Tire Size Calculator
This tire calculator will show speedometer error as a result of changing tire sizes. This could help in deciding what size tire would cause the least error when upgrading to a larger wheel size. Choose the original tire size and the new tire size and click 'Calculate'. For more information on tire size codes, Click Here.

Enter tire information
Original Tire: / /
New Tire: / /

Tire Information  
  Original Tire New Tire
Width
Side Wall Height
Overall Diameter

Results  
  60 MPH 100 MPH 140 MPH After 10,000 Miles
Speedometer
Error
Key
60 MPH-Speedometer: What the speedometer would read when the vehicle is travelling at 60 mph.
60 MPH-Error: How off the speedometer would be at 60 mph.
100 MPH-Speedometer: What the speedometer would read when the vehicle is travelling at 100 mph.
100 MPH-Error: How off the speedometer would be at 100 mph.
140 MPH-Speedometer: What the speedometer would read when the vehicle is travelling at 140 mph.
140 MPH-Error: How off the speedometer would be at 140 mph.
10,000 Miles-Speedometer: What the odometer would read after the vehicle has travelling 10,000 miles.
10,000 Miles-Error: How off the odometer would be after 10,000 miles.

 
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