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The Potenza RE92 165/65R14 are rated for use on 14" rims, 4.0" to 6.0" wide. Stock rims on the Insight are 14"x5.5", and the spare tire has an alloy wheel, 14"x4.0". What would happen if I got four spare wheels and mounted real tires on them?
I reckon the answer would be "larger circumferance, smaller contact patch, less traction". But would the differences be noticeable, and would there be less sidewall flexion and rolling resistance?
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