Tire pressure - Mercedes GLA Forum
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post #1 of 17 Old 02-03-2016, 07:25 PM Thread Starter
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Tire pressure

I passed by a tire shop last night to top off my tires only to find out that I've been running my tires at least 10lbs below the MB recommendation for my tire size. Per the sticker on the door jamb, the recommendation is 44lbs!!

I've had my GLA since Aug '15 and already racked up 7k miles. When I took delivery of the car, I was futzing around the instrument panel and read that I had 32lbs for front tires and 29lbs for the rear tires. Thought nothing of it at that time since I figured everything was to factory specs. I never bothered looking at the sticker either.

Concerned, I spoke to a service adviser this afternoon and was assured that no damage was done to my tires.

Has anyone experienced this? I know we don't get any warranty for the tires, but "if" I run into an issue with the tires down the road and am told it's due to running them low, I want to be able to have an argument.

Anyone?
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post #2 of 17 Old 02-03-2016, 08:12 PM
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First what tires and size is on your GLA? Do you have run flats or performance tires? Is it a US spec GLA and the reason I ask is there are many variants of the GLA depending on the country of delivery. With that said I have not heard of any spec for 44 lbs and the norm is 36 lbs (understand the manufacture has to balance ride comfort-performance (as in handling)-mpg performance-tire tread wear so the inflation specs reflect those parameters). Point being is that your tire pressures you noted are fine and do not 'damage' your tires. I do not run my tires at 35 psi but rather at 32 psi…I do not care about mpg performance/tread wear but do care about performance.

You should verify where you are seeing this "44 lbs" spec

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post #3 of 17 Old 02-03-2016, 08:40 PM
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As I recall, there is a sticker inside the fuel filler door that list the correct tire pressure. The fuel door sticker list 33 front, 29 rear as normal tire pressure with 44 being the max for both.
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post #4 of 17 Old 02-04-2016, 07:57 AM
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For a US spec 2015 GLA45 with 19" summer performance tires (NON run flats), the sticker on the side of the fuel door notes tire pressures (depending on number of people and amount of baggage on board) from (front-rear) 35lbs/32lbs to 36lbs/36lbs. The is no max inflation noted. On the tires themselves (19" Continental ContiSport) there is a max pressure noted of 51 lbs which would be for tire mounting purposes.

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post #5 of 17 Old 02-04-2016, 12:00 PM
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Do NOT use the tire pressure numbers listed on the door jam.
Those numbers are the maximum tire pressures.
Only use the tire pressure numbers listed on the fuel filler flap.

For my USA 2016 GLA 250 4Matic, they are Front 33 PSI, Rear 29 PSI for normal loads.

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post #6 of 17 Old 02-04-2016, 12:10 PM Thread Starter
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Originally Posted by SSBGLA45 View Post
First what tires and size is on your GLA? Do you have run flats or performance tires? Is it a US spec GLA and the reason I ask is there are many variants of the GLA depending on the country of delivery. With that said I have not heard of any spec for 44 lbs and the norm is 36 lbs (understand the manufacture has to balance ride comfort-performance (as in handling)-mpg performance-tire tread wear so the inflation specs reflect those parameters). Point being is that your tire pressures you noted are fine and do not 'damage' your tires. I do not run my tires at 35 psi but rather at 32 psi…I do not care about mpg performance/tread wear but do care about performance.

You should verify where you are seeing this "44 lbs" spec
Tire size 235 45 R19. I have the H rated run flats Continentals. US Spec.
The 44lbs spec is on the door jamb.
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post #7 of 17 Old 02-04-2016, 12:13 PM Thread Starter
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Originally Posted by zico21 View Post
As I recall, there is a sticker inside the fuel filler door that list the correct tire pressure. The fuel door sticker list 33 front, 29 rear as normal tire pressure with 44 being the max for both.
I actually saw that. Thanks! Will drop the pressure back to what it shows as normal load from the numbers inside the fuel filler door.
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post #8 of 17 Old 02-04-2016, 12:14 PM Thread Starter
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Originally Posted by WhiteRabbit View Post
Do NOT use the tire pressure numbers listed on the door jam.
Those numbers are the maximum tire pressures.
Only use the tire pressure numbers listed on the fuel filler flap.

For my USA 2016 GLA 250 4Matic, they are Front 33 PSI, Rear 29 PSI for normal loads.
Got it. Looks like 33/29 PSI are my golden numbers. Thanks!!
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post #9 of 17 Old 02-04-2016, 12:15 PM Thread Starter
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Thanks everyone for your responses!!
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post #10 of 17 Old 02-04-2016, 03:54 PM
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Quote:
Originally Posted by Enklein View Post
Quote:
Originally Posted by WhiteRabbit View Post
Do NOT use the tire pressure numbers listed on the door jam.
Those numbers are the maximum tire pressures.
Only use the tire pressure numbers listed on the fuel filler flap.

For my USA 2016 GLA 250 4Matic, they are Front 33 PSI, Rear 29 PSI for normal loads.
Got it. Looks like 33/29 PSI are my golden numbers. Thanks!!
Funny but I've noticed a consistent variation on fuel consumption with 32 vs 36 psi with the latter being better (i.e., about 3 miles per gallon more). And after a few months I decided to run all four with 36 psi
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