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Just remember that a larger diameter tire makes the speedometer show a lower speed than true and aerodynamic drag works on true speed. So at 50 mph true, the speedometer would show 50 * -4% = -2 mph or 50 - 2 = 48 mph. The driver would be tempted to run at an indicated 50 mph and be doing a true, 52 mph.
The only way larger diameter tires work is to use a GPS speedometer instead of the vehicle speedometer. Use sticky-tape over the speedometer to make sure the GPS reference is used.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
Last edited by bwilson4web; 06-12-2011 at 02:07 PM..
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