sb11 I tried the 406 x 1-1/8 Stelvios on my stock DT FS rims (marked Dino 20 x 1.5/1.75). To get the Stelvios on, I had to use 200 psi to seat the rim, then deflate to 120 psi. The 20 x 1-1/8 seems to have a smaller lumen diameter than the decimal fraction tires for ISO 406. I checked with a few bike techs I trust before trying the 200 psi trick. I decided that if I flatted on the road, I would never be able to reseat the bead, so I exchanged the Stelvios (thank you, Calhoun Cycle) for Primo Kevlar Comets, 406 x 1.35. I can't tell the difference between the two, but I like being able to remount the tire when on the road ( ) and the Kevlar. (Haven't flatted yet, but it's a matter of time. I have to ride on some disgusting shoulders.)