Alan Holmes wrote:

My son had the wheels stolen off his bike and I'm trying to find
replacements, if I measure the diam of the brake ring will this help?

When you say brake ring do you mean the position of the pads on the
rim?

If yes, then measuring that will give you a rough idea of the ERTRO
size of the wheel.

622 mm is 700C
559 mm is 26" mountain bike.

--
Phil Cook looking north over the park to the "Westminster Gasworks"