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[gobo335i]

I run 19" CSL's on Excta Rubber and am not finding definitive answers to tire pressure.

On the forums I see 35psi F and 38psi R, I see 40psi F and 44psi R....

I looked at my brothers 2005 M3 with CSL's and his car says to run 41psi F and 48psi R!

I hear on a track the best is to run 35psi F&R cold and adjust to 40psi after the tires are nice and hot.

So whats the call? Are all tires different? Is this a case of "adjust till they feel right"? Does the European model on 19" without RFT's have specs to follow?

I am running 41psi F and 46psi R currently as the max pressure is rated at 50psi for all.

I know...I searched. After finding so many different answers, I was hoping an authority would offer some help.

Note, I am searching for pressures for running hard on the street and twisties, not drag racing.

Thanks!

[giddyup69]

why wouldn't you just follow the specs from bmw?

[gobo335i]

Now why would someone want to do a thing like that?

From the manual huh. I read the thing cover to cover and don't remember seeing a chart that included my tire sizes.

Nice.

[E92Fan]

Wait - the BMW chart assumes you're using runflats.

If you're on non-RFTs, consider using the Alpina settings on 19" wheels - 2.6bar at the front, 2.7bar at the back (37psi, 39psi)

[montreal_bimmer]

i've heard that there is a bit of an advantage in handling with going with slightly more pressure up front than in the rear... if i'm not mistaken, BMW.WillimsF1 team was doing this in 2003, when they came close to winning a championship....

[E90330iS]

41/49 too much for 19" wheels?

[John 070]

Originally Posted by giddyup69

why wouldn't you just follow the specs from bmw?

I'm with you. Instead of 35/32, BMW could say 40/37, and people would still add 5-6 lbs. because BMW obviously underestimates their numbers....

[gobo335i]

I was told by a professional that you add 2lbs for every inch over the 'stock size' your tires are. Therefore, if your door sticker says 35 front and 34 rear, and you had 'stock' 18's, and now 19's, your pressures would be 37 and 36 respectively. Using this method, my 19's and tires have worked perfectly and worn perfectly for 25,000 miles. I am content that this is a good method.

Of course, if you go to a track, then this is all out the door as the tires heat up way more than they ever would on the street. In that case I would start lower and let them heat up. Or use nitrogen

[Dan335i]

My 07 335i coupe with sport package (189 w/REOA50 rft) says in the door to run 32ft and 35 rear.I run 34 and 37 and it feels much better all around driving.