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[NJ335xi]

I decided to keep my rims and sell my run flats.

I purchased Goodyear Eagle F1 All Seasons tires. I bump the profile up 5 to 225/45/18 front and 255/40/18 rear. More tire between the rims and the road. The profile is higher by 1/2" or a full inch in diameter front and back.

The tire tread is a full inch wider because these tires are a little more square.

They ride great, no issues. I have seen only a slight (3%) mile per hour difference from Speedo to actual.

Here are the stats on the F1s compared to the OEM. They are better all around and last 3 times longer.

Tire______Tread Wear ___Traction____Asphalt Gs ___Concrete Gs
F1_________400__________AA__________0.54_______0.4 1
BS RF______140___________A__________ 0.47_______0.35

HR springs are next!

What do you think?

[Rt66er]

Considering the speedo is off about 5% from the factory, your speedo will actually be more accurate now! I have considered doing this just to counteract a most of the built-in speedo error.

[TofuTurkey]

I hope the front won't rub when you drop it...

[Alexxxx]

Your post is very helpful me I have the same car BMW E92 193 rims tire package I run flat and I want to make the same change - Non Run Flat tires 225 45 r 18 91w or y -255 40 R18 95W or y ! You think we bonding problem? Thank you

[spac3]

Originally Posted by adamalexxx

Your post is very helpful me I have the same car BMW E92 193 rims tire package I run flat and I want to make the same change - Non Run Flat tires 225 45 r 18 91w or y -255 40 R18 95W or y ! You think we bonding problem? Thank you

Did you end up running 225/45s? Curious if there's rubbing issues

[sendan]

Sorry to bump an old thread....but I went to Discount Tire to get the same arrangement for my 2011 335XI (225/45/18 and 255/40/18) and they said it was greater than a 3% diameter variance to the OE size (225/40 and 255/35) and they wouldn't install that size on the car.

Any feedback on this?

[meyergru]

While it is true that a diameter difference between front and back must not exceed 3%, the resulting 4% increase all-around is not between front and back und thus is not critical for DSC or ABS.

The consequences of the diameter change have been discussed before. Basically, there is a max speed increase and the speedometer becomes more exact. Apart from this, there could be rubbing issues, but there aren't any, even less with an E90. In the EU, you even have to get approval for this and I got it.

I don't know for sure with an X-Drive, though.

[SpeedBuggy]

Originally Posted by sendan

Sorry to bump an old thread....but I went to Discount Tire to get the same arrangement for my 2011 335XI (225/45/18 and 255/40/18) and they said it was greater than a 3% diameter variance to the OE size (225/40 and 255/35) and they wouldn't install that size on the car.

Any feedback on this?

Should be less than 1% Rolling Diameter, anything greater will play havoc with the x-drive. Not sure about ABS / DSC but would think problems would exist with the difference front to back.

225/40/18 at the front, 255/35/18 at the rear gets you 0.227% difference in rolling diameter.

[tcphoto]

Why do new members post to dead threads?