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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > 235/35R19 [Front] 275/30R19 [Rear]



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      04-10-2010, 12:34 PM   #1
awestland
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235/35R19 [Front] 275/30R19 [Rear]

Hi All,

I've got an 06 330xi and from everything I've learned so far about the x-drive differential (+/- 1%) and the pre-lci E90 tire spacing, I'm fairly confident that these will fit using standard E9X offsets (35-37). The thing is, I haven't been able to find anyone else running this setup and I can't seem to figure out why.

Based on the tire calculator at 1010tires.com this setup provides the most equal front/back rolling diameter out of any other setup.

It only has a 0.08% difference.

For reference, the more popular 235/35R19 [Front] 265/30R19 [Rear] has a rolling diameter difference of 0.87%

My question is; Why haven't more people gone with the 275 in the back vs the 265? I figure that the closer to 0.00% diameter difference the better, or does it not matter as long as it's below 1%?

Any insight would be great.

Thanks,
Adam Westland
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      04-10-2010, 12:58 PM   #2
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mines not an xi but im running that setup search my name
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      04-10-2010, 12:58 PM   #3
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That is the set I use. I have a slight rub every now and then on the drivers rear. No biggie. I think others stick to 265's because of the slammed drops their cars have.
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      04-10-2010, 01:43 PM   #4
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I have that on my e90 with no rubbing. Make sure to not just use the calculator and check the actual specs from the manufacturer. Tire rack has all the actual dimensions on the site. Actual diameter sizes can vary as much as 1/2" on any given size.
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      04-10-2010, 01:59 PM   #5
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My 335i X Drive has 235/35 and 265/30. I opted for the 265 over the 275 for less rub potential.
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      04-11-2010, 05:45 PM   #6
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Im running that setup on my 2007 e92 xi. I went with it solely because of % difference, which is zero so it sounded goo to me. When I would have 2 passangers in my back seat I would rub occasionally, but nothing too bad. I have recently dropped my car on H&R sport springs, and had my fenders rolled. Depending on your offset you may not even need to roll the fenders if you are going to drop it.
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      04-12-2010, 12:18 AM   #7
Nikolas
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Again, check the actual tire specs, as it will not always be a "zero" difference, depending on the manufacturer.
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      04-12-2010, 05:39 PM   #8
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Here's how is usually is
265: no rubbing, difference in % is still below 1, which people seem to adhere to for some reason
275: rub potential, but easiest on transfer case. I also believe that even that little bit more sidewall gives you more rim protection.

I have the 275's in michelin ps2 (extremely square) out back with a small fender roll and am very glad I went with the wider size.
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      04-12-2010, 06:17 PM   #9
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Should be fine with 275/30. Lot's of non-xdrive guys run that in the rear (Vuduforu2 is one off the top of my head, he runs Vredesteins)
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      04-12-2010, 10:40 PM   #10
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I have 235/275 19" RE760S and have not rubbed yet on stock suspension. I think it will be close and may need a roll when I drop on V1's. Wheels are SF71 8.5/9.5 ET35.
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      04-12-2010, 10:40 PM   #11
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my lc dynas on my e92 xi are F:19x8.5 et30 w/ 235/35/19's & R:19x10 et37 w/ 275/30/19's

I'm not lowered but i know i'll rub when i do. But I already plan on rolling my fenders so it doesn't matter.
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      04-13-2010, 08:38 AM   #12
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Interesting, because it's the opposite with 18" tires. 235/265 is <1% and 235/275 is >1%.
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      04-14-2010, 09:39 AM   #13
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I've been running 235/35, 275/30 (19x10 in the rear) with no rubbing at all on toyo T1R's on my XI dropped with v3's.
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      04-18-2010, 07:50 PM   #14
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JPSimon,

What is the size of your front Forgestar's.

I just got the same size as yours in the rear and am running the same tire size too.

**********s rec'd that I run 245/35 in front (19 x 8.5). Anyway, just curious because I've had major tracking issues to the right even after two different shops have attempted to align my vehicle.

On the old sport wheels/runflats w/ eibach/koni fsd, it used to track super straight.

Did you get a Camber kit, or, have any similar experience?

Thx
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      04-03-2012, 09:12 AM   #15
JTWCT
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Does anyone run spacers on with that setup? 235/35R19 [Front] 275/30R19 [Rear]

I plan on keeping my E92 328xi on stock suspension. Thanks!
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      04-03-2012, 09:45 AM   #16
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im lowered on HR sports, im running 235-35-19 fronts , 265-30-19's rear..
i do want to upgrade rears to 275 because of the circumference differents. its better on the transfer case clutches. if you guys wanna save money, i would upgrade rears to 275. but then the thing is, i do not want my fenders rolled.. and i will rub on 275's -.-
willing to trade my 265-30-19 rears almost brand new Hankook v12's for 275 rears in the east coast local =)
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      04-03-2012, 09:46 AM   #17
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i wouldnt recommend spacers.....

Quote:
Originally Posted by JTWCT View Post
Does anyone run spacers on with that setup? 235/35R19 [Front] 275/30R19 [Rear]

I plan on keeping my E92 328xi on stock suspension. Thanks!
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      04-03-2012, 09:53 AM   #18
JTWCT
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Quote:
Originally Posted by 335xi Stunt' View Post
i wouldnt recommend spacers.....
I was talking to a guy that ran 12mm spacers on the front wheels for this"
235/35R19 w/ 19 8.5 ET35
275/30R19 w/ 19 9.5 ET35
Stock E92 xDrive suspension

He said that it helped with under/oversteer. Why wouldn't you recommend spacer? I'm just trying to figure out what's best. I'd rather not spend extra money on spacers unless it makes a difference.
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      04-03-2012, 09:57 AM   #19
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it wasnt recommended by my bmw tech who helped me pick my tires for the xi.
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      04-03-2012, 09:58 AM   #20
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its basically running a more aggressive offset. make sure you know what your doing with the offsets so you dont fry your transfer case =)
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      04-03-2012, 10:57 AM   #21
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running 235/275 lowered. rolled my rear fenders and havent rubbed once.
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      04-03-2012, 03:18 PM   #22
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What rim widths are you running with? Anyone has 9 in the front and 10 in the rear?
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