I am curious on what size offsets you are running for 20" wheels for a scuderia. 20 x 8.5 front (offset) ??? 20 x 12 rear (offset) ???
This information is proprietary for many aftermarket wheel manufacturers so you might not get much of a response. You can always try calling the wheelmaker you're interested in and ask. I have 20" HRE P47s on mine, perfect offset, no rubbing etc. I had novitec race springs in there once upon a time, but took those out because it was way way too bouncy for me: My stance is pretty aggressive imho: http://distilleryimage8.s3.amazonaws.com/f4ca3c9ace2e11e3a7230002c9d03a38_8.jpg
Robert- If the widths are the same as the 19" wheels, offsets should be the same. Offsets are easy to calculate if you just remember they are from the centerline of the wheel width. Make yourself a little drawing, and you can pretty much figure out what you need. For reasonably wider wheels, just try to split the extra width half on the inside and half on the outside. Here are the OEM offsets for the 360 and F430 model family wheels. Any wheel manufacturer of dealer will be happy to quote you any offset information you need. Many manufacturers will make whatever offset you want, within reason. 360 Five Spoke and Modular 18, 5 X 108 mm Front 7.5J X 18 ET 31.5 mm, Rear 10J X 18 ET 38.95 mm 360 Challenge Challenge Monolithic 18, 5 X 108 mm Front 8J X 18 ET 31.5 mm, Rear 10.5J X 18 ET 39.95 mm 360 Challenge Stradale Challenge Monolithic 19, 5 X 108 mm Front 7.5J X 19 ET 31.5 mm, Rear 10J X 19 ET 39 mm F430 Five (Ten) Spoke, Challenge Monolithic, Scuderia Style 19, 5 X 108 mm Front 7.5J X 19 ET 31.5 mm, Rear 10J X 19 ET 39 mm Scuderia/16M 10 Spoke, Five Spoke 19, 5 X 108 mm Front 8J X 19 ET 31.5 mm, Rear 10J X 19 ET 39 mm
a great offset resource -> Wheels and Tires Forum Sponsored by The Tire Rack - E90Post - BMW 3-Series (E90 E92) Forum
