The only way we will know for sure is by experimental data. I would love to buy either the BMWi3 or XL1 tires. I suspect i'll only be able to get my hands on the I3 tire when it comes out in the US. But that is IF i can find a wheel with the right bolt pattern that isn't exspensive.
Now the XL1 tires are a perfect replacement as they actually have the same outside tire diameter as the ones that go on my stock 14inch wheels. No gearing benefit, but they are super skinny, and the XL1 is in the same weight category as the Insight! These would be the first modern LRR tires with such a skinny width. Sadly i suspect the XL1 tires will be unobtanium even when it is shipped to customers in Europe.
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I try to be helpful. I'm not an expert.
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