Hi. I have an '03 2.4 A4 and am looking to upgrade the stock rims to bigger ones.

What is the recommended setup for 18" wheels in terms of sizes. On my BMW the recommended setup is 8" wide rims on the front and 8.5" rims on the rear. Is there a similar "staggered" setup on the A4?

The manual does not give any information. Thanks in advance.