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My tire sensor screen came up today. I hadn't check tire pressure before and checked my tires. 32 psi en front and 37 rear. I checked the door panel and see the range is 29 psi - 38 front and 29-47 psi rear. So where should the tire pressure be to not have the sensor screen popping up? Both front tires were the same and a slight difference in the rear otherwise within limits. Seems like a big variance of pressure is allowed.
I have always found this very confusing. The manual says one thing. The sticker on the door pillar says another. And the sticker on the filler cap says something else!!! My service manager said that I should always go with the pressure on the filler cap sticker. He gave me a reason but I really don't remember what it was (I think it had to do with option packages and weight). In my case that is 37 psi on all 4 tires. I had it originally at 34 psi which is on the door pillar. I have to be honest, I liked the ride better with 34 psi, but any time the dealer has it for something they always gave it back to me at 37 psi so I just left it there.
I would go with the PSI listed on the filler cap.
The label at the door is general PSI range for the car. I believe the one at the filler cap is specific for the wheels you have on your car. For my 21", its 31 PSI all around.
I would go with the PSI listed on the filler cap.
The label at the door is general PSI range for the car. I believe the one at the filler cap is specific for the wheels you have on your car. For my 21", its 31 PSI all around.
I found the different specs confusing too and although I'm running the 32psi listed in the fuel lid, having run flat tires I don't know if it matters They ride terrible no matter what.
I would advise to always follow the recommended pressure rating on the tire itself.
Most tires (at least in US) don't list the recommended pressure, but rather the maximum pressure and load rating.
Plus, even if there is such rating on the tires, I would trust more on the value provided by the car manufacture as the number on tires might not take the actual car weight into consideration (since there is no way to know which car the tires will go)
Last edited by zengshengliu; Aug 2, 2020 at 03:43 PM.
I would advise to always follow the recommended pressure rating on the tire itself.
As zengshengliu says, the sidewall pressure is the maximum the tire is rated for. On mine, it's 51 psi; running that pressure would result in an extremely uncomfortable ride and abnormal tire wear. Very bad idea!
As zengshengliu says, the sidewall pressure is the maximum the tire is rated for. On mine, it's 51 psi; running that pressure would result in an extremely uncomfortable ride and abnormal tire wear. Very bad idea!
I don’t think that going with the recommended tire pressure the tire manufacturer recommends is considered a bad idea. Obviously inflating a tire to its max rating is different than the recommended pressure.
either way I’m sure you will find the tire manufacturer and vehicle manufacturer will recommend pretty much similar tire pressures.
obviously the load in the vehicle and temperature play a major part.
I don’t think that going with the recommended tire pressure the tire manufacturer recommends is considered a bad idea. Obviously inflating a tire to its max rating is different than the recommended pressure.
either way I’m sure you will find the tire manufacturer and vehicle manufacturer will recommend pretty much similar tire pressures.
obviously the load in the vehicle and temperature play a major part.
AFAIK, tire manufacturers do not recommend pressures except for the maximum inflation pressure because those are vehicle-dependent, and you won't find the tire companies taking that responsibility from the auto manufacturer. If you can prove me wrong, I will stand corrected.
I don’t think that going with the recommended tire pressure the tire manufacturer recommends is considered a bad idea. Obviously inflating a tire to its max rating is different than the recommended pressure.
either way I’m sure you will find the tire manufacturer and vehicle manufacturer will recommend pretty much similar tire pressures.
obviously the load in the vehicle and temperature play a major part.
I just check the tires on my car (Pirelli Scorpion Zero All Season). It only list the maximum pressure and load rating. (there is also fine print on the tire wall saying "to follow owner manual or placecard for recommended pressure) I also checked Pirelli website and see no such rating.
We are not saying not to follow recommended rating on the tires (if it exist). It is that I don't think those values are available on the tires (at least those sold in the US). If people just go by the # on the tires without reading it, they might accidentally put in the max pressure into their tires.
here's a question, when i got the car with 21s, they delivered it and it was like 50 psi all around. why would they do that if we're suppose to be running in the low 30s? do they not know the recommended range for the vehicle you have and would let the customer adjust it by themselves?
here's a question, when i got the car with 21s, they delivered it and it was like 50 psi all around. why would they do that if we're suppose to be running in the low 30s? do they not know the recommended range for the vehicle you have and would let the customer adjust it by themselves?
My car came with the Maximum Load PSI as indicated on the fuel cap, rather than the normal load psi. I think they do this just so the customer can go longer without seeing a warning.
In reply to VirginBenz - the factory shipped out new Mercedes at "shipping pressures - so when the tires are "locked down" in transit it does not cause "shipping flat spots".
After received from the factory during Check-In by the dealer service dept those pressures are to be reset - but since the tech's make like $15 for checkin OFTEN AT most DEALERSHIPS many new Mercedes do not get their tires put to correct pressure.
I don’t know where you live but I don’t think techs are making only 15.00 per hour. At the dealer I bought my car at, techs earn closer to 35.00 per hour. Door rate is 140.00 per hour. The high inflation rate in the tires is a tech not doing his job. That is what the PDI is all about.
I don’t know where you live but I don’t think techs are making only 15.00 per hour. At the dealer I bought my car at, techs earn closer to 35.00 per hour. Door rate is 140.00 per hour. The high inflation rate in the tires is a tech not doing his job. That is what the PDI is all about.
That's Canadian dollars... worth about $15 American.
Not all Service Dept Personnel are Techs. The initial wash & cleanup and prep are often done by a junior employee. Maybe the same ones that keep the used lineup clean. Depending on Dealer size there could be one or several entry level, low paid employees.
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