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      02-24-2016, 08:45 PM   #1
Attym
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Another tire question

2009 328xi

I have have 4 same tires, contipro non-run flats.

(2) 8/32
(1) 9/32
(1) 7/32

Can I use this combo safely??

And in which order/combo? Was thinking the two 8/32 up front and the 7/32 - 9/32 in back.
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      02-25-2016, 11:30 AM   #2
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Quote:
Originally Posted by Attym View Post
2009 328xi

I have have 4 same tires, contipro non-run flats.

(2) 8/32
(1) 9/32
(1) 7/32

Can I use this combo safely??

And in which order/combo? Was thinking the two 8/32 up front and the 7/32 - 9/32 in back.
and by combo i mean:
Put both 8/32 tires together (front or back)
Put one 8/32 with the 7/32 and one 8/32 with the 9/32.

Or am I literally splitting hairs and over thinking this?
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      02-25-2016, 11:35 AM   #3
shadow191
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Probably overthinking it. You're well within the transfer case tolerance. Plus even if you had gotten new tires, they could have worn unevenly to the same tread depths you have now.
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      02-25-2016, 11:51 AM   #4
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Quote:
Originally Posted by shadow191 View Post
Probably overthinking it. You're well within the transfer case tolerance. Plus even if you had gotten new tires, they could have worn unevenly to the same tread depths you have now.
thank you for being the voice of reason.. I need that.
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      02-25-2016, 02:10 PM   #5
floydarogers
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Quote:
Originally Posted by shadow191 View Post
Probably overthinking it. You're well within the transfer case tolerance. Plus even if you had gotten new tires, they could have worn unevenly to the same tread depths you have now.
++
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      02-25-2016, 02:24 PM   #6
Attym
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So... at the risk of continuing to over think it... and know it doesn't matter.

What would be the best case scenario:

Both 8/32 up front and the 7/32-9/32 in back
Both 8/32 in back and the 7/32-9/32 in front
a 7/32 and 8/32 up front and 8/32 and 9/32 in back to "balance it a bit more"

and I'll bow out after this... than you for indulging my insanity.
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      02-25-2016, 05:21 PM   #7
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Quote:
Originally Posted by Attym View Post
So... at the risk of continuing to over think it... and know it doesn't matter.

What would be the best case scenario:

Both 8/32 up front and the 7/32-9/32 in back
Both 8/32 in back and the 7/32-9/32 in front
a 7/32 and 8/32 up front and 8/32 and 9/32 in back to "balance it a bit more"

and I'll bow out after this... than you for indulging my insanity.
I'd put the 9/32 on right rear (that wheel/tire wears a bit faster than the others due to drivetrain geometry), one of the 8/32 on the left rear, and the others on the front. Generally, you want newer tires on the rear to prevent hydro-planing - see tirerack.com's tech articles.

Probably won't matter, but there's some logic to that arrangement!
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      02-25-2016, 08:17 PM   #8
Attym
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Turns out I have (3) 7/32 and (1) 8/32

Much better and I'll take your advise to throw the 8/32 on the rear right.
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