GLO

Hi Guys,

Just wondering how many of you actually get a wheel alignment (front and rear)?

I have just replaced all 4 tyres and whilst the wear was pretty even, I found the front tyres would wear out on the shoulders faster than the center tread. (rear tyres were down to the indicator on the inside whilst leaving about 1.3mm from the indicator on the outside)

Does anyone know what is the optimal camber,caster and toe-in settings to get the best our of the tyres?

I plan on rotating every 5000km now.

Lots of round abouts in my locale.

thanks

ODIOUS

Inimagine rotation is pretty costly with these tire pressure monitoring sensors.
In addition to GLO's inquiry can anyone touch on this aspect?

It would be awesome if you could change the sensor assignment...

GLO

Apparently the tyre monitoring actually monitors the rotation of the tyre at each corner, rather than a sensor in each rim.

ODIOUS

That IS interesting...
I'll have to read up on that.

GLO

Tyre pressure loss warning system

Important safety notes

While the vehicle is in motion, the tyre pressure loss warning system monitors the set tyre pressure using the rotational speed of the wheels. This enables the system to detect significant pressure loss in a tyre. If the speed of rotation of a wheel changes as a result of a loss of pressure, a corresponding warning message will appear in the multifunction display.

The tyre pressure warning system does not warn you of an incorrectly set tyre pressure. Observe the notes on the recommended tyre pressure more.

ODIOUS

Ah.. I see. Seems like we (I) may have the monitors that are mounted inside the tires as I get readings on each tire.

To answer your questions about alignment... I will go to a tire tire shop where I get my alignments done on another car and ask them to print me out the specs and tolerances for the R. Hopefully I can get this done this weekend if I dont find it online first.

DukeBoy27

For US cars, the TPMS is in each wheel, near where the valve stems are. I believe the system "learns" each sensor individually, so rotating wheels & tires front/rear should not result in issues.

Unless I am missing something here, 0 degree toe/camber/caster all-around should maximize distribution of weight on the tire surface and lead to best wear results? With that said, I tend to like a very slight negative camber sometimes to achieve better stance (on other cars, have not played with the R yet).

Also, bear in mind that sometimes outside wear can increase due to a combination of

1) Excessive cornering speed
2) Low tire pressure
3) Tires with soft sidewall

On my old GLK and Saab 9-2x, the outside will wear faster no matter what I do since I cornered, uh, sportingly. I drive the R like my grandmom would and, unsurprisingly, the tires wear more gently and evenly...

Lastly, cars do go out of alignment, especially if you run into/over curbs. My tire techs would always recommend a realignment every 10k miles or so to keep things straight.

PeteInLongBeach

Your tire wear sounds typical of under-inflated tires. I'm not sure if TPMS is set-up the same in your area, but the north american manual details a recalibration procedure (which I have used since I run overinflated tires). See page 370 in particular :

http://www.mbusa.com/vcm/MB/DigitalA..._r350_r500.pdf

GLO

I agree the wear indicates low pressure but i run 40psi all round,

I just has a 4wheel alignment done and they flattened out the rear camber just a touch more and the front end had a tad too much toe in.

Fingers crossed that this will give me the better tread life.