28mm blackwall Paselas on the Mercian and Gitane fixed-gears
35mm Continental Cyclocross Speeds from a few years back on the Raleigh Competition with the Dingle/White Industries Dos Eno fixed/free drivetrain
FWIW, the gearies have a funky mix of whatever was available -
27 x 1 1/4-in blackwall Paselas on the '76 Puch Royal X
20-year-old Continental Sport 1000 28mm on the '82 Mercian Colorado
Continental 23mm Gatorskins on the '88 Specialized Sirrus (because it won't accept anything appreciably bigger!)
25mm IRC something-or-other, bought used at the LBS, on the '88 Centurion LeMans
32mm tanwall Paselas on the Cannondale, destined for the Lighthouse