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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Upsizing tyre profile



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      06-22-2017, 05:47 AM   #1
E60525d
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Upsizing tyre profile

I have a LCI E90 with MV3 alloys. Tyre size are 225/40/18 and 255/35/18.

I am thinking to increase the tyre profile for increase comfort and I believe they will fill the arch better. So will be going for 225/45/18 and 255/40/18.

I have done a search and it seems a few people have done this.

http://www.e90post.com/forums/showthread.php?t=132580
http://www.bimmerfest.com/forums/sho...d.php?t=607854
http://www.e90post.com/forums/showthread.php?t=142543
https://www.auto-treff.com/bmw/vb/sh...89#post2263489

What do you think?
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      06-25-2017, 11:47 AM   #2
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Any thoughts on this?
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      06-26-2017, 09:55 AM   #3
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No need for a co-signer...you've done your homework and found it should be an easy fit.

Go for it.
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Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10/20 F/R spacers
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      06-26-2017, 03:30 PM   #4
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Only thing I don't know, will the ride comfort be noticeably better? Will the difference be obvious?
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      06-27-2017, 09:42 AM   #5
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Depends on the tire you end up choosing. In most cases though, yes, "ride comfort" does increase.
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'07 E90 335i - Automagic - Non-sport
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Bilstein B6|Dinan Camber Plates|E93 M3 FSB-LCA-Guide Rods|Manzo Toe Arms|HPS 5.0
Sonic Tuning ST100 - 18x8.5 ET35 - Conti DWS 245/40/18 - 10/20 F/R spacers
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      06-28-2017, 12:28 PM   #6
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I ran upsized tires on my wagon and I can echo the comfort side of it. These 225/45R18 & 255/40R18 ride just as comfortably as my 225/45R17. They look a bit big but otherwise seem to function fine.


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      06-28-2017, 01:20 PM   #7
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Quote:
Originally Posted by eurojulien View Post
I ran upsized tires on my wagon and I can echo the comfort side of it. These 225/45R18 & 255/40R18 ride just as comfortably as my 225/45R17. They look a bit big but otherwise seem to function fine.


Thanks, do you have any more pics? Any issues with rubbing?
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      06-28-2017, 08:22 PM   #8
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Ride comfort will definitely improve, but one thing to consider is that increasing your overall rolling diameter will throw off your speedometer a bit. Increasing the rolling diameter will cause your speedometer to read low, so you will be travelling faster than it reads.
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      06-28-2017, 10:07 PM   #9
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Quote:
Originally Posted by VMRWheels View Post
Ride comfort will definitely improve, but one thing to consider is that increasing your overall rolling diameter will throw off your speedometer a bit. Increasing the rolling diameter will cause your speedometer to read low, so you will be travelling faster than it reads.
Not really. Factory speedo reads ~3% higher than actual vehicle speed. Any modern phone/GPS unit can tell you that. Therefore, increasing diameter size just a bit can actually make the speedo more accurate.
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      02-20-2019, 12:26 PM   #10
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Apologies to bump this thread.

Has anyone got any more feedback on upsizing tyre profile?

I've seen a few E90 but there SE models. Concerned that I might get issue on my M Sport
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      10-16-2019, 05:44 AM   #11
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Just to update this thread to aid others.

I did end up changint tyres to 225/45/18 front and 245/40/18 rear and its fine, no issues.

I'll will take some pics but the car sits very nicely.
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      10-17-2019, 02:36 PM   #12
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Pics please. My car speedo reads 6.6% higher than actual when matched to phone GPS, doing 80 gives me 75. (205/55/16 winters instead of OE 225/45/17).

I have 18s and I want to run 225/45/18 all around (4% increase from OE) to cover up that speed gap. I paid for BimmerCode then found out they can't remove that (Corrected) from US car speedo.

Think 235/45/18 will fit up front? I'm running OE suspension. I plan to put on adjustable later to raise the suspension a tiny bit.

Last edited by Soravia; 10-17-2019 at 10:20 PM..
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      10-21-2019, 10:13 AM   #13
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I run 235/40 on 8x18 et40/sport oem suspension and the clearance against plastic covers is not much... comfort/grip is better, speedo reads still a bit higher than gps...
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