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Dave Kew

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2011 E250 CGi Convertible
I'm not only new to owning a MB but also to this forum which I'm hoping can help me! I've bought a 2011 E250 Convertible CGI and I have a slow puncture which when the dashboard information system highlights it indicated that the "Run Flat" tyres may have an issue. I have checked and all the tyres are not run flat, however 2 of them are rated XL for Extra Load and the other 2 are not. I am also a bit confiused as to the size of the tyres on the car

Front 235/40 ZR18 95Y
Rear 255/35 ZR18 94W (XL)

Despite searching the car and the manual I cannot find the correct size of tyre for the car or if indeed it should be fitted with Run Flats, thoughts and comments most welcome

Dave
 

Wighty

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Sunny Essex
Your Mercedes
W211/E320cdi/2009 and CLK200k 2009
I'm not only new to owning a MB but also to this forum which I'm hoping can help me! I've bought a 2011 E250 Convertible CGI and I have a slow puncture which when the dashboard information system highlights it indicated that the "Run Flat" tyres may have an issue. I have checked and all the tyres are not run flat, however 2 of them are rated XL for Extra Load and the other 2 are not. I am also a bit confiused as to the size of the tyres on the car

Front 235/40 ZR18 95Y
Rear 255/35 ZR18 94W (XL)

Despite searching the car and the manual I cannot find the correct size of tyre for the car or if indeed it should be fitted with Run Flats, thoughts and comments most welcome

Dave
Inside the petrol filler cap buddy :D
 

John Laidlaw

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Land Rover Discovery 4
Welcome Dave
typically for Mercedes and BMW your car is fitted with a staggered set up, so this is normal. The tyre sizes will be inside your fuel filler flap. Agreed a bit strange to have XL on 2 tyres and not on the other 2 but no big deal
 

Srdl

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GLC43 AMG 2018 (X253)
Welcome Dave - as far as I know, runflats were never fitted by Mercedes at that time even if the tyre pressure warning mentions it.

Assuming the tyre pressures are correct, you can just reset the tyre warning system (to tell it everything is OK) and see what happens then.
 
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Dave Kew

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2011 E250 CGi Convertible
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Welcome Dave - as far as I know, runflats were never fitted by Mercedes at that time even if the tyre pressure warning mentions it.

Assuming the tyre pressures are correct, you can just reset the tyre warning system (to tell it everything is OK) and see what happens then.

Many thanks for the help so far, I have now located the plate with the tyre details, funny how you can refuel a car and not notice the information plate! Anyway, I'm more relieved that the tyres are the correct size I just need to get to the bottom of the Extra Load issue. I have reset the tyre indicator but it triggered again a couple of days later so either the valve is faulty or it has a slow puncture so will sort it later this week
 

A.J.

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UnMerc - 2020 VW Polo 2.0t GTi Plus, DSG. Flash Red, Traditional VW GTi Tartan seat trim.
Hi Dave, welcome to the forum and the MB world :)
 

Blobcat

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R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
Hello and welcome

Have you measured the tyre pressure in the tyres with a gauge?

Pump them up to the correct pressure then test again the next day.
 
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Dave Kew

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2011 E250 CGi Convertible
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Hello and welcome

Have you measured the tyre pressure in the tyres with a gauge?

Pump them up to the correct pressure then test again the next day.
Thanks for the welcome Blobcat. Yes I did all the tyre pressures and then reset the monitor, there was one tyre significantly lower than the rest and that is the same again yesterday so will get it checked out later this week. I cannot see anything in it so hoping it's just the valve. My main concern was the tyre sizes and the fact that 2 of the 4 were Extra Load rated rather than all of them

Dave
 

Blobcat

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R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
Extra load isn’t an issue, it can make the ride a bit harder but that is all.
What load rating should you have (fuel flap / manual) and have you on the tyres?
Hopefully a valve, likely a nail/screw, way too common unfortunately
 
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Dave Kew

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UPDATE

So the worse case scenario has happened and the tyre is actually fine but the rim has cracked and been previously welded to repair it! DAMN!!! I'm waiting for a call back from the dealer I bought the car from but wanted to know if this is a known problem with the alloys (AMG) or have I managed to buy a car that may be a one off?

TIA

Dave
 

Srdl

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GLC43 AMG 2018 (X253)
UPDATE

So the worse case scenario has happened and the tyre is actually fine but the rim has cracked and been previously welded to repair it! DAMN!!! I'm waiting for a call back from the dealer I bought the car from but wanted to know if this is a known problem with the alloys (AMG) or have I managed to buy a car that may be a one off?

TIA

Dave
I believe it’s a known problem Dave. Ask the dealer to replace at their expense!
 

Blobcat

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R171 SLK280, Smart R451, Land Rover 110 County SW, 997 C2S, R1250 GSA TE 40th, CBR600FP
It’s a known problem with any large alloys and small sidewalls :(
 

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