The stock tires were woefully undersized, IMO, and the Euro models came with larger wheels & tires (IIRC). I'd say a 205/55/16 on a 16x7 wheel is the minimum, and if you could bump up to a 7.5 wheel with 215 width that would be even better. Stock 16" and 17" wheels (7.0-8.0 width) from the W210, 208, 203, and 202 chassis mostly bolt up with no clearance issues... might help with that wheelspin "problem" you now have...