Originally Posted by
smd4
Veloflex makes the Master 20. 20 mm and fairly cheap. I'll have to pick up a set myself.
Veloflex tires
I'm not sure exactly when it happened, but many tire manufacturers have "adjusted" their tire sizes to accommodate the greater widths of modern rims. I've had a number that ended up a couple of mm smaller than the marked size when mounted on a vintage rim.
One example is the Veloflex Corsa Evo (formerly known as the Master)... I bought some 25mm versions and mounted them on some Mavic MA-2. These ended up measuring closer to 23mm.
I've seen this on some Continental models too, although their sizing between models hasn't been consistent.
My point... some new 23mm tires may work to replace a 20mm tire on vintage rims, although it would be work to find out which ones would do it.
Steve in Peoria