RepairPal Certified shops can diagnose and repair your 2003 Mercedes-Benz SL500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
If you change the size in any way, yes you will need to have the computers re-set to compensate for the change in tire size. If you stick to the exact stock specifications then no, a re-set is NOT needed.