[X5plug-in]

So gurus - should the tyre pressures be different for summer and winter tyres and specifically what do you advise for a 3.0d on 225/60 R17 non-run flat Dunlops (summer and winter) for a driver and little additional load? Thanks.

[Le Chef]

Check the instruction book for tire pressures for the size of wheel and tire that matches your winter setup. If you have TPM that should tell you when to put air in. During winter as the temperature drops I check tire pressures using a hand gauge and put in air accordingly.

[X5plug-in]

Thanks. I think someone on here was offering more detailed advice than the manual offers, which is 2.2/32F and 2.4/35R with no mention of summer/ winter. I use a digital pump with a guage.

[mlifxs]

Originally Posted by X3buyerScotland

So gurus - should the tyre pressures be different for summer and winter tyres and specifically what do you advise for a 3.0d on 225/60 R17 non-run flat Dunlops (summer and winter) for a driver and little additional load? Thanks.

for reference, Tirerack.com has several good writeups on the topic as well as other tire-related topics

http://www.tirerack.com/about/techcenter.jsp

see the section: Air Pressure - Tire Inflation

[CanadianDriver]

@X3buyer: as a good buffer for winter
- inflate them upto specs for 5 passenger loads
- measure while tires are cold and note the temperature outside
- example, 5 Celcius: when temperature dips to -10C, your tyres would have lost 3psi. your buffer helps in this situation

general guideline is 1 psi reduction for every 5C drop.

[Le Chef]

There should be no difference, maybe add a LB to each corner. The key is regular monitoring as the temperature drops. If you remember Boyle's Law from grammar school physics (PV/T) you should be fine. For imperialists this means roughly 1lb for every 10F temperature change.

[Ural]

When I first picked up the car (last Wednesday) pressures were 2.05 F vs 2.25 R according to my Michelin digital gauge, so quite close to what manual says. I don't know if they came like that from the factory or dealer readjusted them before delivery. Dunlop RFTs 225/60R17 .