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      04-26-2013, 06:20 AM   #45
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After several hours of reading, I still haven't figured out, what would work best. I plan on using a square set up and would like it to look flush. Do I go with 245/40/18 front,rear or 235/45/18 front and rear or 235/40/18 ?? Which would give me the better look and would be considered BMW approved. The tires will not go on the stock wheels...I intend on buying new ones. Help!!!
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      04-26-2013, 09:05 AM   #46
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Quote:
Originally Posted by oztiks View Post
After several hours of reading, I still haven't figured out, what would work best. I plan on using a square set up and would like it to look flush. Do I go with 245/40/18 front,rear or 235/45/18 front and rear or 235/40/18 ?? Which would give me the better look and would be considered BMW approved. The tires will not go on the stock wheels...I intend on buying new ones. Help!!!
So this is what I ended up doing

http://www.f30post.com/forums/showthread.php?t=831520

Pics of the fit before and after from a bunch of angles

Bridgestone 245/40R18 on all four corners on stock 397 18x8" rims

They fit no problem and absolutely transform the car's handling
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      05-26-2013, 09:25 PM   #47
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I ended up going with the 235/45/18 18x8 square set up with 5mm spacers on back....looks fantastic and flush even without the spacers on back ....it looked awesome. 235/45/18 looked better to me than the 245/40/18. I tried both.

Last edited by oztiks; 05-26-2013 at 10:03 PM..
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      06-06-2013, 02:34 PM   #48
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I have an M sport and I'm planning on running a 19x8.5 inch rim square setup. Should I run 245/35 or 255/35 or 245/255 stagger? I feel like 255 is too big for the 8.5 inch rim, but I don't want to sacrifice any grip going down to 245 in the back. But I assume it won't make a big difference.
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      06-07-2013, 04:42 AM   #49
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Quote:
Originally Posted by momo3605 View Post
I have an M sport and I'm planning on running a 19x8.5 inch rim square setup. Should I run 245/35 or 255/35 or 245/255 stagger? I feel like 255 is too big for the 8.5 inch rim, but I don't want to sacrifice any grip going down to 245 in the back. But I assume it won't make a big difference.
That's what I got:

19x8.5 all around
245/35 (F), 255/35 (R)

Looks fine, handles well, no complaint.

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      06-07-2013, 04:50 PM   #50
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Quote:
Originally Posted by ks200906 View Post
That's what I got:

19x8.5 all around
245/35 (F), 255/35 (R)

Looks fine, handles well, no complaint.

Thanks! I'll do this too
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      03-17-2016, 10:18 PM   #51
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Quote:
Originally Posted by oztiks View Post
I ended up going with the 235/45/18 18x8 square set up with 5mm spacers on back....looks fantastic and flush even without the spacers on back ....it looked awesome. 235/45/18 looked better to me than the 245/40/18. I tried both.
Pics please
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      03-18-2016, 01:56 PM   #52
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I just ordered wheels and I really hope I didn't mess up! Due to availability I bought 18x8.5 +40 wheels for all four corners. Would 245/40/18 work properly? I don't really want anything sticking out too far. From a conversion chart I found on a E90 forum, they should stick out 10mm further than my stock 17" wheels.
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      03-18-2016, 07:02 PM   #53
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Quote:
Originally Posted by WV328 View Post
I just ordered wheels and I really hope I didn't mess up! Due to availability I bought 18x8.5 +40 wheels for all four corners. Would 245/40/18 work properly? I don't really want anything sticking out too far. From a conversion chart I found on a E90 forum, they should stick out 10mm further than my stock 17" wheels.
that should work fine...
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      03-18-2016, 07:06 PM   #54
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Ok good, thank you!
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      04-11-2016, 07:37 AM   #55
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Anyone running a square 245/40-19 setup?
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      04-11-2016, 07:43 AM   #56
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Quote:
Originally Posted by RedKloud View Post
Anyone running a square 245/40-19 setup?
I think that tire is going to be too tall. That's roughly 26.9" tall.

A 245/45/18 is about 26.6" tall and that's very close to the limit (if not already past) on the front.
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      04-11-2016, 08:24 AM   #57
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No issues with 245/40-19!

Vitoco has a square 245/35-20 (equal diameter) setup on F31 with ET35: f30.bimmerpost.com
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      06-22-2017, 01:49 PM   #58
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Quote:
Originally Posted by Bvlldawg View Post
No intention to thread jack but I have a question about this set up... is it possible to run a square set up of 18x9 et44 wheels with 255/40R18 tires? Or would I need a spacer to clear the front? Any help is much appreciated! '17 340i xdrive
I think you'll definitely have problems with that wheel width and offset up front.
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      06-24-2017, 08:48 PM   #59
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I'm running a 255 square setup 19x8.5 (ET34).

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      06-25-2017, 12:19 AM   #60
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Quote:
Originally Posted by dizzyF30 View Post
I'm running a 255 square setup 19x8.5 (ET34).

