225/50-16 seem to fit on a 7in rim and your selection is better. Rotation is 836/mile. We ran the Kumho ASX when we drove the 98 Z3 2.8 in C Class and did fairly well. You’ve got lots of options…
Here’s some links to the TireRack tests for AS tires in this size: http://www.tirerackwholesale.com/tires/tests/chartDisplay.jsp?ttid=150 http://www.tirerackwholesale.com/tires/tests/chartDisplay.jsp?ttid=119