Forscan obx tire circ mm help

[rsf826]

I purchased a base Bronco and immediately swapped out the Steelies for the OBX wheels and tires from a friends build who was replacing his wheels and tires. I recalculated the tire circumference in mm using tiresize.com but when I compare my speedometer to gps I am slower by 2 mph. Can someone provide me with the tire circumference in mm that was programmed in to the Bronco? My calc had me at 2558 but I am thinking it should be closer to 2500.

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[artdog]

On a level surface, put a chalk mark on your tire and the ground at the 6:00 position. Roll the vehicle back until the chalk mark is again at 6:00. Measure the distance and convert to mm

 

[BasedBronco]

@rsf826 Did you ever get a good circumference down? I just did the same swap and I noticed 2558mm is a bit off.

 

[rsf826]

@rsf826 Did you ever get a good circumference down? I just did the same swap and I noticed 2558mm is a bit off.

I am currently running with 2425mm for my measurement. It seems to be right on with the OBX wheels and tires.

 

[BasedBronco]

Thanks! Right as you posted this I figured out a way. I grabbed a VIN from an Outer Banks dealership listing and pulled it out of the as-built data. FYI the OEM value is 2475 (0x09AB).

I went ahead and made a thread.

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