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76 Eldorado Conv 2001 STS
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12 Posts
Discussion Starter · #1 ·
Just fitted some 18inchers with Goodyear Eagle F1 235/50/ZR18 rubber on my 2001 sts.
What tire pressure do you guys think I sould be running at.
 

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1999 White Diamond STS
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218 Posts
The GS-D3's? Man, I really, really wanted those.

Air pressure, under what the Max. pressure is, which on those, is 50psi, so try like 40psi and go from there.
 

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'93 STS (sold), now looking for a CTS Wagon soon!!
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503 Posts
Rule is, the vehicle determines the air pressure......
I have 18" Bridgstones, and the Max pressure shown on the sidewall is 50, the actual pressure is 35.

50 will make it feel like you are on steel wheels w/ no rubber, if they are a lower profile.

Max pressure is just a warning if you need to compensate for a 24' Bayliner hitched on your rear bumper.
And I don't think you are planning on doing that......
 

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76 Eldorado Conv 2001 STS
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12 Posts
Discussion Starter · #5 ·
I was running 30 but it felt like the tire would come off the rim when cornering, I've got 40 in at the moment bit that feels a bit harsh. Sounds like 35 is where I sould be at.
 
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