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91 420 SEL
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264 Posts
Discussion Starter · #1 ·
on the gas cap i think it says like 26.... but thats way to low the tires show wear on the outter edge from under inflation.. i have them set to 32... and the seem alright .. but what doest everyone have theirs set at.. i have the stock wheels with 205/65 sooo stock tires as well...
 

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Black 560 SEC AMG, White 560 SEC Carat (RIP 09) , 300E
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1,296 Posts
that's funny on my gas cap it says front 32 and rear 34...unless you carry a heavy load...maybe it's different the 420 compared to 560...
 

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W124 400E, W126 500SE
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971 Posts
I'm in europe, my cap says 2.2bar on the front and 2.3 on the rear - the tires look deflated, but hey - it's a heavy car and they knew what they were doing :) it's supposed to be soft, not hard...

Side wear is normal, it's because of declination of the wheel when turning.
 

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'87 420SEL '89 300E
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44 Posts
The sticker on my cap has three settings, two for summer and one for winter.

Summer normal front 29 PSI, Summer normal rear 30 PSI
Summer maximum front 30 PSI, Summer maximum rear 35 PSI
Winter front 33 PSI, Winter rear 38 PSI

Warm tires: +7 PSI
For driving more than 100MPH: +9 PSI

I run mine year round at 30 PSI in the front and 33 PSI in the rear, and I don't have any in irregular tire wear issuses.
 

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91 420 SEL
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264 Posts
Discussion Starter · #5 ·
well so far like i said the 32 seems alright.. ill see how it goes after i put some mileage on them
 

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1985 500 SEC, 2005 E320
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1,294 Posts
32 front, 34 rear is what I use. perfect wear on 225/55/16's
 

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1991 300SE
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1,435 Posts
Remember guys. The tire pressure amount stated on the gas door is for OEM tires. (whatever brand/size/models came on the car from Mercedes.) I'm sure that all of us have some other brand on our cars by now. It all boils down to the type of rubber used by a manufacturer and side wall strength, blah, blah. Two tires from two companies with the exact size dimensions will probably have different pressure ratings.

A good rule of thumb is to put about 6-8 psi less than the stated maximum allowed for your tires. This allows for tempurature variance and road conditions. Too little air in the tires puts major strain on the sidewalls.

BTW, I'm running 38psi on tires with a maximum of 44psi. Very smooth. And I rotate 'em every 5K. :)
 
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