Tire Pressure?

[flatsix02]

So tonight i thought my tires looked a little low, so i took my BMW tester and went around and tested multiple times, very cold tires too. Havn't driven for a few hours and its only 20F.

Heres my results: LF - 31 RF - 29 This was with multiple tries and resets too, is this normall??
LR - 29 RR - 29

Thanks,
Scott

[milliethemini]

It depends on what size tires and wheels you have on your MCS. But regardless, 29 - 31 PSI is low, and should be considered underinflated.

Don't be surprised with the low tire pressure; during the winter time car tires do lose pressure more rapidly due to the temperature.

Check your owner's manual to see what the recommended pressure is. I know that on my MCS, with standard 195/55/16 runflats, the minimum is 33PSI. With a full load, 38 PSI. I put my tire pressure in between, at around 36 PSI, because I like a firmer ride, and also because in the wintertime, I can go a 2-3 weeks without checking the tire pressure and know that even if I lose 2-3PSI during that period, the tire pressure is still within the safe limit.

If you have aftermarket tires, check the tire sidewall to see what the max PSI rating is. It's recommended to check your tire pressure monthly, but in the wintertime I would recommend doing it weekly.

[KenL]

I thought the reduced pressure was just due to the temperature difference not that the tyres lose air more in the winter.

Pressure and temperature are proportional so lower temperature gives a lower pressure reading.

I usually check my pressures every two weeks or so.

[Root Ginger]

I know 30PSI all round is the correct pressure for Runflats on the Cooper with the 16" 5 spokes. Why is the S so much more?

[Zeede]

I almost always drive by myself, or with one passenger, so I use the lower recommended number for my MC, which is 30 front, 30 rear. I check my tires every two weeks, and if they drop to 29.0, I'll pump them up to 31.0.

[DJC]

If you are running the 17" wheels, try 32PSI all round, it works for me. Damian.

[NEMINI]

open your door and look on the body for the tag with pressure recommendations you should always follow manufacturers recommendations, not what is printed on the tire itself.

[jasonfields007]

whats the best pressure to have with 16" on the cooper s

[HarryHBMCC]

As people have said above, this information is available on the tire placard. Generally 30PSI for light loads, 35 for full loads or 33 if you just want better handling with a light load. 30PSI is 2 bars, 35PSI is about 2.5 bars, IICC.

Harry

[SteveM3]

Tire pressure needed varies due to production tolerances in tyres, weight of
the car and driving style. It is also influenced by temperatures and the fact that
guages are rarely pin point accurate. However in the long term there is a real
simple way to tell. Get a tread depth guage and check your tyres every few
thousand miles. If the tyre is losing tread fastest on the outside your tyre is
underinflated and you should try a higher pressure. If the tyre is losing tread
fastest on the inside your tyre is overinflated and you should try a lower
pressure. If tyre wear is uneven side to side then get your suspension
checked. When you have even tyre wear it means the whole tyre is being
used which will gives you the best mileage and the most grip .

[Minimum]

I was driving in a parking garage recently. While making a hard right turn, I heard rubbing. When I got home, I couldn't see anything and eventually checked the pressure. They varied between 23 and 25 pounds all around. I have the 195/55/16 run-flats. I think I'll check the pressure a little more often.