I have a 2001 Honda Accord (silver) which I bought “pre-owned” from a Honda Store in Tucson in 2006. I just recently found out that the car has 14-inch wheels while having been designed for 15-inchers. This helps explain why I frequently scrape the street coming out of our driveway and bump up over curbs when parking front-in.
All that, however, was less concerning than realizing, on a 7-hour drive from Ohio to Michigan last week, that my speedometer’s display is approximately 5-6 miles in excess of my actual speed. So, even though the (analog) display showed, say 75 mph, my GPS showed 69 mph, which I later verified on an iPhone app. I guess this makes sense, given that a smaller wheel has more revolutions than a larger wheel.
My question to the Car Talk community is whether this is also excessively driving up the odometer’s counter? And are there any other side effects I’m not considering. This could conceivably mean I’m going in too frequently for service and losing resale value.
What would the formula be to determine the mileage difference between a 14-inch and a 15-inch wheel, and could that help determine the cost/benefit of replacing the wheels with the correct size? Thank you!