Tire pressaure with 18" R tires? - The Unofficial BMW M5 Messageboard (m5board.com)

Qvarnis · 2nd April 2003, 23:46

What tire pressaure for trackdays with Yokohama Advan 048R?
Front 265/40-18", 9" BBS RC II rims.
Back 285/35/18", 10" BBS RC II.

The car is equipped with Ac Schnitzer DFC system.

Jocke Qvarnström
http://www.cityrace/dempa/q

HaroldC · 3rd April 2003, 02:37

I don't have any experience with the Yokos, but when I ran the Hoosiers (also an R-compound) I ran 41 psi in the fronts and 39 psi in the rears *hot*. Which means my starting temps were ~32 psi front and ~30 psi rear *cold*.

Since the M5 is so heavy, you need to run a little more pressure than with lighter cars. I wouldn't go over 42psi *hot*, the tires get very greasy and will not hold as well.

MIB · 3rd April 2003, 12:42

Quote:

Originally posted by Qvarnis
What tire pressaure for trackdays with Yokohama Advan 048R?
Front 265/40-18", 9" BBS RC II rims.
Back 285/35/18", 10" BBS RC II.

The car is equipped with Ac Schnitzer DFC system.

Jocke Qvarnström
http://www.cityrace/dempa/q

Thats an interesting combination of tyres Q.

Shouldn't you be running 35 series on the front with that width?

Dinan two recommendations are 265/35/18 Fr & 275/35/18 Rear

or 275/35/18 Fr and 285/35/18 Rear.

I'd Try 42.5 Fr and 37.5 Rear.

Qvarnis · 3rd April 2003, 12:51

Quote:

Originally posted by MIB
Thats an interesting combination of tyres Q.

Shouldn't you be running 35 series on the front with that width?

Dinan two recommendations are 265/35/18 Fr & 275/35/18 Rear

or 275/35/18 Fr and 285/35/18 Rear.

I'd Try 42.5 Fr and 37.5 Rear.

Now i'am unsure, maybe it is 35...?

Qvarnis

MIB · 3rd April 2003, 12:53

Quote:

Originally posted by Qvarnis
Now i'am unsure, maybe it is 35...?

Qvarnis

Stock is 245/40/18 Fr & 275/35/18 Rear.

But most when increasing the front width, drop back to the 35 Series.