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Drag radials -- how much size difference will the car tolerate

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Old Apr 27, 2017 | 01:54 PM
  #1  
tscales's Avatar
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From: Oldsmar, FL
2005 E55 Wagon, 2017 C63S Cab, 1986 560SL
Drag radials -- how much size difference will the car tolerate

I took my C63S drag racing last night. Did well, but 20" run flats aren't the best tires.

The stock tires are 285-30/20.

Looking at Mickey Thompson, Hoosier, and Nitto (all that I know), the closest are the +/- 1/2 inch in diameter (some are +/- 0.8 in).

Can the computer accept up to 0.8 diameter variation?

What about width?

Stock tires are 11.2" width. (My is a convertible).

What's the max width in both wheel and tire I can handle in the wheel well?

The Mickey Thompson E/T Street SS in 305/35-19 tempt me

0.5" smaller diameter.
0.8" wider in width.

Feels OK. I searched and didn't find that much.

Thanks!
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Old Apr 27, 2017 | 04:28 PM
  #2  
RDOCA's Avatar
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From: SoCal
2016 C63S Sedan
Originally Posted by tscales
I took my C63S drag racing last night. Did well, but 20" run flats aren't the best tires.

The stock tires are 285-30/20.

Looking at Mickey Thompson, Hoosier, and Nitto (all that I know), the closest are the +/- 1/2 inch in diameter (some are +/- 0.8 in).

Can the computer accept up to 0.8 diameter variation?

What about width?

Stock tires are 11.2" width. (My is a convertible).

What's the max width in both wheel and tire I can handle in the wheel well?

The Mickey Thompson E/T Street SS in 305/35-19 tempt me

0.5" smaller diameter.
0.8" wider in width.

Feels OK. I searched and didn't find that much.

Thanks!
They don't come with run flats.
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Old Apr 27, 2017 | 07:31 PM
  #3  
tscales's Avatar
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From: Oldsmar, FL
2005 E55 Wagon, 2017 C63S Cab, 1986 560SL
Interesting. I was told by the dealer that they are run flats. Regardless, the question still stands
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Old Apr 27, 2017 | 07:43 PM
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From: Houston
19 E63s
the coupes are so new people haven't started stuffing wider / larger tires. Need guinea pigs!
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