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Upsizing tyre profile
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06-22-2017, 04:47 AM | #1 |
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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? |
06-28-2017, 11:28 AM | #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, 12:20 PM | #7 |
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06-28-2017, 07:22 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, 09:07 PM | #9 | |
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02-20-2019, 11:26 AM | #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, 04:44 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. |
10-17-2019, 01:36 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 09:20 PM.. |
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10-21-2019, 09:13 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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