right i have 1 or 2 sets of wheels knocking about that i could do with getting rid of now

i have no idea what et they are as none are marked

how do you work this out?

i know about theback space and all that its just where you measure the wheel width from

as i have searched and some sites say outer lip and some say where tyre bead sits

(later being what i thought)

anyone clear this us for me please