Help: OK to run same tire sizes with mismatched tire brands or models? - BMW 3-Series (E90 E92) Forum

kamek · 12-17-2012, 04:26 PM

I know our XI systems are sensitive to rolling diameter differences, etc. so I was wondering if running the same tire sizes but in different brands or models would be OK. For example, running three Continental 225/45/17s and one Bridgestone 225/45/17.

I ask because I currently have four 225/45/17 Continental DWS non-RFT tires on my car and would like to throw an old wheel with a 225/45/17 Continental ContiProContact RFT in my trunk for long trips as a spare. In the event of a flat, I could throw on the spare RFT so I could get to a tire shop, but I'd have mismatched tires on the car.

Does anyone know if this would be OK to do?

icyhot e92 · 12-18-2012, 12:04 AM

Diameter wise they are all 25". The difference will be in the tread depth but it is so small of a difference. If for emergency only and all the other tire pressures are ok then it shouldn't be a problem. Handling is a different story since the stiffness is different.

kamek · 12-18-2012, 01:10 AM

Quote:

Originally Posted by icyhot e92

Diameter wise they are all 25". The difference will be in the tread depth but it is so small of a difference. If for emergency only and all the other tire pressures are ok then it shouldn't be a problem. Handling is a different story since the stiffness is different.

Thank you! It would only be for emergency use until I could make my way to a tire shop for repair or replacement.

12-17-2012, 04:26 PM	#1
kamek Brigadier General Drives: 328xi 6MT Join Date: Mar 2008 Location: Queens, NY Posts: 3,152 iTrader: (4) Garage List 2008 BMW 328xi [4.10]	Help: OK to run same tire sizes with mismatched tire brands or models? I know our XI systems are sensitive to rolling diameter differences, etc. so I was wondering if running the same tire sizes but in different brands or models would be OK. For example, running three Continental 225/45/17s and one Bridgestone 225/45/17. I ask because I currently have four 225/45/17 Continental DWS non-RFT tires on my car and would like to throw an old wheel with a 225/45/17 Continental ContiProContact RFT in my trunk for long trips as a spare. In the event of a flat, I could throw on the spare RFT so I could get to a tire shop, but I'd have mismatched tires on the car. Does anyone know if this would be OK to do? __________________ E92 328xi \| KW \| AA \| LUX \| OEM 359M \| BMW Performance Exhaust
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12-18-2012, 12:04 AM	#2
icyhot e92 Captain Drives: 335xi coupe Join Date: Sep 2009 Location: new york Posts: 697 iTrader: (2)	Diameter wise they are all 25". The difference will be in the tread depth but it is so small of a difference. If for emergency only and all the other tire pressures are ok then it shouldn't be a problem. Handling is a different story since the stiffness is different.