1 Size Tires On Different Size Rims - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 03-11-2005, 11:30 AM
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Went to the tire dealer the other day and they told me that I can put 225/45/17 snow tires on all 4 rims.

The thing is that my rears are 245/40/17 and the fronts are 225/45/17.

Is that true that I can put the same size tires on different size rims?

Thanks for your help.
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#2 (permalink) Old 03-11-2005, 01:06 PM
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No. The 225 and 245 represent the width of the rim so there is no way that the width of the 225 would cover the 245. He doesn't know what he is talking about. You have to get the same tire width to fit the rim width.

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#3 (permalink) Old 03-11-2005, 01:56 PM
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http://www.powerdog.com/tiresize.cgi

Tire size results
Specification Sidewall Radius Diameter Circumference Revolutions Speedometer Odometer Difference
225/45-17 4.0" 12.5" 25.0" 78.5" 808/mi 60MPH 10000mi N/A
245/40-17 3.9" 12.4" 24.7" 77.6" 816/mi 61MPH 10104mi -1.0%


Almost the same size tire.
2 cm wider...Not a biggie.
You want a narrow tire for the winter anyway.
Also do you know what the factory tire sizes are for your year/model BMW.
Could be that the previous owner went for a slightly wider tire in the back in the aftermarket.
Good luck!
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#4 (permalink) Old 03-11-2005, 02:03 PM
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Thanks for the input. Yeah, that's what I thought.

The guy was a little shady anyway. Probably just wanted to get a quick sale.
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#5 (permalink) Old 03-11-2005, 02:59 PM
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Sounds like you have the optional staggered fitment on your car. While the width of the tire is different, the width of the rim is the same. Yes, the 225/45/17 snow tires will fit on your car. I am running 225/45/17 right now on all corners and am ordering the optional fitment size for the rears this weekend. If you can fit them why not drop down to a 16" rim and have a takeoff set for the winter? The 16" snows are usually cheaper and with a larger sidewall (maintaining the stock overall diameter of the tire) the harsh impacts of potholes in winter will be better tolerated.
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#6 (permalink) Old 03-11-2005, 09:19 PM
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I am running 225/45/17 (Dunlop Sp 901) on the front of my car and 245/40/17 (Michelin Pilot Sport) at the back.

If the rims are stock, chances are they are the same size.
The broader size tires/wheels at the back increase the handling capabilities of the car.

The dealer is right they will work and they are snow tires so the difference in handling should be neglible.
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