[nwills]

A lot of wheel places I've been to lately have recommended to go with 235/35/20 - 275/39/20 for my new Vossen 20" rims.

I prefer going with 245/285. From some of the reading I've done here it seems a lot of the 20" setups here are running wider tires.

Is there any reason I'm being suggested to go with the 235/275? Any differences or potential issues with going wider...I have an xDrive.

[wdimagineer]

These dimensions keep the rotation speed within spec to not damage your differential or other components of the xDrive system. It's what BMW prescribes on their accessory wheels. Anything wider/larger might have a negative effect and could void your warranty.

I'm using these same dimensions on my incoming HRE wheels.

[nwills]

Originally Posted by wdimagineer

These dimensions keep the rotation speed within spec to not damage your differential or other components of the xDrive system. It's what BMW prescribes on their accessory wheels. Anything wider/larger might have a negative effect and could void your warranty.

I'm using these same dimensions on my incoming HRE wheels.

Today at the dealer I saw a 650 with 245/275.

I've spent a lot of time checking out as many wheel posts as I could find and it seems like a majority of 20" setups go with 245/30/20 - 285/35/20.

Others go with 295 on the rear and some go with 40 and 45 all around for pothole protection!

I guess there is no one way to do this!

The problem with 235/275 is that without spacers the wheels will not sit flush with the car. I would think the extra width would help a little with that?

[E90Fleet]

Originally Posted by nwills

and some go with 40 and 45 all around for pothole protection!

Changing the profile like that will make the speedo read wrong as you are changing the tire diameter.


The BMW approved sizes are 245/35/20 and 275/30/20

[dunderhi]

Originally Posted by E90Fleet

The BMW approved sizes are 245/35/20 and 275/30/20

Yes, but 245/35/20 & 285/30/20 or 235/35/20 & 275/30/20 have nearly identical tire diameters which would be best for an xDrvie. Since xDrives are more likely to understeer, a staggered setup won't help performance-wise, but it does look nicer.