racetech, would be a good idea, but then need to find people that are running these setups to test wheels on

and then some wheels might fit over the brakes and others of the same size might not so its a bit hard to say exactly what will fit. could probably have a guess as to what would fit

13s would fit over most 250mm disc setups
14s probably 270mm
15s 290mm

and so on. but it also depends on the disc offset and what caliper you are using and stuff