As some of you may have already seen from other posts I've put on here previously, I'm seriously considering getting hold of some new wheels for my S3 next month. I've got my heart set on some 9.5J Rota Grid Drifts in Steel Grey, specs below that I've been reccomended to get by Rota themselves: - 18" x 9.5J - ET 23 - 225/40 tyres They've said to compare the offset of these to my current wheels, to work out what size spacers I may (or may not) need, and to work out how I should fit the wheels in general. Forgive me for seeming being really stupid, but all this wheel stuff really isn't my strong point, I have absolutely no idea how to do this. I currently run Audi RSTTs in 18", which are obviously the wheels that I need to compare against. I currently run these with 10mm spacers on the front, and 16mm on the rear, but the wheels still nowhere near fill the arches - another thing I really do want to achieve! I've already had the front arches rolled in advance to cover this. All in all, the questions I really need answering are... - Will the Rotas even fit at all in the above size? - What size spacers will I ideally need to be running to fill out the arches properly? (If the wheels will even fit) I understand if no one can help with this, but I just can't seem to get my head around wheels and setting them up. Thanks!