Proper tire pressures 2018 AMG GTC roadster with steel brakes

Old May 12, 2025 | 09:55 AM
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Proper tire pressures 2018 AMG GTC roadster with steel brakes

Hello
looking to get the right info for a non track weekend spirited drive through the hills and hollers of the Ozark mountains
I am on new Continental extreme contact sport 02
many thanks
shaq
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Old May 12, 2025 | 11:41 AM
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Originally Posted by pilota1
Hello
looking to get the right info for a non track weekend spirited drive through the hills and hollers of the Ozark mountains
I am on new Continental extreme contact sport 02
many thanks
shaq
check your fuel door. Itll give you the appropriate tire pressure based on load and speed
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Old May 13, 2025 | 09:36 AM
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so reading this in the inside of Dohr jam of the car 38 psi all around. Any other thoughts or experience?
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Old May 13, 2025 | 09:44 AM
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Originally Posted by pilota1

so reading this in the inside of Dohr jam of the car 38 psi all around. Any other thoughts or experience?
not the door jam. Open up the fuel cap as if you were pumping gas and follow the sticker there. Itll give you different options depending on load and speed.
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Old May 13, 2025 | 07:44 PM
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Originally Posted by pilota1
https://cimg1.ibsrv.net/gimg/www.mbworld.org-vbulletin/1297x975/img_2805_e6b115b2da5d5d9e09492d939d4ed021d961f8ad. jpeg
so reading this in the inside of Dohr jam of the car 38 psi all around. Any other thoughts or experience?
As mentioned by another forum member, it is the pressures shown on the fuel door. I think only MB puts additional tire pressures on the fuel door? Minimal and Max load as well as autobahn speed pressures.

Last edited by W205C43PFL; May 13, 2025 at 07:46 PM.
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Old May 14, 2025 | 03:51 AM
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ford
not the door jam. Open up the fuel cap as if you were pumping gas and follow the sticker there. Itll give you different options depending on load and speed.
You made it easy for me, Thank you.
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Old May 14, 2025 | 06:47 AM
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Thanks all
looks like 31 all around for sub 150 mph single occupant based on the fuel door sticker
tires were indeed over inflated. By the shop when replaced
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Old May 14, 2025 | 02:25 PM
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Originally Posted by pilota1
Thanks all
looks like 31 all around for sub 150 mph single occupant based on the fuel door sticker
tires were indeed over inflated. By the shop when replaced
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Old May 15, 2025 | 04:38 PM
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Old May 15, 2025 | 04:41 PM
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Originally Posted by sevenhead
Thanks for that thanks for posting.
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Old May 16, 2025 | 05:23 AM
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Old May 16, 2025 | 09:57 AM
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Originally Posted by sevenhead
My absolute pleasure.
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Old May 16, 2025 | 06:02 PM
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I noticed the top two don’t show the 19/20 setup. So I run 35# at all four corners.
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Old May 16, 2025 | 06:30 PM
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Originally Posted by ///Bruce
I noticed the top two don’t show the 19/20 setup. So I run 35# at all four corners.
As long as you balance it well, that is good.
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Old May 17, 2025 | 06:07 AM
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Originally Posted by ///Bruce
I noticed the top two don’t show the 19/20 setup. So I run 35# at all four corners.
That is assumed that you are running the OEM PSC2 as delivered from the factory.
This photo is from my 2018 GT R.

Last edited by sevenhead; May 17, 2025 at 06:10 AM.
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Old May 17, 2025 | 08:31 AM
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Originally Posted by ///Bruce
I noticed the top two don’t show the 19/20 setup. So I run 35# at all four corners.
The top two rows refer to summer tires in a 19"/20" front/rear setup and are intended for (Y)-rated tires.
The bottom two rows apply to winter or M+S tires, which are typically W-rated and suitable for speeds up to 168 mph.

Generally, any pressure between 31 and 38 PSI is acceptable, depending on your top speed and driving style. For spirited driving, 35 PSI on all four corners is my choice as well for OEM/Michelin PSS/4S type tires.

Last edited by G. P; May 17, 2025 at 08:33 AM.
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Old May 19, 2025 | 07:26 AM
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Thanks to all here is response from continental tire

Had a wonderful spirited drive yesterday tire pressure set at 31 all 4 tires
car did well pressure got up to 35 outside temp was 75 degrees just me and a 28 gauge shotgun

this am got a response from Continental Tire which surprised me

Thank you for contacting Customer Relations at Continental Tire the Americas.
The cold inflation pressure is set by the vehicle manufacturer and applies to replacement tires of the same size. So, we recommend following the pressure listed on the vehicles tire placard. According to the Tire Guide, this is 36 PSI front and 39 PSI rear.

thoughts ?
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Old May 19, 2025 | 11:30 AM
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Originally Posted by pilota1
Had a wonderful spirited drive yesterday tire pressure set at 31 all 4 tires
car did well pressure got up to 35 outside temp was 75 degrees just me and a 28 gauge shotgun

this am got a response from Continental Tire which surprised me

Thank you for contacting Customer Relations at Continental Tire the Americas.
The cold inflation pressure is set by the vehicle manufacturer and applies to replacement tires of the same size. So, we recommend following the pressure listed on the vehicles tire placard. According to the Tire Guide, this is 36 PSI front and 39 PSI rear.

thoughts ?
I wouldn’t try and overthink this; just follow the recommendations found on the inside of the fuel flap regardless of the brand of tyre. Meaning: if you aren’t travel fully loaded at speeds greater than 155 mph, set your psi to 31 at all 4 corners.

As an aside: I used to use 29 psi on the Sport Cup 2 tyres on my ‘18 GTR as it helped greatly in providing a little more compliance on surface streets; all without any obvious deleterious issues.
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Old May 19, 2025 | 02:13 PM
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Yes exactly, use the fuel cap pressure not the tire manufacturer's recommendations, MB designed the vehicle for the best balance of sport and comfort with the pressures shown on the cap, lots of testing and engineering was done, although you do go 1 up or 1 down a psi depending on your personal preference.
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