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Discussion Starter · #1 ·
Hi guys, So my car has come upto 13k miles now and my front tyre tread are now on the legal limit :/ (1.6mm)

But my back tyres are 5mm so i'm just going to swap front and back around for now then get new set of tyres when they're all quite worn out.

I just wanted to know if the car will show the correct tyre pressures on the on-board computer?

Like when i change the back to front, will it show the pressures for the back tyres on the front wheels on the computer? Or is the car clever enough to know?
 

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On every tyre pressure monitoring system I've had in the past, each sensor is set up to be a specific wheel - I wouldn't expect Mercedes to be any different - and if your tyres are on the legal limit, I'd get them changed now, not swap them around, especially with winter coming.
 

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Hi guys, So my car has come upto 13k miles now and my front tyre tread are now on the legal limit :/ (1.6mm)

But my back tyres are 5mm so i'm just going to swap front and back around for now then get new set of tyres when they're all quite worn out.

I just wanted to know if the car will show the correct tyre pressures on the on-board computer?

Like when i change the back to front, will it show the pressures for the back tyres on the front wheels on the computer? Or is the car clever enough to know?
Your tyres will still be on the legal limit, but just on the back wheels.... I would get them changed if I were you. Why spend all this money on a car but can’t afford new tyres?
 

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How is the car that smart? Or the sensors are smart figuring this out?


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How is the car that smart? Or the sensors are smart figuring this out?



See previous thread:

 

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I stand corrected :) However, my other advice still stands - if you have tyres on the legal limit, get them changed for new tyres ASAP especially with winter coming where worn tyres like that can affect the handling.
 

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I stand corrected :) However, my other advice still stands - if you have tyres on the legal limit, get them changed for new tyres ASAP especially with winter coming where worn tyres like that can affect the handling.
The better tyres should always be on the rear of a car, whether it is front or rear wheel drive.
 

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Why is that? I thought best tires should always go front (on a front wheel drive).


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The TPMS sensor for this car is actually built into the ABS sensor. Hence why it doesn’t give you a PSI reading. Some cars have an actual valve sensor for each tire - but not this model. Moving tires around has zero effect. Just make sure to reset the system after you’ve swapped them.
 

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Arise, to answer your question, best tyres on the back to stop the car spinning round mainly on a corner, you do not want a tail end breakaway.
 

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The TPMS sensor for this car is actually built into the ABS sensor. Hence why it doesn’t give you a PSI reading. Some cars have an actual valve sensor for each tire - but not this model. Moving tires around has zero effect. Just make sure to reset the system after you’ve swapped them.
Are you sure? The Mercedes Me app and the dashboard both give actual tyre pressures in PSI on my car. (A177 Premium).
 

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The TPMS sensor for this car is actually built into the ABS sensor. Hence why it doesn’t give you a PSI reading. Some cars have an actual valve sensor for each tire - but not this model. Moving tires around has zero effect. Just make sure to reset the system after you’ve swapped them.
Even if it gave a reading in vulcan atmospheres nothing stops software converting it to psi. I have psi for my in-car and app readings too.
 

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The TPMS sensor is not in the ABS sensor, it is fitted into the tyre valve. Amazon have them for sale.

 

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Maybe it’s different by country? When I pull up the Mercedes me app i don’t see the PSI number, I just see “-“ for all 4 tires. The dealer told me it’s part of the ABS sensor, same as my 2019 CLA. I just replaced two tires recently (CLA) and there was no sensor visible. Now I’m confused - lol.
 

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There are 2 variants of TPMS

Indirect - uses the ABS sensors to monitor individual wheel revolutions, and reports when one or more wheels varies beyond a certain wheelspeed window (eg when punctured). This variant does not display any pressure as it does not measure pressure.

Direct - uses pressure transducers fixed to the tyre valves, and transmits the pressures via RF to individual receivers in the wheel arches. This variant displays pressures on MBUX and/or other internal display in the car.

Previous Thread:
 

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Discussion Starter · #20 ·
Thank you everyone for your comments. I think resetting the pressures would be the best thing for now. I have my car booked at mercedes next monday so will ask them about it.

And yes i know i need to change my tyres asap, i will be doing this in my service which is coming up very soon.

Does anybody have any recommendations for nice performance tyres? Currently i will be going for Michellin Pilot Sport 4. I have the standard AMG line alloys you get on all UK models (5 twin spokes 18")
 
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