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      08-02-2014, 06:59 PM   #23
theaudir8fan
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Quote:
Originally Posted by Don N. View Post
295/35/20 front, 335/30/20 rear.

The difference between front and rear is 2.75mm with this set up.

Unless that minor difference is enough to affect the xdrive, I would figure that minor difference would be negligible. Natural tire wear between the front and rear tires would probably be more than that.

-Don
I think the point the others are trying to make is the difference in rotational mileage, 726RPM is OE with front and rear being the same. the tires that you got are 717 front and 744 rear, our cars aren't designed for this and it may hurt the car down the road
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      08-02-2014, 07:51 PM   #24
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Quote:
Originally Posted by theaudir8fan View Post
I think the point the others are trying to make is the difference in rotational mileage, 726RPM is OE with front and rear being the same. the tires that you got are 717 front and 744 rear, our cars aren't designed for this and it may hurt the car down the road
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      08-02-2014, 08:19 PM   #25
Don N.
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Understood, but if there was actual values or numbers that proved that, it'd be more convincing.

I'm coming from cars that ppl's mentalities that you couldn't run 18" wheels on cars that came with 17" wheels from the factory.
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      08-02-2014, 10:06 PM   #26
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Personally (and that's all this forum is about) I love the dunlop sport maxx runflat tires. I've had X5 with 18" all season runflat, 19" M sport runflat, 20" Bstone sports, and these.

In between I've tries the Nitto non runflat and also changed in 3 diff sets of winters (or was it 4??). I've got to say that the dunlops are the best. The Nittos felt like jello in comparison. Call me crazy but I'll take the firm ride and responsiveness every time over those.

Now I have 21" style 239 with runflat winter Pirellis to try this winter unless someone takes them from me. Another test!!
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      08-02-2014, 10:09 PM   #27
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Quote:
Originally Posted by Don N. View Post
Understood, but if there was actual values or numbers that proved that, it'd be more convincing.

I'm coming from cars that ppl's mentalities that you couldn't run 18" wheels on cars that came with 17" wheels from the factory.
Going up or down in rim size is one thing, but having mismatched front and rear rolling diameters is a horrible idea on any AWD vehicle.

As I alluded to in my original post, and as theaudir8fan more explicitly pointed out, the disparity between your front and rear is pretty dramatic. Feel free to check out the specs for yourself.
http://www.tirerack.com/tires/tires....ilot+Sport+PS2

If it were me, I'd be pulling those tires off tomorrow and putting on some OE sizes.
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      08-03-2014, 04:10 AM   #28
Don N.
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How much variance can there be between front and back, is it 1% or 3%? What about vs the factory diameter size?
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      08-03-2014, 07:57 AM   #29
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Quote:
Originally Posted by Don N.
How much variance can there be between front and back, is it 1% or 3%? What about vs the factory diameter size?
BMW will tell you there is no variance allowed.

Anyone else is just guessing.
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      08-03-2014, 09:50 AM   #30
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Quote:
Originally Posted by Don N. View Post
How much variance can there be between front and back, is it 1% or 3%? What about vs the factory diameter size?
Don, are they really 335's or was that actually a typo and they are 315's. If they are 315's then you are good, but 335's and if it was me, I'd rather not chance destroying my drive-train.

Harry
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      08-03-2014, 04:39 PM   #31
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Quote:
Originally Posted by Don N. View Post
How much variance can there be between front and back, is it 1% or 3%? What about vs the factory diameter size?
The traction control light will come on if there is a variance between front and rear tire sizes and the vehicle's computer may retard performance, thinking there is a flat tire.
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      08-06-2014, 05:39 PM   #32
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Slightly off topic.... I replaced my rft's with DWS. They were great in snow, rain etc. slightly smoother ride. But the road noise is pretty loud. Louder than the run flats. They are balanced and rotated, but the noise is really bad...any thoughts
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      08-08-2014, 02:34 PM   #33
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Ordered a set of Nitto Motivo.

Currently running a set of the Dunlop Sport Maxx RFT's and they are junk. Poor ride, one wheel cracking along the tread (never seen this), along with being heavy and poor wear.

Ordered the spare tire kit from getbmwparts as well for insurance.

I drive the X5 like my car so we'll see how the new tires perform in comparison.
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      08-27-2014, 09:20 AM   #34
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Put 3000miles on my new Motivos; Way better than the RunFlats!
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