Do bigger tires affect odometer? If bigger tires affect ones speedometer wouldn't it also affect the number of miles driven displayed on the odometer? Just upgraded some parts on my 2002 I6 4.0 manual and this crossed my mind.
1/8” tread wear on a 36-inch tire reduces the circumference by 0.8 inches. Over the length of 1 mile, this adds up to 33.6 feet. After “actually” traveling 157 miles, the odometer will be “off” by 1 mile. It will read 158 miles. Smaller diameter tires will effect odometer reading more than larger tires.
Bigger tires will cause your speedometer to register a speed that is slower than your actual speed. For example, if your speedometer says 35 miles per hour on 20-inch diameter tires, changing to 23-inch diameter tires will make your true speed 40.25 mph, even though your speedometer will still show 35 mph.
Yes they do. The odometer and speedometer count the revolutions of the axle. With bigger tires you go further for each revolution of the tires.
Changing tire size is one of the most common things car owners do that can affect speedometer accuracy. That’s because larger tires cover more ground in one complete revolution. Consider the example below.
It depends on how much bigger the wheels/tires than the standard ones for that vehicle. As Mangetout said, adding only 1 inch to the diameter adds roughly 4% to the circumference on a 25" tire. Adding 2.5" would add 10%. This 10% will translate directly to the speedometer, hence the speedometer would read 54 mph while actually traveling 60, and the odometer in that for every 60 miles tra...
The speedometer in almost every vehicle runs off the speed of the transmission, not the actual tires. However, some old Volkswagens and other makes and models do have a speedometer cable that runs directly to the front wheels, but this is extremely uncommon.
Putting larger diameter tires on any vehicle will affect the speedometer and odometer readings. If you know the revolutions per mile for the original tires and the larger tires, you could ...
…look, changing your vehicle's tire size affects more than just cosmetics. Altering your vehicle's tire size can affect speedometer and odometer accuracy, handling, steering response and even safety issues such as tire load capacity. If done incorrectly, changing the tire size can decrease…
The odometer and speedometer will be affected as much as 15% when tires are over sized. Yes the speedo gear reads off the transmission output shaft but the speedo gear is syncronized with a specific tire size.