03-24-2019, 02:07 PM | #1 |
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Air pressure
Hi guys,
I have a question concerning the tire pressure. How much air pressure are you using? Summer tires OEM rims 20”: 265/35 Pirelli P Zero 3.1 bar (44.9psi) 295/30 Pirelli P Zero 2.7 bar (39.1psi) Winter tires OEM rims: 265/35 Pirelli Sottozero II 2.6 bar (37.7psi) 295/30 Pirelli Sottozero II 2.7 bar (39.1psi) Why is there such a big difference between sommer / winter fronts? |
03-24-2019, 05:13 PM | #2 | |
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03-25-2019, 03:47 AM | #4 |
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03-25-2019, 09:53 AM | #5 | |
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If it is from the tire...that's probably the MAXIMUM tire pressure that Pirelli has listed on the tire...which is a safety warning...not a recommendation. The tire manufacture makes a tire that can be mounted on a vast number of different automobiles...and the inflation number on the tire's sidewall is designed to indicate the maximum amount of pressure the tire was designed to handle. It's not the recommendation for what the pressure should be...that info is provided by the car manufacturer and a label should be adhered to the door/door jamb that gives the car manufacturer's recommendation.
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03-25-2019, 01:56 PM | #6 |
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Hi Qsilver,
I got the information direct from Pirelli. I wrote to the technical department in order to get information/approval concerning the winter tires. Pirelli do not have a winter tires in 295/30 with a BMW identification. So they advised my to take one with a Porsche identification. As you said, the tire manufacturer have tires for a vast number of cars. Each car have another performance, ergo the tire is specific for this car. I.e the Porsche 911 have the engine in the back therefore the tire is build differently than the one for an Audi Quattro. Tire identification in terms of car manufacturer: * = BMW, MINI AM4, AMB, AM9, AMP, AMS, AMV, AM = Aston Martin AO, AOE, R01, R02 = Audi AR, ARR = Alfa Romeo B1, BC, BL = Bentley F = Ford HP = Pagani J, J1, JRS = Jaguar K1, K2 = Ferrari L = Lamborghini LR = Land Rover LS = Lotus MC, MC1 = McLaren MGT = Maserati MO = Mercedes MO Extended / MOE = Mercedes recommended with run flat N0, N1, N2, N3, N4, N5, N6, NX = Porsche RO1 = Audi recommended Audi Quattro S1 = Peugeot recommended VW =Volkswagen recommended (Yokohama) decibel E70 B = OEM Toyota Yaris and so on. I think I will try it out, first Pirelli recommendation and than BMW. |
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03-25-2019, 04:36 PM | #7 | |
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19 20 21, 295 305 325 different size doesnt matter. 35 psi is good for any tire brands. Thats what i know. |
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03-25-2019, 07:05 PM | #9 | |
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03-25-2019, 11:07 PM | #10 |
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Too high PSIs will result in wearing down the middle of the tires faster than the edges, and too low PSIs will result in wearing down the edges faster than the middle of the tires. Both will result loss of traction and wear down tires unevenly.
Follow the recommendations in the manual of your car. Summer and winter tires have different PSIs and it depends on 19 or 20 wheels, too. In addition, it has recommendations for speed over 100 MPH, too. Don't follow that (my opinion) because I had bad results and below was my experience of it. The recommendations for 19” winter tires for over 100 MPH is front 37 PSI front, rear 41 PSI. I set the back tires to between 39-40 PSI, and the front tires to 34-36 this winter. I just changed my tires back to summer tires and I noticed the back tires worn down in the middle significantly than the edges after about 3000 miles. I think I grinded the middle down about 4/32 but the edges barely had any wear. The front tires didn’t wear out much at all and evenly across. I just flushed $700+ down the drain with this experiment . Hopefully people learn from my mistakes . Just for info, I run Porsche performance winter tires on my car, MICHELIN PILOT ALPIN PA4 N-SPEC which is better than Pirelli Sottozero II in all categories. The conclusion for my little experiment is to keep the tire pressure within 34-36 PSI. Again, follow the car manual for air pressure that recommended for under 100 MPH. You will ruin the tires so fast if you set it higher or lower than the recommended tire pressure in the car manual. Last edited by JC04; 03-26-2019 at 12:43 AM.. |
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03-26-2019, 07:37 AM | #11 |
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Thank you guys I will report the out come of the little experiment with the tire preassure. I guess the recommendsation from BMW are more precise than the one from Pirelli. We'ill see.
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05-19-2019, 06:36 AM | #12 |
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I almost forgot to report the result. After spending hours and hours with researching e-mailing and on the phone here is the result.
It doesn’t matter what kind of tire you use with BMW recognition(*) or without stick to the recommendation indicated on the sticker in the door. Check the pressure on cold tires. Too high and the ride quality goes in direction harsh and the center wear is quite high. To low and the quality is like wobbling and the outside tire wear is high. It is important that you perform an alignment ones or twice a year as the M6 really eats the tires if the alignment is off. |
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05-19-2019, 09:08 PM | #13 |
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Just FYI, the manual states 2 different pressures depending on load and speed.
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