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You can buy compact spare wheels that'll fit the tires on the XL1 and BMW i3. It's not too much trouble, i could cover the cost by selling my stock alloys. For me i'd need to get a pair of 4x100 to 5 x 114.3 wheel adapters. Any spare 16 inches and up will have a 5 bolt pattern.
The 115 80 r15 on the front wheels of the XL1 can be got from a Mini cooper in my 4x100 stock bolt pattern. Which would be great, but 115 is for the non driven front wheels, not the 145 rear drive wheels. Could be sketchy, but i wonder how much mpg i could get.
A few of the stock spare tires have a highway speed rating. But all spare tires have an F or worse rating in rolling resistance!
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I try to be helpful. I'm not an expert.
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