Tire Pressure Guidance
Newbie
Joined: Feb 2025
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2016 C300 Luxury 4Matic
2016 C300 PRESSURE WITHOUT RUNFLATS?
Greetings,
Bought my first Benz and learning about it is worse than Grad School.
Info: 2016 C300 Luxury 4matic. Came with Michenlin Defender T+H 225 x 50 x 17, NOT RUN FLATS
Door sticker pressure: 39 PSI front 45 PSI rear
Fuel door sticker: 32 PSI front, 32 PSI rear
Question: What pressures are correct?
Note: The tire pressure indicator is way off and needs to be reset, but that's another story.
Thanks
Bought my first Benz and learning about it is worse than Grad School.
Info: 2016 C300 Luxury 4matic. Came with Michenlin Defender T+H 225 x 50 x 17, NOT RUN FLATS
Door sticker pressure: 39 PSI front 45 PSI rear
Fuel door sticker: 32 PSI front, 32 PSI rear
Question: What pressures are correct?
Note: The tire pressure indicator is way off and needs to be reset, but that's another story.
Thanks
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,173
Likes: 431
S600
But tire pressure is not a single number !!
32 PSI is as low as one would want and is likely the point of maximum ride quality versus tire wear.
35 PSI allows one ½ year between thinking about tire pressures.
39 PSI is as high as one would want and is likely the point of maximum traction, low tire wear, and gets 10% more mileage on gas.
I run 39 PSI, check them once a season (or TPM goes off) and average 20 MPG in an S-600.
I can feel the traction differences and ride quality differences quite easily. Some tires (like run craps) want less pressure to lessen the harshness of the run craps; while I like the faster response time of the higher pressures.
Member
Joined: Nov 2019
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From: Colorado
2015 S550 4Matic, 2014 ML550
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The fuel door sticker is more correct.
But tire pressure is not a single number !!
32 PSI is as low as one would want and is likely the point of maximum ride quality versus tire wear.
35 PSI allows one ½ year between thinking about tire pressures.
39 PSI is as high as one would want and is likely the point of maximum traction, low tire wear, and gets 10% more mileage on gas.
I run 39 PSI, check them once a season (or TPM goes off) and average 20 MPG in an S-600.
I can feel the traction differences and ride quality differences quite easily. Some tires (like run craps) want less pressure to lessen the harshness of the run craps; while I like the faster response time of the higher pressures.
But tire pressure is not a single number !!
32 PSI is as low as one would want and is likely the point of maximum ride quality versus tire wear.
35 PSI allows one ½ year between thinking about tire pressures.
39 PSI is as high as one would want and is likely the point of maximum traction, low tire wear, and gets 10% more mileage on gas.
I run 39 PSI, check them once a season (or TPM goes off) and average 20 MPG in an S-600.
I can feel the traction differences and ride quality differences quite easily. Some tires (like run craps) want less pressure to lessen the harshness of the run craps; while I like the faster response time of the higher pressures.
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MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,173
Likes: 431
S600
The fuel door sticker is more correct.
But tire pressure is not a single number !!
32 PSI is as low as one would want and is likely the point of maximum ride quality versus tire wear.
35 PSI allows one ½ year between thinking about tire pressures.
39 PSI is as high as one would want and is likely the point of maximum traction, low tire wear, and gets 10% more mileage on gas.
I run 39 PSI, check them once a season (or TPM goes off) and average 20 MPG in an S-600.
I can feel the traction differences and ride quality differences quite easily. Some tires (like run craps) want less pressure to lessen the harshness of the run craps; while I like the faster response time of the higher pressures.
But tire pressure is not a single number !!
32 PSI is as low as one would want and is likely the point of maximum ride quality versus tire wear.
35 PSI allows one ½ year between thinking about tire pressures.
39 PSI is as high as one would want and is likely the point of maximum traction, low tire wear, and gets 10% more mileage on gas.
I run 39 PSI, check them once a season (or TPM goes off) and average 20 MPG in an S-600.
I can feel the traction differences and ride quality differences quite easily. Some tires (like run craps) want less pressure to lessen the harshness of the run craps; while I like the faster response time of the higher pressures.
That is why I run higher pressures in street driving than in race track driving--so that the tire pressures are "about the same" when street driving and when track driving--giving the car essentially the same feel at the steering wheel, gas pedal, and brake pedal. Porsche drivers do similarly as noted above by another contribuor.
