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I have tried a few different pressures and ended up with 31 psi at cold temps (very cold outside = about 35F). They heat up to about 35-37 after running a bit.
 

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05 maggied CTS-V, 2017 NSX Whoo Hoo!
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I started at 36, thought it was to high and went to 31.
After the tires got "scrubbed in" I went back to 35 and it feels a heck of a lot better then it did at 31-32.
All temps are measaured cold.
Tires are 255-45-18
Car still doesn't quite feel as "solid" as it did with the stiffer sidwall of the runflat, but from what info I gathered that is the price one pays.
The increase in size has made the steering a lot more sensitive also.
 

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2017 Camaro ZL1; 2011 CTS-V sedan; 2004 Lightning
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I second 35 psi cold all around (245/45 front, 275/40 rear). Feels good for daily driving. You may need to reduce this some in hot summer temperatures, though, or risk going above 42 psi when they warm up.
 

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no one mentioned noise. Is there a difference in noise compared to the runflats?
 

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lawfive said:
I second 35 psi cold all around (245/45 front, 275/40 rear). Feels good for daily driving. You may need to reduce this some in hot summer temperatures, though, or risk going above 42 psi when they warm up.
Can you post pics of your car with the 275s in the rear, please!

I am thinking of going that route as well but just want to see the rear wheel gap
 
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I'm glad I read this today as mine are 28-32 depends on temp outside. I have noticed that they will spin very easy though. I can only go about 1/8 of the way with the gas pedal our they will spin, but I also have 427RWHP and that has alot to do with it:bouncy:
 

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lawfive said:
I second 35 psi cold all around (245/45 front, 275/40 rear). Feels good for daily driving. You may need to reduce this some in hot summer temperatures, though, or risk going above 42 psi when they warm up.
I 3rd this.
 

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Mutlu said:
Can you post pics of your car with the 275s in the rear, please!

I am thinking of going that route as well but just want to see the rear wheel gap
I saw these live for the first time this past So-Cal V-meet and I can say that the rim-widening on the 275s looks GREAT; much better than just mounting those on the stock rims.

Bigfoot did a good job here... :D
 
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