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  #1  
Old 09-02-2021, 04:44 PM
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Wheel fitment question

I'm sure this has been answered, but the search feature is blocking some words and I can't find a thread specifically answering this question...

I have an '08 E70 4.8i, which I don't believe has the sport package. I just picked up a set of the 214 wheels from a 2010 X5 (20x10 and 20x11) but can't tell if they will cause any issues from the non-staggered that I currently run.

Does anyone know if the sport package changes something specific that makes the staggered wheels work, or will I be fine using them?
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  #2  
Old 09-02-2021, 07:17 PM
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Just make sure the diameter of the installed tires are the same front to rear. With the wider, lower profile on the back on the wider wheels.

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Old 09-03-2021, 01:00 AM
ard ard is offline
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Pretty sure the E70 didnt change hub sizes, so will be OK


As above, make sure your OD is matched (or better yet, the Revs per Mile is within 1%. If one is, say, 796.... the other should be 788 to 804)


(You keeping them squares for winter snows???)


Oh, search here can be screwy.... Consider using google with "site:xoutpost.com" added- all results will be from here.
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Old 09-03-2021, 11:07 AM
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Quote:
Originally Posted by wfwright2 View Post
Just make sure the diameter of the installed tires are the same front to rear. With the wider, lower profile on the back on the wider wheels.

Sent from my SM-T377V using Tapatalk
Just measured them/rolled them up against the current wheels and confirmed the overall diameter is the same. And you're just saying wider wheels in the back, correct?
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Old 09-03-2021, 11:14 AM
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Quote:
Originally Posted by ard View Post
Pretty sure the E70 didnt change hub sizes, so will be OK


As above, make sure your OD is matched (or better yet, the Revs per Mile is within 1%. If one is, say, 796.... the other should be 788 to 804)


(You keeping them squares for winter snows???)


Oh, search here can be screwy.... Consider using google with "site:xoutpost.com" added- all results will be from here.

Okay thank you, yeah the offset was my other potential concern, but knowing the diameter is the same and assuming there were no hub differences it shouldn't cause issues.. Unless there is something in the rear diff. that was changed? IDK. Not sure how to measure the revs per mile though if that is something fairly easy to do.

But yes exactly, will be getting some blizzaks or something for the current 18's for winter, and summer/all-season performance for the 20's after I have them refinished and powder-coated. Picked up the set for $400 (3 decent tires, one needs to be replaced), so may just replace the one tire for now after seeing how expensive the new tires are haha.

And that is a good call, I should've thought of that - Always frustrating when you're looking up something specific and the term is too short so is ommitted...
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  #6  
Old 09-04-2021, 10:01 PM
ard ard is offline
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duplicate...

Last edited by ard; 09-09-2021 at 11:18 PM.
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  #7  
Old 09-04-2021, 11:42 PM
ard ard is offline
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Eyeballing them by 'rolling up next to each other' is WHOLLY inadequate....



*YOU* dont measure them. YOU go to tire rack and - for each specific tire/brand/model- you look up the "specs".





Keep in mind that an "OD" isnt loaded (ie weight of the car on the tire) whereas the 'revs per mile' includes deflection when the tire is loaded.



Mismatch in the revs/mile is precisely what the differential 'sees'.. too much, it is damaged.
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Old 09-09-2021, 01:56 PM
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Quote:
Originally Posted by ard View Post
Eyeballing them by 'rolling up next to each other' is WHOLLY inadequate....



*YOU* dont measure them. YOU go to tire rack and - for each specific tire/brand/model- you look up the "specs".





Keep in mind that an "OD" isnt loaded (ie weight of the car on the tire) whereas the 'revs per mile' includes deflection when the tire is loaded.



Mismatch in the revs/mile is precisely what the differential 'sees'.. too much, it is damaged.
So I went on to Tire Rack, looked up the revs/mile on the current 18's tires and the tires mounted on the 20's, and found it's 713 on current 18's, and 726 on the 20's. So if I understand correct, that's a 1.8% difference (13/713). Is that much of a mismatch going to be a problem?
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Old 09-09-2021, 11:20 PM
ard ard is offline
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Quote:
Originally Posted by sleepybear View Post
So I went on to Tire Rack, looked up the revs/mile on the current 18's tires and the tires mounted on the 20's, and found it's 713 on current 18's, and 726 on the 20's. So if I understand correct, that's a 1.8% difference (13/713). Is that much of a mismatch going to be a problem?

It isnt the mismatch between "the old tires' and 'the new tires' that matters....


its the mismatch between front and rear







Clear?
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  #10  
Old 09-09-2021, 11:56 PM
ard ard is offline
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And just checking, you are using the same size tires, front and rear- but on 'staggered' rims, two different widths?


There is a THEORETIC difference in OD with a tire that is on a different width. The tire flexs, but I think it MIGHT impact rolling diameter. Id do it, probably not that much. But just FYI
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