Any Warning Light issues going 45 sidewalls on e90 (18" wheels)??

N52UNED · 03-18-2019, 10:40 AM

I just picked up a set of 397 wheels with tires (Pirelli RFT's) .

These are 225/45 r18 ... I'm aware that I should have 225/40's , but the tires have lots of tread left. I plan to ditch them early since they are the wrong size, and typically I'm not the biggest fan of Pirelli passenger car tires in general. But I'd rather use them them to a reasonable amount of tread depth vs trying to sell them.

I understand they'll throw off my speedo by about 2mph +/- depending on speed. And that at 80mph I'lll be doing about 85mph +/- ... I have done a few searches on this, but no real feedback regarding throwing codes. Just pretty much people stating it could ... not necessarily if it will throw codes.

With all that ... has anyone had issues with their car throwing codes when running a thicker wall than spec'd?

Thanks!

weehe126 · 03-18-2019, 04:37 PM

If you are running them on all 4 corners it won't throw a code. Your speedo will probably be accurate with them vs reading 5mph slow like stock. My only concern would be rubbing in the front on full lock.

N52UNED · 03-18-2019, 07:30 PM

No codes, that size tire should fit fine (assuming you aren't slammed, etc.).

N52UNED · 03-18-2019, 08:35 PM

Quote:

Originally Posted by FCobra94

No codes, that size tire should fit fine (assuming you aren't slammed, etc.).

Cool. I hadn't read of any fitment issues with this OEM tire and wheel combo (from an F30) on an e90

It's a non-sport suspension. I purposely got a non-sport since I knew I would be upping the wheel size and running less rubber later down the road; and didn't want a stiff suspension to begin with.

On the plus side, the 45 will fill up the wheel well a bit more. I'm not planning on lowering anytime in the future.

I'm sure I'll be putting some spacers on the back and front. Maybe 20mm or 15mm rear / 12mm front ... IDK.

nsjames · 03-18-2019, 08:58 PM

I have 240/45 18s.
cause free e60 wheels and tires.

uncorrected speed is 1 MPH slow.
speedomet speed is still 2mph fast.
it's fine.

N52UNED · 03-19-2019, 11:34 AM

Quote:

Originally Posted by nsjames

I have 240/45 18s.
cause free e60 wheels and tires.

uncorrected speed is 1 MPH slow.
speedomet speed is still 2mph fast.
it's fine.

Thanks!

03-18-2019, 10:40 AM	#1
N52UNED Captain 179 Rep 601 Posts Drives: '07 328i/330BPC Join Date: Mar 2017 Location: Sunshine State iTrader: (1)	I just picked up a set of 397 wheels with tires (Pirelli RFT's) . These are 225/45 r18 ... I'm aware that I should have 225/40's , but the tires have lots of tread left. I plan to ditch them early since they are the wrong size, and typically I'm not the biggest fan of Pirelli passenger car tires in general. But I'd rather use them them to a reasonable amount of tread depth vs trying to sell them. I understand they'll throw off my speedo by about 2mph +/- depending on speed. And that at 80mph I'lll be doing about 85mph +/- ... I have done a few searches on this, but no real feedback regarding throwing codes. Just pretty much people stating it could ... not necessarily if it will throw codes. With all that ... has anyone had issues with their car throwing codes when running a thicker wall than spec'd? Thanks!
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03-18-2019, 04:37 PM	#2
weehe126 Brigadier General 1161 Rep 3,189 Posts Drives: 2017 340i Join Date: Apr 2014 Location: San Antonio iTrader: (2)	If you are running them on all 4 corners it won't throw a code. Your speedo will probably be accurate with them vs reading 5mph slow like stock. My only concern would be rubbing in the front on full lock.
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03-18-2019, 07:30 PM	#3
FCobra94 Guest 0 Rep n/a Posts Drives:	No codes, that size tire should fit fine (assuming you aren't slammed, etc.).
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03-18-2019, 08:58 PM	#5
nsjames Brigadier General 2440 Rep 4,330 Posts Drives: 08 328xi Touring Join Date: May 2017 Location: ohio iTrader: (0)	I have 240/45 18s. cause free e60 wheels and tires. uncorrected speed is 1 MPH slow. speedomet speed is still 2mph fast. it's fine.
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