Tire pressure?
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lexus IS-F
Tire pressure?
I have 2014 GL450 with 19" rims (275/55/r19). The label on the driver side door says that cold tire recommended pressure is 39psi front and 47psi rear. But the gas tank door lebel says 32psi both bront and back. What is the right answer? Thanks.
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2013 GL450
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15 GL550
then you should inflate to those pressures. The high pressures keep the tires from overheating under those conditions. Otherwise, as was stated, it is really a matter of preference. The fuel door gives you the minimum. On my 09 X164 with 20" runflats, I got about 40k miles out of my tires which seemed very good compared to what other people using more pressure were getting. From what I understand, adding more pressure will get you more tire wear in the center of your tread and less will give you wear on the outside of your tread (which is what I noticed on my X164). I only have about 100 miles on my 20" Pirellis so I don't know how they will do but I tend to use the lowest pressure possible to achieve a softer ride. So, it's the fuel door for me and I add a little pressure on long trips.
Last edited by 43221B; Jul 11, 2014 at 02:12 PM.
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2013 GL 550
I run 32 pounds or it will eat the centers. I've been running oversize/wide/low profile tires on all my cars for years and this is the magic pressure. On super wide tires such as 345's I run 29 pounds. When I get my oil changed I make sure the guys don't add pressure.
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From: NYC
18 E63s Wagon 15 GL63 (sold), 10 Turbo TT MT, A36 Bonanza, 20 JLU Rubicon
On a 21 inch 550/63 wheel... 39 works best for me. Anything less and you run the risk of damage from potholes...
On 20 inch...you could probably drop down to 37 and be fine.
The problem is that on big temp swing days it can get hot causing the wheel pressure to start off at 39 and end up near 44 and that really is to hard and uncomfortable...
Btw.. The interior sensor seems to run a lb higher than a high quality gauge.
On 20 inch...you could probably drop down to 37 and be fine.
The problem is that on big temp swing days it can get hot causing the wheel pressure to start off at 39 and end up near 44 and that really is to hard and uncomfortable...
Btw.. The interior sensor seems to run a lb higher than a high quality gauge.
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From: Greenville Delaware
2015 GL 550
On a 21 inch 550/63 wheel... 39 works best for me. Anything less and you run the risk of damage from potholes...
On 20 inch...you could probably drop down to 37 and be fine.
The problem is that on big temp swing days it can get hot causing the wheel pressure to start off at 39 and end up near 44 and that really is to hard and uncomfortable...
Btw.. The interior sensor seems to run a lb higher than a high quality gauge.
On 20 inch...you could probably drop down to 37 and be fine.
The problem is that on big temp swing days it can get hot causing the wheel pressure to start off at 39 and end up near 44 and that really is to hard and uncomfortable...
Btw.. The interior sensor seems to run a lb higher than a high quality gauge.
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Super Member
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From: Illinois
2014 Mercedes-Benz GL63 AMG
I've been running 38 psi and as another member mentions, it ate the centers up. Centers are 3/32nd and the outer channels are 6/32nd.
I will now be running 32-34 PSI cold. It's such a wide tire this appears to be the best to keep it flat.
I run 38-40 psi on my other cars with more narrow tires to get better gas mileage, but the wear is more even.
I will now be running 32-34 PSI cold. It's such a wide tire this appears to be the best to keep it flat.
I run 38-40 psi on my other cars with more narrow tires to get better gas mileage, but the wear is more even.
Super Member
Joined: Feb 2007
Posts: 947
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From: NYC
18 E63s Wagon 15 GL63 (sold), 10 Turbo TT MT, A36 Bonanza, 20 JLU Rubicon
I've been running 38 psi and as another member mentions, it ate the centers up. Centers are 3/32nd and the outer channels are 6/32nd.
I will now be running 32-34 PSI cold. It's such a wide tire this appears to be the best to keep it flat.
I run 38-40 psi on my other cars with more narrow tires to get better gas mileage, but the wear is more even.
I will now be running 32-34 PSI cold. It's such a wide tire this appears to be the best to keep it flat.
I run 38-40 psi on my other cars with more narrow tires to get better gas mileage, but the wear is more even.
(I know as I have both bent one wheel and blew a tire with my 22s whilst being careless and letting the pressure get down to 35)
I too have had issues with my old GL550 X164 with the center of the tires wearing in the rear... but I have not seen that with the 166.
Super Member
Joined: Jul 2003
Posts: 963
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From: Illinois
2014 Mercedes-Benz GL63 AMG
I can see you argument. I mentioned it's what I personally do - it wasn't advice, the members can make of it what they wish.
32 PSI is what my authorized MB dealership sets the tire pressure to. It's also on the fuel door.
Each member can make the decision for themselves - higher the PSI, more rim protection, more wear on suspension, stiffer ride, better mileage, less rolling resistance.
Less PSI, less rim protection, less wear on suspension, softer ride, more rolling resistance.
Just don't go below 32 psi cold.
32 PSI is what my authorized MB dealership sets the tire pressure to. It's also on the fuel door.
Each member can make the decision for themselves - higher the PSI, more rim protection, more wear on suspension, stiffer ride, better mileage, less rolling resistance.
Less PSI, less rim protection, less wear on suspension, softer ride, more rolling resistance.
Just don't go below 32 psi cold.
you will absolutely run the risk of blowing out and / or bending a 21 inch rim out there with a 40 series tire.. that is just bad advice on the internet.
(I know as I have both bent one wheel and blew a tire with my 22s whilst being careless and letting the pressure get down to 35)
I too have had issues with my old GL550 X164 with the center of the tires wearing in the rear... but I have not seen that with the 166.
(I know as I have both bent one wheel and blew a tire with my 22s whilst being careless and letting the pressure get down to 35)
I too have had issues with my old GL550 X164 with the center of the tires wearing in the rear... but I have not seen that with the 166.
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Joined: Jun 2015
Posts: 162
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From: Greenville Delaware
2015 GL 550
Tires are consumables ... wheels are not. I would prefer to wear out my tires rather than to damage my wheels. If the tires wear too fast or too unevenly that can be mitigated by purchasing tires from a different manufacturer or in different sizes, which can be planned for ... unlike a sudden blowout due to wheel damage. OEM tires are less than $400 each ... what's the cost for a wheel?
http://www.tirerack.com/tires/tires....0&autoModClar=
http://www.tirerack.com/tires/tires....0&autoModClar=
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Carrera S;
Mentioned this under a different subject-we have a 2014 GL550-run 38 psi all round (cold). While in FL, we hit a median at about 30 mph-the left front and rear wheels & tires were destroyed. As the car had 11,000 miles on it, MB required all four tires be replaced. Total cost with alignment just short of $5,000.
No damage to suspension parts and fortunately the airbags didn't deeply. Actually the GL didn't even bounce much.
No damage to suspension parts and fortunately the airbags didn't deeply. Actually the GL didn't even bounce much.
