Tire size

Bakerman · 06-16-2023, 10:48 AM

I have a 2021 230 x drive vert. It has 225/40/18 pirelli run flats. I have experienced several blow outs after hitting small to medium chuckholes. Is it the fault of the tire brand or the size? Not much rubber between the wheel and the road. Would I be able to change size to 225/45/18 without a problem? I know the Pirelli’s are terrible run flats. Should I stay with the original size and just change brands or could I change size? No way to avoid chuck holes in Ohio.

Scorp81 · 07-06-2023, 10:12 PM

The diameter change will throw off your speedometer slightly. The difference between 45 and 40 is so small. Maybe switch to non-run flats? Michelin PS4 AS?

schnell325 · 07-06-2023, 11:57 PM

A better choice may be a 235/40 18” A much closer diameter to the 225/40 versus 225/45

06-16-2023, 10:48 AM	#1
Bakerman New Member 0 Rep 11 Posts Drives: BMW X1 Join Date: Jan 2022 Location: Ohio iTrader: (0)	Tire size I have a 2021 230 x drive vert. It has 225/40/18 pirelli run flats. I have experienced several blow outs after hitting small to medium chuckholes. Is it the fault of the tire brand or the size? Not much rubber between the wheel and the road. Would I be able to change size to 225/45/18 without a problem? I know the Pirelli’s are terrible run flats. Should I stay with the original size and just change brands or could I change size? No way to avoid chuck holes in Ohio.
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07-06-2023, 10:12 PM	#2
Scorp81 New Member 9 Rep 27 Posts Drives: BMW 228i GC Join Date: Feb 2022 Location: Toronto iTrader: (0)	The diameter change will throw off your speedometer slightly. The difference between 45 and 40 is so small. Maybe switch to non-run flats? Michelin PS4 AS?
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07-06-2023, 11:57 PM	#3
schnell325 Bored at work.... 891 Rep 5,393 Posts Drives: 2016 F82 M4 GTS//2022 M235iGC Join Date: Aug 2007 Location: Comox Valley iTrader: (8)	A better choice may be a 235/40 18” A much closer diameter to the 225/40 versus 225/45 __________________ Grey Matter:2008 E92 M3:608/425. SG/PS SOLD! Dark Matter:2015 F80 M3:495/505. SOLD! Anti Matter :2016 F82 M4 GTS What next?!? A 2022 M235i GC- I must be getting old
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