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Old 05-06-2016, 09:37 AM   #1
juan88
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Will staggered wheels ruin awd?

Hi everyone, I'm trying to run a set of staggered style 67 m3 wheels on my 2003 325xi wagon. I've done a lot of research already and I've gotten mixed reviews about whether it can be done with out ruining the transfer cases. So first off the wheels fits perfectly fine the car, I did about 15 miles on them on back roads here in new Hampshire (lots of bumps) and no rubbing or understeering so they fit and perform well. My issue is that with the current tire set up of 225/40/18 front and 245/40/18 rear, there a circumference difference of about 1.5 inches and much bigger than the stock circumference. I've found a tire set up that will make it so that both front and rear circumference will be with in .2 inches of each other and both will be with in .8 inches of the stock circumference. Will this set up work with out destroying my transfer case? Also I will only be running these for about 5K miles a year during the summer, the rest of the time it will have stock wheels. Thanks for any input on this I will take any and all advice I can get before going through with this mod

Last edited by juan88; 05-06-2016 at 09:39 AM.
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Old 05-06-2016, 10:34 AM   #2
rsyed07
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You do know that the offsets on rear of style 67 wheels are really low and will need fender modification and tire stretching to get them to fit right? Most people but 4 front style 67's since the offset matches that of a non-m.
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Old 05-06-2016, 10:44 AM   #3
juan88
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I am aware of all of that but your wrong about the fender mods and tire stretching. They fit great and ride great there's no rubbing what so ever. My only question is whether they will ruin the transfer case over time with the very slight difference in circumference between the back and front wheels. Thank you for your response any way.
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Old 05-06-2016, 10:59 AM   #4
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it theoretically will mess up the AWD. how bad will it realistically be? it's hard to say but it should ruin the transfer case over time.
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Old 05-06-2016, 03:26 PM   #5
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I wouldn't run such a big difference at all. .2 inch, sure. 1.5? Not a chance in hell.
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Old 05-06-2016, 04:05 PM   #6
juan88
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.2 inches is going to be the difference in diameters between front and back with the new tire set up I'm looking at. It's a small difference but I'm leaning towards not taking any chances and getting two more front rims and matching all 4 wheels up. Just way more expensive than I'd like it to be but oh well. Thanks for the feed back from everyone it was much appreciated
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Old 05-06-2016, 04:17 PM   #7
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Commonsence says it will cause damage. At what pace nobody knows but you seem hellbent on doing it anyway. Go for it and report back.
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Old 05-06-2016, 04:31 PM   #8
Yewzer B Lewzer
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Will staggered wheels ruin awd?

Quote:
Originally Posted by juan88 View Post
.2 inches is going to be the difference in diameters between front and back with the new tire set up I'm looking at. It's a small difference but I'm leaning towards not taking any chances and getting two more front rims and matching all 4 wheels up. Just way more expensive than I'd like it to be but oh well. Thanks for the feed back from everyone it was much appreciated

Diameter? or circumference as you stated in your first post? 0.2 circumference isn't much, tire wear could do that easily.

Probably not rubbing because Xi sits higher and it would take some serious situations to get the tire deep into the fender.
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Old 05-06-2016, 07:28 PM   #9
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I'm sure the snow tires on my xi have a slightly different diameter between front and rear due to the rears being newer and everything is still working fine. Open difs probably help.
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Old 05-20-2016, 02:01 PM   #10
juan88
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Quote:
Originally Posted by Yewzer B Lewzer View Post
Diameter? or circumference as you stated in your first post? 0.2 circumference isn't much, tire wear could do that easily.

Probably not rubbing because Xi sits higher and it would take some serious situations to get the tire deep into the fender.
Yes I meant circumference. I'm looking at 225/40/18 on the fronts and 255/35/18 on the rears. According to the tire calculators online, I've checked numerous ones, this set up will have that .2 inch difference between front and back in circumference, with roughly 8 revolutions per mile between the front back. Does any one know how accurate these tire calculators are? And does anyone with knowledge of the awd drive system know if the slight difference is going to ruin the transfer cases?
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Old 05-20-2016, 02:27 PM   #11
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They're accurate. It's pretty simple math. I have an excel one that I made and it agrees with most of the sites I've found.

Personally, I would not have staggered tires on an AWD car. Check the owners manual to see if it has a note about that.
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Old 05-20-2016, 03:44 PM   #12
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Manufacturers recommending to replace all 4 tires at once on AWD cars should tell you something. Even tire wear differences will negatively impact the life of you transfer case.
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Old 05-20-2016, 04:28 PM   #13
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I don't know why anyone would say the the rears of style 67 wheels would fit a non-M car and look nice. Sure, it does fit physically but sticking out over an inch? I physically tried it on my zhp coupe (wider fender and more negative camber compared to non-zhp) and it looked awful. It rill rub unless you're car is sitting high like a truck/suv.

Also, there must be a reason why no AWD cars, except exotics or super cars, have a staggered wheel setup.

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