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BMW 5-Series (G30) Forum Wheels | Tires | Suspension | Brakes | Chassis Recommend tire pressure for rear tires?

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      11-10-2018, 09:07 PM   #1
boonkgang13k
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Recommend tire pressure for rear tires?

My 530e's rear tires are currently at 38-39 psi, but the recommended psi shown on the screen is 45 psi. They were set to 38 by the tire shop technician. So should I go with the BMW recommendation or the technician's?
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      11-10-2018, 09:29 PM   #2
orangeglim
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I would go by the pressure printed on the sticker inside the driver's door.
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      11-11-2018, 01:31 AM   #3
omera60
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Always go by the manufacturers recommendation that is on the sticker, remember they are the ones who built your car so they know it the best. In the olden days tire pressure were more or less the same (especially where I live) and you didn’t have a lot to go with so old mechanics even today still go with the “standard pressure” they have. Just a reminder, adjust them when the car is cold (shouldn’t have covered more than 2km from the start, if they are hot wait 2 hours for them to cool down).
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      11-11-2018, 01:35 AM   #4
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      11-11-2018, 03:19 PM   #5
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Advice on plate on car is for fully loaded, and nowadays for rear an overloading is taken into account. So this is verry high,and comfort and gripp is totally gone when you drive allone ,wich is 99% of use.
So even 38 psi can be on the high side.

I am able to calculate a safe lowest pressure for the weights on tires and maximum speed used( and wont go over for even a minute).
Pressure advice is to give the tire a deflection that wont overheat any part of tire when driving the maximum speed used constantly.
Once a part of tire has been overheated long enaugh, the damage is ireversible, and every next deflection crackes the beginning cracks fuether, untill mayby only after 3 years the damage is that much build up that the tire blows, and accident and injuries. Then the moment of damagestart is already forgotten.
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