Manufacturer Wheel Off-Set Chart
 

Has anyone compiled one for the various 1/10th electric buggy brands?

Paul Worsley is your man - you should know this - LOL

I've measured the 12mm hex wheels I use/have which are follows:

Rears (mm):

Kyosho: 26.2
Xray 25.6
Proline: 26.9
Schumacher: 27.1
Losi: 27.3

Front (mm)
Xray: 23.33
Kyosho:25.6

That's some mega wide wheels you have there Simon Hart - He said off-set mate

That is the backspace, it's hard to calculate the offset without having to cut the wheel and normally when people ask for the offset they want to compare various wheels with the OEM ones in order to have correct track width. Hopefully this will help.

Actually, thinking about this it's easy to calculate the offset once you have the backspace. Take the Kyosho wheel, most are the same width 38mm wide (rear). I always work with the backspace though.

38mm width - 26.2mm backspace = 11.8. So the offset in this case is 19mm (zero offset) - 11.8 = 7.2mm offset.

Simply do the same for the others.