Challenge P-R 27s on about anything are tough the first time, but they seem to stretch with age.
I did sell off one wheel/tire set on a flip bike just to get rid of them - I knew I didn't want to fix them roadside.
DuraAce 7700, Shimano's first gen paired spoke offering, with some variety of Michelin ProRace tires on them. My plastic tire "irons" were useless, and instead bent into other shapes. I had to use a screwdriver to replace a tube for the last time before selling, which wasn't exactly nice to the rim.