My Rotator Pursuit is a dual 406 with a light front end and I have used 4 Comet Primos and 2 Stelvios in 15kmi of riding. I use the Stelvios in the front only (~25mm width) and the Comets in the rear (~28mm or so wide) with kevlar banding on the Comets. I get usually 4kmi+ from the rear Comets but the the first Stelvio, on the front, had a side wall ripout at the bead after perhaps 3kmi. Tread was still very good as to be expected from a front tire. Lost one Comet (kevlar belt!?) when I ran over a square headed bolt and punched a nice rectangular hole through the entire tread/belt/carcass and tube. Makes me wonder about whether there is kevlar and Kevlar(TM).