Correct air pressure on my 19" and 20" wheels? - PeachParts Mercedes-Benz Forum

mmaeser · #1 02-05-2003, 05:45 PM

One of my cars has 19" Fitapaldis around with low profile Nittos.......the other car has 19" AMG Aeros with P Zeros........Wwhat is ther correct air pressure to maximize the tire wear? I am running about 44psi at current on all 4 corners..... thx, mike

Ashman · #2 02-06-2003, 12:51 AM

Mike, thats a gorgeous 600.

Very nicely done.

Alon

#3 02-13-2003, 01:36 PM

How does your car ride on those 19's? Is there any less ride quality. Any vibrations? I'm having a vibration problem now with 18" AMG's on. Not sure if its the rims/tires or something else causing the problem.

jeneric21 · #4 02-13-2003, 09:08 PM

I know Tirerack recommends using your stock tire pressure setting; the chart should be printed on your inside gas tank flap.

I thought my OEM stock pressure was a little low (27 psi cold) so I currently use 32 psi in front and 34 in the rears. The ride is good.

I'm using 235/35 R 19 in front with 265/30 R 19 in back.

Tabasco · #5 02-21-2003, 08:26 PM

Jeneric 21-
Tire rack is giving bad advice if they are saying to put normal tire pressure in the wheels as stated by Mercedes. I did that on a previous set of rims on my 2001 Saab convertable and it turned out to be a $1000 error. Normal pressure was 31 lbs from Saab and when I upgraded the rims to Ronal 17" with the 31lbs the rims went bad in 4 months. Called Ronal to complain and the stated that the 17' rims should have a cold pressure of 37 -38lbs cold. Since I replaced the rims and increased the air pressure I haven't had any trouble with the rims. I am running P-6000 tires.

shawauv · #6 12-29-2008, 02:13 PM

Had to modify the wheel wells a bit but the ride is very smooth !

Luke@tirerack · #7 12-30-2008, 11:10 AM

Quote:

Originally Posted by Tabasco

Jeneric 21-
Tire rack is giving bad advice if they are saying to put normal tire pressure in the wheels as stated by Mercedes. I did that on a previous set of rims on my 2001 Saab convertable and it turned out to be a $1000 error. Normal pressure was 31 lbs from Saab and when I upgraded the rims to Ronal 17" with the 31lbs the rims went bad in 4 months. Called Ronal to complain and the stated that the 17' rims should have a cold pressure of 37 -38lbs cold. Since I replaced the rims and increased the air pressure I haven't had any trouble with the rims. I am running P-6000 tires.

tire pressure recommendation are based on the weight of the vehicle not the tire size but, there are exceptions to every rule. While higher pressures do offer a little more wheel protection they are not required in order to meet the required load capacity in many circumstances. We find that a majority of problems occur due to the lack of proper tire maintenance. You would be surprised how infrequently many people check their tire pressure. A standard load tire achieves maximum load capacity @ 36 psi and adding more air pressure does not increase the load capacity.

here's some more information about load capacity

Quote:

Since most passenger tires feature Standard or Standard Load Ranges, only Light Load, Reinforced and Extra Load tires are designated in a tires description.

* Standard Euro-metric tires will have nothing branded on their sidewalls, Extra Load or Reinforced Euro-metric tires will be branded as such and identified by an "RF" or "XL" in their descriptions, as in 305/50R20 XL or 305/50R20 RF.

* Standard Load P-metric tires will have nothing branded on their sidewalls or may be branded as "Standard Load," Light Load P-metric tires will be branded as "Light Load," and identified by an "LL" in their descriptions, as in P285/35R-19 LL. Additionally, Extra Load P-metric tires will be branded as "Extra Load," and identified by an "XL" in their descriptions, as in P235/75R-15 XL.

Only P-Metric sized tires with 45-series aspect ratios or lower may be manufactured in a Light Load configuration. Light Load tires are designed to carry less weight than Standard Load tires and have been developed for specific applications (typically when relatively large tire sizes are used as Original Equipment (O.E.) on relatively small cars or for Track & Competition DOT tires used for racing applications).

In all cases, when changing tire sizes or converting from Euro-metric sizes to P-metric sizes, it is important to confirm that the Load Index in the tire's Service Description of the new tire is equal to or greater than the Load Index of the original tire.

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