Tire pressure
Super Member
Joined: May 2010
Posts: 829
Likes: 190
2017 C43
It depends on a lot of things... what you see on the door and gas lid are really just recommended pressures. Try playing around with it, till you get to what you are comfortable with while taking into consideration tire brand, wheel construction, suspension (even stock), climate, load, the roads you take and your driving habits.
i'm on 20's, cast wheels, h&r springs, 245/30f 275/30r continental dws, in CA. I found the best pressures for me are 38f/36r (cold). Haven't cracked a rim yet (thank god). None of my passengers have complained about the ride. And still very responsive taking corners. The highest that its gone this summer is 42f 39r, after driving around. This works for me, but i'm sure under normal circumstances it won't vary much, maybe just a pound or two.
Hope this helps.
i'm on 20's, cast wheels, h&r springs, 245/30f 275/30r continental dws, in CA. I found the best pressures for me are 38f/36r (cold). Haven't cracked a rim yet (thank god). None of my passengers have complained about the ride. And still very responsive taking corners. The highest that its gone this summer is 42f 39r, after driving around. This works for me, but i'm sure under normal circumstances it won't vary much, maybe just a pound or two.
Hope this helps.
It depends on a lot of things... what you see on the door and gas lid are really just recommended pressures. Try playing around with it, till you get to what you are comfortable with while taking into consideration tire brand, wheel construction, suspension (even stock), climate, load, the roads you take and your driving habits.
i'm on 20's, cast wheels, h&r springs, 245/30f 275/30r continental dws, in CA. I found the best pressures for me are 38f/36r (cold). Haven't cracked a rim yet (thank god). None of my passengers have complained about the ride. And still very responsive taking corners. The highest that its gone this summer is 42f 39r, after driving around. This works for me, but i'm sure under normal circumstances it won't vary much, maybe just a pound or two.
Hope this helps.
i'm on 20's, cast wheels, h&r springs, 245/30f 275/30r continental dws, in CA. I found the best pressures for me are 38f/36r (cold). Haven't cracked a rim yet (thank god). None of my passengers have complained about the ride. And still very responsive taking corners. The highest that its gone this summer is 42f 39r, after driving around. This works for me, but i'm sure under normal circumstances it won't vary much, maybe just a pound or two.
Hope this helps.
Think it's perfect and so far the tires are wearing really nice.
I'd go for 40 (hot) all around and adjust to your liking from there.
Junior Member
Joined: May 2017
Posts: 44
Likes: 2
2017c43amg
I expirmented a bit myself and found similar results as above. 36/33 is what is recommended but I think it's for easy driving. Driving aggressively I was rolling too far on sidewalls. I checked with chalk. I settled on 38/37 cold. I went a bit higher in the rear than needed so I could induce a slight oversteer. Feels a bit more fun. I m coming from a mustang and miss the loose rear end.
this is on non run flat summer tires.
this is on non run flat summer tires.
Last edited by Al.B.43; Jul 22, 2017 at 09:01 AM.
Junior Member
Joined: Jul 2017
Posts: 29
Likes: 1
W205 C450
running the p-zero run flats on 19s - i'm doing 36 cold, which gets to 39/40 hot. wonder if i should bump em up a bit?
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actually think it was about right for that set-up.
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Senior Member
Joined: Jun 2016
Posts: 307
Likes: 27
From: USA
2017 C43 sedan
After the dealer replaced one of my 19" RFTs all mine were also,inflated to 42. Will ask my SA if that is the new recommended pressure m
Junior Member
Joined: May 2017
Posts: 44
Likes: 2
2017c43amg
Don't trust tha dealer sets it correctly. The gas cap is the pressure you should fill. My sedan says 36f 33r. That's fine for easy driving. I drive a bit aggressive and hit corners fast. I was getting sidewall rollover. I settled on 38/36. All pressure cold first thing in the morning. I experimented with chalk to see how much sidewall rollover I was getting.
Senior Member
Joined: Jun 2016
Posts: 307
Likes: 27
From: USA
2017 C43 sedan
Don't trust tha dealer sets it correctly. The gas cap is the pressure you should fill. My sedan says 36f 33r. That's fine for easy driving. I drive a bit aggressive and hit corners fast. I was getting sidewall rollover. I settled on 38/36. All pressure cold first thing in the morning. I experimented with chalk to see how much sidewall rollover I was getting.
BTW - gas cap is not always authoritative. Always good to check inside the driver's door frame.
