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The Tire Rack's Tire & Wheel Forum
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Old 07-19-2016, 10:35 AM   #21
CharlieFoxtrot
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Quote:
Originally Posted by BKMrSteel View Post
Took a road trip with that tire setup, encountered some bad roads along the way, and I blame the low profile for having replaced two wheels after.
I'd sooner blame the distortion of the tread/sidewall/rim relationship due to the stretched fitment. Properly fitted tires will have tread rubber and structure protecting the rim under most impacts. Stretched tires will theoretically let the tread structure tuck up between the beads, leaving nothing but the sidewall between the edge of a pothole and your wheel rims.





Fence, I'm sure some people drive hard enough to find understeer on public roads. I did that kind of thing when I was a teenager, though my cars back then had much lower limits than our E46s.... These days, it'd have to be a serious emergency situation for that to happen.
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Old 07-19-2016, 10:36 AM   #22
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What would be the stock tire size you guys recommend for the front wheels, 7.5x17? I need to change the tires I have on ASAP cause it tramlines so bad
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Old 07-19-2016, 10:43 AM   #23
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BTW, I'm very happy with my square 245/8.5" setup and new alignment specs so far. Drove from FL to NY with no tramlining or other complaints on the highway. I've got 36psi all around. Now I can rotate the tires, and it looks subtly cooler.

It was a real challenge to find a pair of decent 8.5" rears to use in the front. Took a year of periodic Craigslist searching in 3 major metro areas. I ended up buying a staggered set of 4 in FL, but the price was close to what I'd have gladly paid for just a pair. SO now I have four 7.5" wheels in storage in FL.
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Old 07-19-2016, 10:48 AM   #24
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stock tire size
That's the words, right there. 225/45/17. Quality brand tires. Suspension parts in good condition, good alignment job done by a guy who knows BMWs, just a hair of toe-in and minimum negative camber.
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Old 07-19-2016, 04:43 PM   #25
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That's the words, right there. 225/45/17. Quality brand tires. Suspension parts in good condition, good alignment job done by a guy who knows BMWs, just a hair of toe-in and minimum negative camber.

How much do run flats contribute to tramlining? Didn't realize my tires were way off
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Old 07-19-2016, 04:56 PM   #26
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How much do run flats contribute to tramlining? Didn't realize my tires were way off
What are your tire specs for the rears? If your fronts are 205's you should have 205/50/17(D=25.07) not 205/45/17(D=24.26)
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Last edited by zander271; 07-19-2016 at 05:02 PM.
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Old 07-19-2016, 05:21 PM   #27
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We're in a style 68 thread and his sig pic shows style 68 wheels. That means on a non-M3 he should have 225/45 and 245/40 on 7.5 and 8.5" wheels.

Razor, my computer just flushed the longer response I wrote. Short version is, runflats do contribute, even with correct fitment. You should be able to find plenty of online comments to that effect, including that specific tire model on BMWs. With wrong fitment they probably contribute more. You've got several things wrong, start fixing them and it can only get better.

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Old 07-19-2016, 05:28 PM   #28
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We're in a style 68 thread and his sig pic shows style 68 wheels. That means on a non-M3 he should have 225/45 and 245/40 on 7.5 and 8.5" wheels.
I know its a style 68' thread. I asked because he commented about having the wrong size tires. Having a large mismatch in tire size between front and rear would cause some weirdness.
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Old 07-19-2016, 06:41 PM   #29
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What are your tire specs for the rears?

OK, I can see your point about different front/rear sizes.



Quote:
Originally Posted by zander271 View Post
If your fronts are 205's you should have 205/50/17(D=25.07) not 205/45/17(D=24.26)

But you threw me off with this. He "should" not have 205s at all, so the aspect ratio question is moot.
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Old 07-20-2016, 12:52 AM   #30
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Style 68 wheel and tire questions

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Originally Posted by CharlieFoxtrot View Post
OK, I can see your point about different front/rear sizes.













But you threw me off with this. He "should" not have 205s at all, so the aspect ratio question is moot.

Diameter of the tires is very important. Depending on the ratio difference the front wheels would be doing more rotations.
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Last edited by zander271; 07-20-2016 at 12:55 AM.
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Old 07-20-2016, 07:54 AM   #31
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What are your tire specs for the rears? If your fronts are 205's you should have 205/50/17(D=25.07) not 205/45/17(D=24.26)
The rears are Michelin Primacy MXM4 225/45. I bought these wheels with the tires on them. I wanted to know the stock/OEM tire size to get rid of tramlining and so it can be OE spec

Quote:
Originally Posted by CharlieFoxtrot View Post
We're in a style 68 thread and his sig pic shows style 68 wheels. That means on a non-M3 he should have 225/45 and 245/40 on 7.5 and 8.5" wheels.

Razor, my computer just flushed the longer response I wrote. Short version is, runflats do contribute, even with correct fitment. You should be able to find plenty of online comments to that effect, including that specific tire model on BMWs. With wrong fitment they probably contribute more. You've got several things wrong, start fixing them and it can only get better.
Yeah they aren't the right tires...they're run flats and the wrong size which makes it hell to drive
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Old 07-20-2016, 02:12 PM   #32
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The rears are Michelin Primacy MXM4 225/45. I bought these wheels with the tires on them. I wanted to know the stock/OEM tire size to get rid of tramlining and so it can be OE spec



Yeah they aren't the right tires...they're run flats and the wrong size which makes it hell to drive
Yea get the correct size tires on your car and report back.
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Old 07-20-2016, 03:12 PM   #33
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Yea get the correct size tires on your car and report back.
I got the stock front tire size what about stock rear 8.5x17?
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Old 07-20-2016, 04:42 PM   #34
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...he should have 225/45 and 245/40 on 7.5 and 8.5" wheels.
quoting myself....
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Old 07-20-2016, 05:57 PM   #35
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quoting myself....

Oops. Thanks for your competence
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Old 08-08-2016, 10:54 AM   #36
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To all owners of staggered style 68s: what size rim is your spare wheel?
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Old 08-09-2016, 09:08 AM   #37
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I have a mini spare. It works to get me to a Dis**** Tire but I rarely take trips in this car.
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Old 08-09-2016, 01:37 PM   #38
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Everything I've read says 7.5" for the spare. FWIW. I have a donut...
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Old 08-18-2016, 09:07 AM   #39
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Everything I've read says 7.5" for the spare. FWIW. I have a donut...
Gotcha thanks again
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Old 03-23-2017, 12:33 PM   #40
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So what sizes did u end up going with? Also, for the guys that are running the 17x8.5" square set up can u run a 255/40 tires on the front without a spacer?
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