The deal with tire pressures, and suspension alignments, and corner weighting is that you want the contact patch evenly loaded across the whole foot print. An unevenly loaded contact patch creates wear that can be avoided.
Camber is used to evenly load the inside edge with the outside edge,
Tire pressure is used to make the center equal to the inside and outside edges.
Toe is used to equalize front to rear contact pressures (via temperature).
My book(s) on tire setup use 50 pages to fully cover the topic(s).
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,173
Likes: 431
S600
Only if the tire temperature remains in the "window".
Tires that are too cold do not provide all the grip available--these slid over the road surface like a pencil eraser slides over paper.
Tires that are too hot do not provide all the grip that is available--these slid over the road surface as if the surface has grease on it.
F1 cars in the 1970 ran 13 PSI and weighed 600 Kg, current F1 cars at 800Kg run 21-24 PSI mandated by the tire supplier (different for each race track), because if they ran lower pressures, the tire construction will fail at the heavy loads the ground effect cars generate. Current F1 cars would be a second faster using tire pressure the teams want to use. See British GP about 3-4 years ago when there were multiple tire failures near the end of the race.
So does Ferrari 35 PSI for street driving, 42 PSI for driving at speeds over 150 MPH for significant amounts of time. {{And I suspect McLaren, Bugatti, Porsche, Lamborghini}}
Tires that are too cold do not provide all the grip available--these slid over the road surface like a pencil eraser slides over paper.
Tires that are too hot do not provide all the grip that is available--these slid over the road surface as if the surface has grease on it.
Check F1 they only run mid 20PSI (cars are lighter for sure) but about getting more rubber to touch tarmac...Pirelli does imply a minimum pressure so the tires will cope with the high speed.
This is why MB says to raise pressure for super high-speed driving - to reduce chances of tire from over-heating and hence blow outs.
MBWorld Fanatic!
Joined: Nov 2014
Posts: 4,242
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From: Chicago burbs
2015 S550
Adding a note:: On a race track the tire will want a temperature close to 200ºF, which raises the tire pressure by 6-8 PSI compared to 50ºF sitting in your garage.
That is why I run higher pressures in street driving than in race track driving--so that the tire pressures are "about the same" when street driving and when track driving--giving the car essentially the same feel at the steering wheel, gas pedal, and brake pedal. Porsche drivers do similarly as noted above by another contribuor.
The deal with tire pressures, and suspension alignments, and corner weighting is that you want the contact patch evenly loaded across the whole foot print. An unevenly loaded contact patch creates wear that can be avoided.
Camber is used to evenly load the inside edge with the outside edge,
Tire pressure is used to make the center equal to the inside and outside edges.
Toe is used to equalize front to rear contact pressures (via temperature).
My book(s) on tire setup use 50 pages to fully cover the topic(s).
That is why I run higher pressures in street driving than in race track driving--so that the tire pressures are "about the same" when street driving and when track driving--giving the car essentially the same feel at the steering wheel, gas pedal, and brake pedal. Porsche drivers do similarly as noted above by another contribuor.
The deal with tire pressures, and suspension alignments, and corner weighting is that you want the contact patch evenly loaded across the whole foot print. An unevenly loaded contact patch creates wear that can be avoided.
Camber is used to evenly load the inside edge with the outside edge,
Tire pressure is used to make the center equal to the inside and outside edges.
Toe is used to equalize front to rear contact pressures (via temperature).
My book(s) on tire setup use 50 pages to fully cover the topic(s).
Member
Joined: Feb 2023
Posts: 223
Likes: 111
Wow, so the door jamb info is for full load. That graphic in post #5 is quite handy!
I’m in a 2019 S560 rental with the tires at 43-44 hot, and frankly… let’s just say I’m glad I found this thread.
I’m in a 2019 S560 rental with the tires at 43-44 hot, and frankly… let’s just say I’m glad I found this thread.
Last edited by Quietride; Jul 7, 2025 at 06:13 PM.
MBWorld Fanatic!
Joined: Oct 2019
Posts: 5,158
Likes: 1,770
From: Colorado
G550
I never carry heavy loads or trailer hitch weight, so don't need extra rear tire pressure. It's usually just the 2 front seats that are occupied. I keep all 4 tires inflated equally at 38 psi and measure the treadwear monthly. My vehicles (G550 and X7) are AWD and there's a lot of chatter about drive train component sensitivity to even small tire diameter differences.
