Branko_76:
I'm running Super Champion Modele 58's, which are straight-wall. IRC Special Tyres are rated at 85psi, and that's what I inflate them to. These must have been their base model in maybe the late 70's-early80's. I'm just getting back into using 27", last time being 1985. I've been able to find IRC as N.O.S., but these Special Tyres are really heavy. Their Roadlite gumwalls are lighter and Roadtour somewhere in between.