Why? Different grades of alloy? I can polish it to make it shiney just been sitting around for a while. So what is the 190mm and 180mm used for ? Different year boxes?
I'm not being funny if it reads that way. Genuine question as I've never used mine?
Today I fitted new rear wheel studs, new rear pads, checked the handbrake on the rear calipers, new rear drop links and fitted my new alloys. (Thank you zazee for these).