Hi, I need new summer tyres for 56 E320CDI Estate. Current tyres are 245 45 ZR17 99Y. I have the following questions: 1. When I search by registration number the size is 225 45 R17. Has the previous owner put modified wheels or is it a standard set up? 2. Load rating: should it be 95 0r 99? (I read somewhere that higher load rating might adversely affect handling? 3. What is the best brand/model of tyres for this car? (I am currently leaning towards CONTINENTAL 245/45R17 99Y ContiSportContact 5 4. What are "MO" tyres? The above tyre is actually cheaper in MO specification. Why would Mercedes approved version would be cheaper than the standard generic of CONTINENTAL 245/45R17 99Y ContiSportContact 5 (about £122 vs £129). Is it better to get generic rather than MO version of the tyre? 5. Thinking of getting them from http://www.tyresonthedrive.com as they come and fit at home. Are they ok? Many thanks for the advice.