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Discussion Starter #1
Hi all,I know the pressure is located on the filler cap but it doesn’t say this is the correct for the 20s 255/45/20r
Normally there’s multiple choice for the size rims fitted to car ..
Can anyone let us know what pressures they run please
Regards
 

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Discussion Starter #3
Cheers mate,I know when I had me A45 everyone used to use different pressures ,slightly different car tho lol
 

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GLC 250 Petrol motor, Steel springs, Run flat Bridgestone Duellers 255/45 R20, 30K+ Kms.

Tried the placarded 32psi first, thought that this produced higher tyre wear on both inside and outside edges.
Have run 37psi for most of the last year ...now indicating slightly higher mid tread wear.
..Now moved back to 35-36psi

Agree, handling is a little more tighter/responsive with higher pressures, however ride is also a little more harsh.

However I think the harshness is directly related to the stiffer side-walls of the Run Flat Tyre design.
Will be replacing with non run flat, standard tyres, when the time comes ….possibly inside another 10K Kms.
(Can of goo/slime and 12v compressor in the back at all times ..should give the same or better flat recovery)

Phil.
 

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Discussion Starter #7
Cheers guys,I’ve set mine at 34psi (in the middle ��) see how it drives ,that being not that far from the recommend 32psi and agreed on the run flats as soon as my Pirelli’s are done I’m changing to non run flats ,used to have a BMW 330D on run flats ,change over to nons and completely change the car in my opinion.
Car goes in for its diagnostics on 16th April for the tyre skipping on full lock fault ,not confident of the dealership tho and expecting another battle to get the knuckle fix done ...sleeves are already rolled up �� hopefully their remember my name from the AMG A45 last year and the few arguments we had and know I’m not prepared to take any of there nonsense..needless to say I’ll be taking few of the posts on here as ammunition �� such a pity that Mercedes-Benz after-care from some of the dealers is absolutely diabolical,certainly didn’t think when getting the GLC I’d be doing all this again ��������������
 

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The decal on the driver's side door jamb of my 2017 GLC 300 Coupe with 20 inch staggered setup states: 35 psi for the fronts and 42 psi for the rears. Odo just turned 15K miles and the tires are wearing evenly and are good for another 10-12K miles at least. I have always followed the recommended pressures. Tires are Goodyear Eagle Sport run-flats. Not a cushy ride, but well connected and not bad for run-flats.
 

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There is another sticker under the gas cap, so might want to compare
 

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The decal on the driver's side door jamb of my 2017 GLC 300 Coupe with 20 inch staggered setup states: 35 psi for the fronts and 42 psi for the rears. Odo just turned 15K miles and the tires are wearing evenly and are good for another 10-12K miles at least. I have always followed the recommended pressures. Tires are Goodyear Eagle Sport run-flats. Not a cushy ride, but well connected and not bad for run-flats.
IRC ..somewhere else in this forum , folk noted that some vehicles, had stickers on the door jam that reflected fully loaded conditions, not unloaded figures which can be found under the fuel flap.

Is good that the wear pattern is even across the tread face.

..however 27K miles…..sounds a little higher wear!! …..at least to me!!
...but many variables here ….plus I know nuttin' :smile2:
 

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Hi they should be 32psi all round . With normal load. It is shown on my fuel cap . I have the 20s Run flats on my 2019 GLC 250 4Matic. Hope this helps.
 
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