tire pressure help/ M5

[jackaroo]

I'm new, and I now own a M5. The quandry is tire pressure, any suggestions. I have anything from 30 to 48 lbs. suggested. Any help would be appreciated.

 

[wood_e]

I would think the owners manual would state correct tire pressures

 

[jackaroo]

thanks, but it has limited info.

 

[bahnstormer]

have u checked -
a. your gas flap
b. the driver's door frame - there is some info there about max weight

are u running oem wheels and tires?

call the dealer up =]
and just ask em =]

 

[lpquick]

I have explained this before, the vehicle tag on the drivers door is a starting point. Almost every time the ideal pressure is at or above this starting point up to to the max tire pressure listed on the tire. I run a chalk line across the tread, roll the vehicle and check the chalk line for a proper wear pattern. If it wears more towards the center of the tread, the tire is over inflated. I let out a couple of lbs and start it over again. If it's wearing towards the outside of the tread the tire is under inflated, I add a couple of lbs and again start over. When I find the correct pressure, I note it, front or rear and as long as I continue to use the same pressure gauge I'll be spot on. If the wear pattern is abnormal it indicates a possible rim out of round or some type of alignment that needs attention. This works as long as the vehicle weight is the same. I also forgot to mention, only do this on a cold tire.
This will get you maximum tread life and good traction. If your a little heavy footed, you might want to increase this pressure by 3-5 lbs in the rear for maximum traction during quick acceleration and a little less tread life.

 

[jackaroo]

m5 tire pressure

The reason I ask is;

1. duh, i don't know the answer

2. in th past I had K1200rs, motorcycle, and the inflation info was great; but, if you followed the instructions you ended up with cupped tires.

3. I thought I could get some valid starting point.

thanks for all the help. the end.

 

[geneo]

35 in front and 35 or 40 in the rear but dont go under 35 in front or rear thats what i set them at and get no complaints 40 may ride a little hard for you

 

[CosmosBlack]

I was told that the manufacturer's recommended psi is not good enough for low profile high performance tires. Rubber compound is soft and expands when hot, causing abnormal wear in the center of the tire as it bulges out. When cold, the rubber contracts and you can then see a "cupped" centerline in the tire where it's worn.

Then you wonder...wear on the center, means overinflation...but why is it cupped in?
Doesn't make sense at all...that's what happened to my Yokohamas, which are extremely soft. So, after all was explained to me, it makes more sense now.

Manufacturer's psi for my car: 30 front, 35 rear
Mechanic's suggested psi: 33 front, 40 rear

It is a little rough with the higher pressure, but I have new tires now and still got to see if this theory works. With a higher pressure, when the tire expands hot, the pressure holds the tire's shape better and minimizing the bulge, thus maintaining a flat contact surface to the road.

Anyway...we shall see...

 

[jackaroo]

5 series tire pressure/m5

Thanks for the response to the question. The majority of the people I seem to ask, say something along the lines of, "tire pressure, duh, I never worried about it." At least I have a couple of great idesa where to start. Thanks for everybodies input. There are so many variables involved, to the point of ..., that the answer is tough to answer.

 

[HornyHornet]

35 in front, 41 in rear.