"Stupid Question" What is the right tire pressure? - Mercedes-Benz Forum
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#1 (permalink) Old 12-03-2007, 04:19 PM
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"Stupid Question" What is the right tire pressure?

Hello all! This may seem like a stupid question, but I have to ask.I have an E-55 with 18's on it. The tire sidewall says "51 PSI max inflation". Are you supposed to inflate to the max? If not, what is the basic formulation (50% of max, 60% of max?). I have always filled mine within 5 Psi of max.Anyone have any idea what standard practice is? Thanks for any help! Brian
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#2 (permalink) Old 12-03-2007, 04:25 PM
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Hey, heretic, welcome to the forum.

I generally apply the useful knowledge of whatever the owners' manual says. For my non-AMG variant there are two different specs depending on whether you'll be driving sustained high speeds.

It's also if I'm not mistaken the inside of the fuel door.

The only time I would deviate from that would be if I noticed unusual tire wear (center wearing faster, over-inflated, edges wearing faster, under-inflated).

So long as you have the proper-spec tires (particularly for minimum load rating) you can safely adopt the logic of the MB engineers when they designed your car and use the manual's recommendations.

Take care and enjoy the ride,
Greg

Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy; its inherent virtue is the equal sharing of misery. (Winston Churchill)
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#3 (permalink) Old 12-03-2007, 04:26 PM
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Originally Posted by Heretic E55 View Post
Hello all! This may seem like a stupid question, but I have to ask.I have an E-55 with 18's on it. The tire sidewall says "51 PSI max inflation". Are you supposed to inflate to the max? If not, what is the basic formulation (50% of max, 60% of max?). I have always filled mine within 5 Psi of max.Anyone have any idea what standard practice is? Thanks for any help! Brian
Look inside your fuel door. The infomation is in there. I set my @ 34psi front /37psi rear.

It doesn't matter what size wheel you have, air pressure is the same inside regardless of size.
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#4 (permalink) Old 12-03-2007, 06:02 PM
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Thanks for the replies. Thanks for the warm "welcomes" too! The tires on the car are not the original equipment. Does this make a difference in regards to what it says in the owners manual or door panel? I guess my question should be: How much air should you put into a tire that reads " 51 psi max inflation"? Or is it more relevant to use the owners manual guidelines even if the tires are not original equipment?Thanks again, Brian
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#5 (permalink) Old 12-03-2007, 06:24 PM
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Check the psi tire chart in the fuel door location; check your owners manual.

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#6 (permalink) Old 12-03-2007, 06:26 PM
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I always run 34-35 front, and 30-32 rear for maximum traction, 37 is too high IMO and you will be sacrificing grip. hope that helps.
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#7 (permalink) Old 12-03-2007, 09:08 PM
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Originally Posted by Heretic E55 View Post
Thanks for the replies. Thanks for the warm "welcomes" too! The tires on the car are not the original equipment. Does this make a difference in regards to what it says in the owners manual or door panel? I guess my question should be: How much air should you put into a tire that reads " 51 psi max inflation"? Or is it more relevant to use the owners manual guidelines even if the tires are not original equipment?Thanks again, Brian
\

The "51 psi max inflation" is just that: the absolute maximum that should ever be in that tire for safety purposes. "max" has NOTHING to do do with what should actually be put in the tires under practically all driving situations.

'87 300E: sold after 11years @ 230k & still on the road somewhere in rural Tennessee.

'94 C220 with 93k totalled 10/06 by hit & run broadsiding monster truck: not a scratch or bruise for me
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#8 (permalink) Old 12-03-2007, 09:18 PM
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The fuel door specs recommend 32 psi front, and 33 psi rear. I run mine at 33 psi front, and 34 psi rear. The latter seems to be the perfect compromise between traction and roll resistance.

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#9 (permalink) Old 12-03-2007, 10:07 PM
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I definately need to let a little air out then. Thanks for all the good feedback. Regards, Brian
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#10 (permalink) Old 11-02-2010, 12:01 PM
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reviving old thread. My apologies.

seems like confusing information coming from sticker attached on the driver
side door jamb. 48 psi (rear) 41 psi (front)
Which is correct? door jamb label or fuel filler door label.

see pic: door jamb.



Additionally, I'm using Michelin Pilot Sport all around.

Last edited by E55mocha; 11-02-2010 at 12:04 PM. Reason: added tire brand.
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