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      10-30-2011, 07:03 PM   #1
Chas
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Looking to make spare

Would like to make a spare for my 2012 35i, has anyone made a spare up using other manufactures donut spare.
Thanks
Chas
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      10-30-2011, 08:24 PM   #2
walendvay
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Quote:
Originally Posted by Chas View Post
Would like to make a spare for my 2012 35i, has anyone made a spare up using other manufactures donut spare.
Thanks
Chas
Yes, yes I have! Spare from an '04 E83 (X3)
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      10-30-2011, 09:41 PM   #3
Lotus7
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walendvay,

Have you actually mounted the E83 spare on your F25 and then driven the car any distance?

It should fit since the E83 brakes are only a tiny bit smaller than the F25 brakes and both cars can be fitted with 17 inch wheels (which is the size of the E83 spare).

I'd be more concerned about the 1.5% difference in diameter, which might be enough to trigger an ABS and Stability Control error. Those usually have a threshold of around 2% for sustained wheel speed differences, so it might just "squeak" by in an emergency.
That error code won't stop the car from moving, but will disable the ABS and Stability controls (which may not be a problem if you drive carefully).

The F25 vehicles use a 27.7 inch O.D. tire, while E83 vehicles use a 27.3 inch tire O.D.

For anyone who is interested, the BMW P/N for the E83 4BX17 spare steel wheel is:
361 167 587 78

The matching tire (size 135/90R17 - 27.3 inch O.D.) is:
361 204 145 75

Unfortunately, going to the next size temporary spare tire (145/90R17) is just as bad, since it's larger in diameter than the F25 tires and will also create a differential wheel-speed error.
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      10-30-2011, 10:28 PM   #4
walendvay
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Quote:
Originally Posted by Lotus7 View Post
walendvay,

Have you actually mounted the E83 spare on your F25 and then driven the car any distance?

It should fit since the E83 brakes are only a tiny bit smaller than the F25 brakes and both cars can be fitted with 17 inch wheels (which is the size of the E83 spare).

I'd be more concerned about the 1.5% difference in diameter, which might be enough to trigger an ABS and Stability Control error. Those usually have a threshold of around 2% for sustained wheel speed differences, so it might just "squeak" by in an emergency.
That error code won't stop the car from moving, but will disable the ABS and Stability controls (which may not be a problem if you drive carefully).

The F25 vehicles use a 27.7 inch O.D. tire, while E83 vehicles use a 27.3 inch tire O.D.

For anyone who is interested, the BMW P/N for the E83 4BX17 spare steel wheel is:
361 167 587 78

The matching tire (size 135/90R17 - 27.3 inch O.D.) is:
361 204 145 75

Unfortunately, going to the next size temporary spare tire (145/90R17) is just as bad, since it's larger in diameter than the F25 tires and will also create a differential wheel-speed error.

Thanks for your conjecture. The wheel and tire was free. I am banking on the odds I'll never need to use it.
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      10-31-2011, 07:44 AM   #5
guycashmore
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A genuine BMW emergency spare wheel is now available, part number is 36112187043

Got mine a couple of weeks ago, it's a cute little grey painted alloy..
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      10-31-2011, 08:44 AM   #6
Lotus7
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The 36112187043 spare has been mentioned before on this thread:

Spare Tire Comments

It is the correct size for the F25 at 27.7 inches in diameter, having a 135/80R18 tire instead of the 135/90R17 (27.3 inch) tire used on the E83. Haven't seen a MSRP in the US, or any US availability, but have seen it listed in Europe at 220 Euros.
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