can be found on archive.org The problem with these tires is the rubber does not stick well to the flat plies and the tires delaminate. Continental has a light weight extra 2 plies called gator skins. The problem with these tires is the polyamide thread they use has a greater tendency to tear at the bead. We simply need to tell manufactures we want a tougher tire. They are making spokes for us now.