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I'm happy to be a guinea pig but I'm not ready to buy yet. Still got more research to do. I visited a BMW dealer today and they said the space saver spare for my E90 M3 is a 3.5x17" with part number 36 11 0445 045 which is a wheel with a 125/80x17 tyre. Price is not too bad at $A604 + GST. However that's a different part number to the 36 11 6 788 203 wheel that another dealer sold to an owner.
Anyway, my mechanic is convinced a 17" wheel will not fit and I agree after taking more measurements. So that's not an option. Pity because a 125/80x17 has a circumference that is only 3.5% different to our M3 tyres whereas the X5 space saver 155/90x18 is 12% different. OK on the front but I don't think the diff would enjoy that for long.
Also, the X5 wheel is 5" wide which is not as compact as the 17" with a 3.5" width.
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