Width on the playstation-3 17mm rim is around 55mm:. 2s inflated to around 35 psi give a really nice rounded profile while still retaining a slightly shallower curve on the top. Mounted on 17mm wide Fulcrum Red Metal Zero rims, the playstation-3 Conti Race King Supersonic 2. You can see how porous the sidewalls are by looking at the small columns of air beads coming out of the tyre.
To see what I mean have at look at this picture of the inflated tyre under water. One playstation-3 thing about light non-UST tyres - you can't rely on them to hold air, at least not without running some sort of sealant. This is probably helped significantly by the Fulcrum's UST rims that have a very nice bead retaining goove. Indeed, when I later test rode them I tried an absurdly playstation-3 low 20psi and I could not get them to come off the bead.