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Old 06-04-2018, 01:17 PM   #6 (permalink)
Ecky
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Join Date: Dec 2011
Location: New Zealand
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ND Miata - '15 Mazda MX-5 Special Package
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Quote:
Originally Posted by NeilBlanchard View Post
Are you looking for economy, or something else? Are the engine RPM's at highway speeds higher than you think they should be?
Economy, primarily. Wet grip is also important. She'll be putting a lot of low-speed rural driving miles on them.

RPM are on the high side by my estimation, but my experience with larger diameter tires on my Insight has been very negative for both fuel economy and handling. The added rotating mass doesn't make up for the difference in gearing. Plus, it would throw off the speedo and odo.

Does anyone know if the different trims correct for the different tire sizes, or is it small enough they just don't bother? If I were to correct for different tire sizes, what would need to be done?
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