My vehicle came with 255/50/19...but l always switch for the winter..Am l able to use 255/55/19's(winters)......Will this set off the TPMS system ????? it is only 3%....
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1999 : Black Opal ML 430 : 125,000 KM (traded-in)
2002 : Bordeaux AMG ML 55 : 130,000 KM (traded-in)
2006 : Silver lridium ML 350 : 53,000 KM (stolen)
2006 : Cubanite Silver ML 350 : 60,000 KM (traded-in)
2010 : Tenorite Grey ML 350
My vehicle came with 255/50/19...but l always switch for the winter..Am l able to use 255/55/19's(winters)......Will this set off the TPMS system ????? it is only 3%....
The TPMS system doesn't monitor the size of the tire, only the tire pressure. The system is set up to allow for a maximum psi and a minimum psi setting. For example 30 psi on the low side and 40 psi on the high side. So long as the PSI of the tire is between those, the TPMS is happy.
Do you swap the tires on the rims or do you have a winter set of rims and tires that you swap to? The reason I ask is because if you have another set of rims and tires then you need another set of TPMS sensors in the rims and those have to be registered to the vehicle. And that might be another reason you would get the TPMS warning.
C-Rod, wouldn't you want to go with a narrower tire and not necessarily a taller tire?
Smooth1, doesn't the ML use wheel speed differential to determine a low inflated tire and not actual tire air pressure?
Mike
Oops, your absolutely right! MB uses an indirect TPMS system that monitors the tire rotation speed. (I have a Lexus also and that has the direct TPMS system that reqiure the sensors.)
So, in that case, if you change your tires to a different size altogether, then you would just have to have them recalibrated.
Oops, your absolutely right! MB uses an indirect TPMS system that monitors the tire rotation speed. (I have a Lexus also and that has the direct TPMS system that reqiure the sensors.)
So, in that case, if you change your tires to a different size altogether, then you would just have to have them recalibrated.
Both of you are not very correct. The MB MLs, GLs and Rs in Canada all use indirect tire monitoring systems (NO individual electronic sensor in the rim). Also they must have day-time running light as required by Canadian laws.
Their counterparts in the US use sensors in each tire. It's just a legal matters.
Both of you are not very correct. The MB MLs, GLs and Rs in Canada all use indirect tire monitoring systems (NO individual electronic sensor in the rim). Also they must have day-time running light as required by Canadian laws.
Their counterparts in the US use sensors in each tire. It's just a legal matters.
First..l do have separate rims for my winters....(19"rims).....Secondly....so there isn't a sensor in the tire..so l don't have to worry about getting sensors for my winters ???? This would make sense, because while l was scanning my manual , l noticed a picture of the MFD and it showed a car picture with 4 numbers at the corners...l thought..cool..it shows the pressure of each tire..but as l read further...it indicated, this was American...Lastly, the reason why l would go with a 55 series instead of a 50 series, is to fill the wheel well a little....l don't have Airmatic...and l don't like the spacing between the rear tire and the wheel well.............
Both of you are not very correct. The MB MLs, GLs and Rs in Canada all use indirect tire monitoring systems (NO individual electronic sensor in the rim). Also they must have day-time running light as required by Canadian laws.
Their counterparts in the US use sensors in each tire. It's just a legal matters.
Actually that is why I changed my position. the OP is from Canada.(Indirect TPMS) When I gave my first answer it was because I am from the USA.(Direct TPMS) When it was pointed out about the other system I realized I was regionally incorrect and posted the correct info.
Last edited by Smooth 1 : 10-23-2009 at 08:32 PM.
Reason: I can't spell sometimes...
First..l do have separate rims for my winters....(19"rims).....Secondly....so there isn't a sensor in the tire..so l don't have to worry about getting sensors for my winters ???? This would make sense, because while l was scanning my manual , l noticed a picture of the MFD and it showed a car picture with 4 numbers at the corners...l thought..cool..it shows the pressure of each tire..but as l read further...it indicated, this was American...Lastly, the reason why l would go with a 55 series instead of a 50 series, is to fill the wheel well a little....l don't have Airmatic...and l don't like the spacing between the rear tire and the wheel well.............
Correct, no sensors to have to worry about. You should be fine once you recalibrate.
The way I understand the system to work is if one wheel is not rotating at the same speed as the others it will give a warning. If all 4 wheels are turning at the same speed then the system does not detect a low inflated tire. Therefore if you increase the diameter of all 4 wheels there should be no calibration required. Conversely if all 4 wheels have low pressure then it will also not detect a low tire.
Than again I could be wrong.
I also thought that all the early W164 ML's had the speed differential system and not direct pressure system.
Than again I'm probably wrong.
Mike
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Winter tire question.......... 
Canadian vs American 
Linear Mode
