[M6-Coupe]

Originally Posted by Crazyfist

So I need some input on tires. Ive always driven trucks and this is my first car. BMW 650i. I have these wheels currently: http://www.shopbmwusa.com/PRODUCT/35...L-AND-TIRE-SET
They have terrible tires on them Dunlop run flats. Ive looked at 2 different tires - Pilot super sports and continental extremecontact DWS 06.

Currently on the front I have 245/35R/20 and 275/30R/20. Why are they 35s on the front and 30s on the rear?

Your front rims are 8.5" wide and the rear ones are 9" wide so basically your rear tires must be wider than the front ones. On the other hand the total height of your wheels (for 650i) must be almost the same and that's why your front tires have larger aspect ratio compare to rear ones (35% vs 30%).


The PSS I can put 245/35ZR/20 on the front and either 285/30ZR/20 or 285/35ZR/20 on the rear. (They dont have a 275) Will the 285s fit?

The widest tire recommended for 9" rims is 275 mm.

The other CONTINENTAL EXTREMECONTACT DWS 06 is rated very high by everyone and comes in the same sizes I have now.

What would you do?

I don't recommend CONTINENTAL EXTREMECONTACT DWS 06 since it's very hard compound tire (UTQG 540)... you better chose a softer compound like MPSS or BRIDGESTON (non RFT)

^^^