CX5 and CX9 powertrain

Take a look at the tire revolutions per mile for the different tire sizes under specs on TireRack on line. Subtract the difference and divide by the stock number x 100 and you will get the effect in percent to your speedometer and odometer.
Not worried about speedometer or odometer, only if it will have issues with transmission /gearbox. That's all I want to know specifically with either 245x50x19 or 255x50x19.
 
Hence more gears is better. If Mazda is not willing to spend money developing an 8-speed or 10-speed automatic transmission, they should outsource one from Toyota*s new 8-speed tranny found in Camry and RAV4 and its design philosophy is very similar to SkyActiv-Drive 6-speed AT.

The turbo motor alleviates this.
 
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