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A 275 width tire will fit on a 8.5" rim but with that et27 offset it "may" not fit up front. A test fit would be needed. The OEM wheel is 18x7.5 et24 and with the upgrade to 20x8.5 et27 rims you lose 16mm of clearance on the inside. That may be a very close fit.

The upcoming 300C SRT-8 will use these sizes on soon to be build Goodyear Eagle F1 Supercar tires on a 20x9" rim:

245/45/20 front
255/45/20 rear
 

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300c Owner said:
Like the tire / wheel package ... BUT would like wider tires front and rear.

I find my 300c rear wheels slipping on a regular basis and the ESP attempts to kick in. My gut tells me that the ESP and engine torque are likely fighting each other at some point.

Ideally, 275 upfront and 305 rear ... At least 275 rear.

Any chance you will be able to confirm if this combo will support 275?
What tire is giving you rear slippage? I hope you are not referring to the stock rubber? If So, surely you did not expect any real performance or sticky grip from the OEM Continental which is a touring tire designed for high miles, comfort and less noise? :confused:

If you upgrade to 275 front and 305 rear it is purely by personal choice and not a necessity for performance as you are stating. There are plenty of high performance cars on the market with much more HP and torque that does not need anything wider than 245 front and 275 rear, namely every AMG car and some with 604 HP and 738 ft lbs like the CL65 AMG with a conservative 0-60 time of 4.2 seconds.

 

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There is nothing wrong with being direct and to the point and backing it up with some real usable information is helpful to everyone. Regardless of the Drag Racing analogy, which will not help select a proper tire for a 300C, no one should expect Maximum Performance traction and grip from a narrow OEM touring tire. :D
 
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