06-09-2015, 10:13 AM | #1 |
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wider tires for M235i?
I believe that- especially after modding the N55 to the region of some 380 hp - the tire widths in the stock staggered setup of M345i are too small.
If I wanted to keep the wheels, would 245/35 R18 (stock rear) in front, and 275/35 R18 fir w/o rubbing? EDIT: oh, and BTW what are the stock rim widths in the staggered setup?
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just sold: 2013 F10 528i xDrive my AWD beater: 2015 Golf R mk7 DSG my RWD pirate & long-distance cruiser: 2015 M235i AT8, LSD Last edited by moldcad; 06-09-2015 at 10:21 AM.. |
06-09-2015, 11:40 AM | #2 |
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Oops... Considering the stock wheel widths of 7.5" (F) and 8" (rear), and according to that site: http://www.tyresizecalculator.com/ty...dth-calculator, the current 245 at the rear is the max tire width...
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06-09-2015, 11:42 AM | #3 | |
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I believe those wheels are maxed out with tire-width with the 225f & 245r tires. You'll need wider wheels to accommodate wider tires. |
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06-09-2015, 11:55 AM | #5 | |
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Opinions?
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06-09-2015, 12:48 PM | #6 |
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Not sure how entirely accurate that site is. For example, I punched in the rear wheel size for a Jaguar XFR (9.5x20) and it said 275 was the max width. That car came with 285/30R20 from the factory.
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06-09-2015, 02:19 PM | #7 |
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I may be using my stock wheels for winter duty and looking at a wider aftermarket setup. 255 front, 275 rear would be awesome but I haven't had a chance to find out if that's doable yet. For my needs and stock power level I'll be looking at 235 front 255 rear.
Anyone with xDrive (or AWD know how) have an idea how to manage the diameters on a staggered setup? The stock staggered diameters front to rear are already 1.3% different which I thought was too much. Apparently xDrive may not be that picky? |
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06-09-2015, 02:36 PM | #8 | |
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First, as above, the stated range is 1%. Note that there aren't any decimal places in that number. In a situation where there's only 1 significant digit, 1% and 1.3% are the same thing. Second, dissimilarities between the front and rear axles are less critical on an xDrive car than dissimilarities side-to-side. The clutch system in an xDrive transfer case can load all the torque to the front or the back based on sensor input. This means that transfer case "wind-up" is not a given, unlike a strictly mechanical transfer case which puts some torque to both axles. As a result, BMWs have much wider tolerance of fore/aft tire size differences than other AWD cars on the market. My old VW and my wife's Subaru, with mechanical transfer cases, are both down in the 0.2% range.
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06-09-2015, 02:41 PM | #9 | |
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Here's a pic of Michelin PA4 245/40/18 on 18x8 that I took of my M3 winter setup: Here is a pic of Nitto NT05 245/40/18 on 18x8.5 on my old WRX: Here are the same Nittos next to Dunlop Z1 Star Specs. The Nittos are 245, and the Dunlops are 235: |
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06-09-2015, 02:47 PM | #10 | |||
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Put 275 on a 9.5" or 10" wheel Quote:
When you go past those is when your tire buldges out like a truck... AKA doesn't look good. |
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06-09-2015, 02:48 PM | #11 |
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Go search in the wheels section. Alot of good information already in there. Specifically with upsizing the front tires and the issues you will run it. Along with finding the correct offsets for wheels in the rear. The information is here, google is your friend.
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06-09-2015, 02:49 PM | #12 |
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Thanks for the input. That's pretty much what I assumed. I suppose though that I won't mess with 235/255 as that's 1.6% difference. I'll just have to leave it be or go with a square setup 255 all around. Not sure if 255 will fit up front, but there is potential for better front end grip and more oversteer that way.
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06-11-2015, 02:10 AM | #14 |
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I am running 255/35-18 on the rears. No problems. 255 is a much more standard size = cheaper.
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06-11-2015, 05:07 PM | #15 |
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Are there any downsides to running a 225 front, 255 rear setup? How about with xDrive? The diameters are the same but makes me wonder about understeer or changes to how xDrive handles torque split.
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06-11-2015, 06:55 PM | #16 |
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10-28-2016, 04:19 AM | #18 |
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Any photos ?
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10-28-2016, 05:33 AM | #19 |
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Correction they are 255/35/18 heres a pic i had on my phone, ill update a better one when i get home
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10-28-2016, 04:56 PM | #21 | |
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It's doable but I don't recommend it. I tried it. In fact, will use it again for driving places where I'm concerned about my front tires getting ruined (like mountains and potholes in winter). xDrive handles it all right but a) it feels like it takes more effort to get going, b) already not-so-stellar m235 handling gets worse because the fronts feels too tall and more wobbly, less precise. The positive is braking is noticeably better with wider front tires. Overall, I prefer the 225 front width. >> 225 front 255 rear. Do it. Just don't get the rear camber too negative. Common sense will tell you that it's going to increase understeer but what you're going to feel is a) noticeably better traction and b) more RWD behavior in turns, etc as more torque goes to the rear wheels. This will be especially noticeable in the wet, snow, aggressive driving, etc., and/or stability turned off. You'll love it. xDrive loves it, too. >> 255/35/18 on the stock 8 inch wheel Fits all right and handles all right. You wouldn't really notice it's "wide" unless told so. Winters are narrow so it's even less of a concern. |
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10-30-2016, 01:12 AM | #22 | |
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