Same here. Michelin Pilot 4S 255/35/19x9.5 square. I did more research than anyone should ever have to and was a guinea pig for the 255 in front. No rubbing at all and 255/35 will give you within 1% of OEM specs. (xDrive)

Please excuse the wheel gap as I haven't lowered yet. It's still better with 19s than the stock 18s though. I should get a window sticker that reads "Mind the Gap". (UK)

http://f30.bimmerpost.com/forums/sho...0#post21816070
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      06-25-2017, 06:37 AM   #61
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Quote:
Originally Posted by Bvlldawg View Post
No intention to thread jack but I have a question about this set up... is it possible to run a square set up of 18x9 et44 wheels with 255/40R18 tires? Or would I need a spacer to clear the front? Any help is much appreciated! '17 340i xdrive


You would need a at least a 12mm spacer up front to clear the strut.
My set up now is SSR TYPE C 18x8.5 et32 w/ 255/40/18. No rubbing even w/ full load or hard cornering.
I also had a square set of BMW 513m before 18x9 et29 w/ 255/4018. No rubbing, but the front wheels were out a little, and needed more camber.
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      06-25-2017, 12:13 PM   #62
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Quote:
Originally Posted by dizzyF30 View Post
I'm running a 255 square setup 19x8.5 (ET34).

This looks like a perfect fit and great look I'm assuming this is stock fit with just the ET34 offset (ie no spacers)?
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      06-25-2017, 01:46 PM   #63
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Quote:
Originally Posted by rphz View Post
This looks like a perfect fit and great look I'm assuming this is stock fit with just the ET34 offset (ie no spacers)?
No spacers, and I'm "mildly" dropped on Bilstein B14 coilovers.
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      06-26-2017, 08:04 PM   #64
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Thanks dizzyF30

Wondering if someone can help me understand the mismatching of stock tire sizes on wider non-stock rims? A typical stock staggered 19" has 225/40/19 on 8" in front and 255/35/19 on 8.5" rears. I'm familiar with the importance of diameter matching (especially w/ AWD), offsets, and effects on speed when going non-stock sizing. Forgetting about all of that for a minute and focusing strictly on tire width and traction advantage on a 19" diameter wheel, why do some recommend a 225, 235 or 245 tire on a 8.5" or even 9" wheel? It seems like a 255 is nearly square on a 8.5" wheel and a factory recommended combination, but a 225 on 8.5" seems very undersized. When comparing a 8.5" on a 225/40/19 vs 255/35/19, wouldn't you want that extra ~1" of tire width for traction?

What are the advantages of going with a wider wheel when the tire size is the same width (again assuming that diameters and speedo are in spec)? Is this strictly for the appearance and/or poke?
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      06-26-2017, 09:19 PM   #65
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Quote:
Originally Posted by rphz View Post
Thanks dizzyF30

Wondering if someone can help me understand the mismatching of stock tire sizes on wider non-stock rims? A typical stock staggered 19" has 225/40/19 on 8" in front and 255/35/19 on 8.5" rears. I'm familiar with the importance of diameter matching (especially w/ AWD), offsets, and effects on speed when going non-stock sizing. Forgetting about all of that for a minute and focusing strictly on tire width and traction advantage on a 19" diameter wheel, why do some recommend a 225, 235 or 245 tire on a 8.5" or even 9" wheel? It seems like a 255 is nearly square on a 8.5" wheel and a factory recommended combination, but a 225 on 8.5" seems very undersized. When comparing a 8.5" on a 225/40/19 vs 255/35/19, wouldn't you want that extra ~1" of tire width for traction?

What are the advantages of going with a wider wheel when the tire size is the same width (again assuming that diameters and speedo are in spec)? Is this strictly for the appearance and/or poke?
Wider rims with the same tire size sharpen the responses. The sidewalls of the tire flex less during direction changes as more of the forces are absorbed by the stiffer wheel and less by the comparatively softer tire sidewall.

The section size in contact with the road increases slightly with wider wheels for the same tire size also.

https://www.tirerack.com/tires/tiret...jsp?techid=200

I just made this change myself, keeping the original MPSS tires on 8.0-->8.5" 225/45/18 front and 8.5-->9.5" 255/40/18 rear. The car feels much sharper with more grip both front and rear. It is easily noticed and a change for the better.
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      07-10-2017, 07:35 PM   #66
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Thanks for your response Red_Baron (and sorry for the late reply). It's interesting that you noticed an improvement just increasing wheel widths, but that does make sense. I'm still struggling with a 225 vs 255 on a 8.5" rim purely for better front traction and less understeer. While a stretched 225/40 gets you ~0.2" more width (and some sidewall stiffening) on a 8.5, I would still guess that a 255/35 on 8.5" rim with an additional ~1" width would perform better (and has slightly shorter sidewall).

I'm I wrong to assume that a square 255/35/19 on 8.5" rims will provide better overall traction and handling (and less understeer) than a square 225/40/19 on 8.5" rims?
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