- Joined
- Dec 27, 2020
- Messages
- 311
Actually correct.
CHECK YOUR TIRE PRESSURE!
- Thread starter JHZR2
- Start date
My favorite time to drive a car: just after an oil change or just after setting inflation pressures all-around correctly. Car is SO stable at that point, it nearly drives itself. This "effect" is true in my BMW, Mini and Honda, like autopilot. Pressure drifts from this in a week to 10 days, so I check 'em again. Costco makes it stupid simple. With 5K mile OCI's and tire rotations, all my cars max out their tread life even across the tread. At a little over 50% wear, if there is any uneveness in wear from center to side, indicating over or under inflation, I adjust a pound either way to compensate for the remainder of the tread life so wear is even at the end. Currently running Michelin Pilot Sport 4 on the 335i, Pirelli Cinturato P7 Summer on the Cooper S & Pirelli Cinturato P7C2 Summer on my Accord. Wish I could get the Cinturato C3 and or the Pzero PZ5 in my sizes. Perhaps by the time I'm due for tires I will be able to get those. CHECK YOUR SPARE TIRE INFLATION PREASURE. : ) TIRES: They largely determine the personality of your car!
SammyChevelleTypeS3
$50 site donor 2023
LoL! Thanks for saying it. I had already been corrected by the internet and auto/tire web pages. I DID mention that many times when I am FULL of Myself about autos (just 50 yrs experience) I wind up getting put in my place. We NEVER really know too much. Always some more to learn. I am open to that. So , THANKS again. I KNOW the burst pressure is way up there. Just did not realize that certain things could actually rise the pressures as much as 3-5 psi. Yup! Put in my place AGAIN. I do not mind. I thank all who share their knowledge. It is a great way to learn. I worked with some older mechanics who COULD not / WOULD not ever admit a mistake or a correction. Those are tough to deal with.
CleanSump
Site Donor 2026
- Joined
- Dec 27, 2020
- Messages
- 311
Comfort pressures, not longevity, handling, breaking, fuel economy optimisation. Talk to any tyre company tech representative
Perhaps some people might want to prioritise comfort. I'm one of them but my tyres are never underinflated for the load or for the speed. I run comfort pressures around town and highway pressures on longer trips.
CleanSump
Site Donor 2026
Uh, that's not what you said and unless you can show an MB placard, I am correct. You did not say "comfort pressures" you stateda "all". Done with this silliness.
OVERKILL
$100 Site Donor 2021
The placard pressure is a balance of desired characteristics (caveat: with the shipping rubber, different tires will change these characteristics somewhat) for handling, turn-in, over/understeer behaviour, braking, and comfort. There is no universal "right" pressure, which should be obvious with even a modicum of critical thought applied based on factors like tire size, curb weight, sidewall profile...etc.
The OEM will of course prioritize certain characteristics depending on the intended usage profile of the vehicle. The usage profile envisaged by SRT for my Jeep for example would have focused on performance-oriented driving, which is also why it has 295's on all 4 corners. It specs 33psi.
No, MB is just very precise. My door sticker looks just like that, but there is another sticker in the fuel filler door that calls for pressures much higher than the door sticker.
Of course, the one in the fuel door is for heavy loads or very high speed driving, but hey, at least they try to tell you.
SammyChevelleTypeS3
$50 site donor 2023
Tire pressures do need to be monitored if someone wants to get the most bang for the bucks. Lots of folks never even look at their tires etc.... I check tire psi and pop the hood to check all fluids about 2-3 times a month. The tires of today, the radials are so much better / improved products than we had years ago. The only thing I do not like is how they will always look under pressured.
OVERKILL
$100 Site Donor 2021
My M5 had two sets of pressures:
1. US/Canada pressures, which were "universal" and just "max vehicle weight limit": 44F/48R
2. Outside US/Canada pressures, which were more nuanced:
- Max vehicle weight limit: 44F/48R
- Load up to 4 persons: 34F/38R
No mention of speed and the car would do 302km/h.
- Joined
- May 12, 2026
- Messages
- 16
Who needs comfort? I like to feel heads/tails facing up when driving over a coin.
