C250 4-matic (204.085) comes with comparative rotation speed sensors in Canada(indirect).

Is it okay to order winters from tirerack without the sensors.Cheaper and less tech hassle? Does indirect means that there is no sensor actually?


Would Tirerack supply the US spec MB TPMS anyway with the direct sensors(tire pressure not rotational speed) not compatible with the Canadian monitoring system?


quote:
TPMS Facts

Direct TPMS use a sensor in the wheel/tire to wirelessly relay pressure back to the driver via a display inside the vehicle. Some vehicles have a digital screen that continuously shows all four tire pressures (five if spare has sensor). Others simply flash a "low tire pressure" light on the dash. Additionally, there are two different styles of sensors for a direct system: a valve sensor and a strap/band sensor. Only valve sensors are used on Mercedes-Benz direct system-equipped vehicles. If you bought an aftermarket SmarTire TPMS, its sensors are held on by a strap around the barrel of the wheel.

Indirect systems work in conjunction with the ABS wheel speed sensors that “count” the number of revolutions of each tire. If the right front tire is low (25psi) it will spin faster than the left front tire (35psi). The ABS system will recognize this change and alert the driver with a flashing light and possibly a loud chime. The Mercedes-Benz indirect systems do not affect the fitment of aftermarket wheels.
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Tom 2010 C250 4-matic Sport (Canada)

You'll have a constant error message that can't be turned off.

Your car won't be as safe without sensors as it is with them.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
Two BMW motorcycles

Do TPMS Sensors give TPS reports per chance???

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2004 E320 Wagon W211
2000 CLK430 Convertible W208
1985 300SD W126
1983 300D W123

I have read since my initial post that there is no actual sensor in Canadian MB, and we are supplied with the indirect type of Tire Pressure Loss system ,a computer program that analyse the rotational speeds of the 2 corresponding wheels.There are no sensors in the wheels!
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In the US system there are actual sensors in the tire valve therefore you may get the error message if no tire valve sensors are installed.


From Benzworld.org:


Quote:
Originally Posted by am_beagle View Post
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...
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Old 10-23-2009, 08:37 PM #9 (permalink)
Smooth 1
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Date registered: Nov 2008
Vehicle: ML 350
Location: Florida
Posts: 119

Quote:
Originally Posted by C-Rod View Post
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.
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Tom 2010 C250 4-matic Sport (Canada)

I have a similar situation. I have wheels form an 06 Audi A4 I am using for winter wheels. For my 2008 C300, I imagine it also does not have sensors on the wheels; it is a Canadian car.

Cheers,

Walter
1990 300E
2008 C300