Tire pressure question
Thread Starter
Junior Member
Joined: May 2020
Posts: 26
Likes: 2
2020 GLS450
Tire pressure question
What psi do you guys keep your tires at? I’ve been having tire issues and control issues and the dealership has set them all at 35 which is not what the information on the door panel says. Just curious what everyone else is doing
Super Member
Joined: Jun 2015
Posts: 630
Likes: 188
C450, GLS 63 and a few other things
At 35 all around, suspect you need a drop more in the front, but see what happens. Not surprised if you are having wear issues. I am surprised you would be having "control" issues with 35 all around when driving on the street at reasonable street speeds. Perhaps an indication of something else wrong.
Senior Member
Joined: Aug 2016
Posts: 435
Likes: 109
From: CA
2021 GLE 450, 2017 GLC 300 4Matic, 2008 FJ Cruiser
When tires are cold you check tire pressure.
Check the Gas filler door normal use regular load recommended tire pressure add 1 to 2 extra psi when cold.
Mine is a GLE have 20 inch all around keep them cold 33 psi.
Junior Member
Joined: Dec 2020
Posts: 48
Likes: 32
2020 GLS 450
I run 32-33 PSI all around on a 2020 GLS 450 with 20 inch wheels. The recommended pressures are displayed inside the fuel door: 31 PSI for normal load and 41 PSI front and 45 PSI rear for maximum load (1246 pounds). My GLS was delivered new with maximum pressure all around (41/45), which I discovered several weeks later. The GLS rides better on "normal" pressure with only a very minor difference in steering response. Other tires and sizes may have different pressure specifications.
There are two additional tire pressure and load tables on the "B" pillar between the front and rear doors, which is a source of confusion. Both list pressures (slightly different) for maximum load only. I had an independent service center and tire dealer both reset the pressure to maximum pressure in accordance with the "B" pillar label. Seeking clarity I contacted my Mercedes service representative and confirmed with Mercedes customer service that owners should use the pressures displayed inside the fuel door. The owner manual states likewise.
There are two additional tire pressure and load tables on the "B" pillar between the front and rear doors, which is a source of confusion. Both list pressures (slightly different) for maximum load only. I had an independent service center and tire dealer both reset the pressure to maximum pressure in accordance with the "B" pillar label. Seeking clarity I contacted my Mercedes service representative and confirmed with Mercedes customer service that owners should use the pressures displayed inside the fuel door. The owner manual states likewise.
Super Member
Joined: Jan 2002
Posts: 560
Likes: 50
From: New York City
Chevrolet Chevette, Ford Pinto, Pontiac Aztek, Trabant, Yugo GV (and all the worst cars ever built)
I drove from New York to Chicago, going through smooth highways and old rough freeways (Indiana toll road). Also drove going there with a full load of kids and returned one less person and her baggage. I tested various PSI ranging from 40 (too hard) and 32 (too mushy) on various roads and scenarios and the best ride for me was a 34 rear and 33 front if not loaded. If loaded I would add another PSI on rear and front. My GLS has 21" Pirelli tires that came OEM.
