Bringing this over from the Mustang6g community since I've seen folks asking about tire/wheel sizes and speedo issues. You should be able to adjust Forscan speedo calibration using the calculator link. Also including info on how to match up the revolutions per mile if you'd prefer to not mess with recalibration.
*Disclosure: I am NOT a tire, wheel, or FORScan expert. I have not used the device to make these adjustments. Do so at your own risk.
Ford As-Built Tire Calculator
Tire Size Comparison
Discount Tire Conversion
FORScan Forum - How to Adjust Tire Size (thread)
Correct Your Speedometer Error - No Flash or Tune Required (FORScan thread from Mustang6g user Spart)
Tire Rack also has all the specs on every tire for actual tread width and revolutions per mile. Keep in mind that not every tire with a listed width is the same. You can have a "295" tire from different brands with a 1" to 2" tread width difference.
If you click on "Specs" on the tire model info page you'll have access to all this info:
This is what it looks like when you select multiple tires to compare and then click on the "Detailed Specifications" + button:
*Disclosure: I am NOT a tire, wheel, or FORScan expert. I have not used the device to make these adjustments. Do so at your own risk.
Ford As-Built Tire Calculator
Tire Size Comparison
Discount Tire Conversion
FORScan Forum - How to Adjust Tire Size (thread)
Correct Your Speedometer Error - No Flash or Tune Required (FORScan thread from Mustang6g user Spart)
Tire Rack also has all the specs on every tire for actual tread width and revolutions per mile. Keep in mind that not every tire with a listed width is the same. You can have a "295" tire from different brands with a 1" to 2" tread width difference.
If you click on "Specs" on the tire model info page you'll have access to all this info:
This is what it looks like when you select multiple tires to compare and then click on the "Detailed Specifications" + button:
