Cream Sauce

Hello everyone,

Regarding my previous topic about tyre replacement and reverting from Run-Flats to conventional tyres in the end I have decided to go with run-flats due to in my opinion the benefits outweighing the disadvantages and as I can see run-flats are much safer for me and my family.

Anyway back to my original question there is one thing that has been stuck on my mind regarding an email I recieved from BMW

I went and checked the size on my vehicle and I have 245/40 for front and rear.

My car is a 2006 525D M-Sport, what tyre sizes does everyone else out there have ? do I have the wrong setup installed by any chance ?


Thank you in advance for you replies
Kind Regards,
Cream Sauce

mustafa550i

On my 2007 550i, the rear tire sizes are wider than the front ones. Hope this helps!!

Cream Sauce

Definitely! thank you for your input.

I guess the reason your rear tire size is wider is because you have a 5000 engine. Maybe on the 525D's they don't put wider tires on the rear they just put the same as the front, we shall see!

crusher1

I have a 2004 525d Sport and have the same tyre set up as you all round:- 245/40/18

Cream Sauce

Thank you very much also.

Just recieved an email from BMW again

So I guess I was quoted wrongly in the original email, with the larger engined 5 series the tyres at the back are wider due to the fact that the E60 is rear wheel drive and because they have more power = wider wheels I guess.

crusher1

I agree with you on that my 330d E46 was set up wider at the rear. I'm just struggling to find the correct pressures for front and rear, do you happen to know?

Cream Sauce

I believe it is 2.4 on the front and 2.9 on the rear.

crusher1

Thanks, seems a big gap that. 42 psi on the rear 34psi front?

Cream Sauce

Also if you check on the inside of the door sill it should tell you different tyre sizes and rim sizes tyre pressures.

Cream Sauce

Not sure about the psi values, however as far as I can remember from reading the figures on the door sill they are the ones which I have mentioned for our tyre size and rim setup. I shall check tomorrow and confirm it tomorrow.