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Old 12-12-2014, 05:04 PM   #1
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Tire Pressure Towing with BMW X5

We recently purchased a 2015 BMW X5 35d and will be using it to tow our 2011 Airstream Flying Cloud 25FB. (We had the hitch installed/reinforced by Can AM RV). For those of you out there that tow with a diesel SUV, how much do you increase tire pressure(s) for towing? We have the standard Goodyear Eagle LS 255/55x18 run-flat tires. The max pressure is 50 psi. The recommended normal pressures for our X5 are 33 front/41 rear. How much (if any) should I bump-up the front/rear pressure for towing?
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Old 12-12-2014, 05:08 PM   #2
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I fully expect there to be two pressures listed on the driver's door jam, one for normal load and another for max payload. Probably your best bet for pressure recommendation.
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Old 12-12-2014, 06:16 PM   #3
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BMW has commonly listed two sets of pressures (for each available tire size), relating to up to four passengers, and the other at max load (five or 7 passengers plus luggage). They have also commonly listed two sets of pressures for the above load conditions, based on up to 100 mph and sustained driving over 100 mph (autobahn influence). Make sure you are using the lower speed set of numbers.

I wouldn't go any higher pressure than the full load figures.

My last X5 had 32/32 listed for up to 4 passengers, and 32/39 (F/R) listed for max load, both for driving at up to 100 mph. I never put more than 35 psi in the rears even fully loaded, and 32 the rest of the time, and had excellent tire life and very even wear. If I did use the 41 psi your vehicle lists, I would be keeping an eye on the rear tires for wear in the centre of the tread.

Jeff
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Old 12-12-2014, 06:51 PM   #4
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See my avatar; 2001 X5 with 255/19s front and 285/19 rear towing a 2002 ASCL 31'. Normal inflation is 32F/32R. While towing with 4 passengers (35,000+ miles) I have run 32F/39R as per BMW specs.

Due to "Sport Package" negative camber on rear tires I have to "flip" the rear tires on the wheels to move the inside wear to the outside. I do this at ~22K miles which allows me to get ~45K miles from the rear tires. The front tires give me ~50K miles, but wear the center; seems to be the nature of the Michelin Diamaris tires.
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