- First Name
- Fastmc25
- Joined
- Mar 25, 2025
- Threads
- 6
- Messages
- 438
- Reaction score
- 1,300
- Location
- East Tennessee
- Vehicle(s)
- 24 Big Bend
- Your Bronco Model
- Big Bend
Originally a Big Bend with 255/75-17 tires.
I am battling speedometer correction for oversize tires.
My current tires are 285/70-17. = 32.7” diameter
When I input the actual diameter of 32.7” of the tire, my speedometer ends up reading 3mph faster than gps.
For a test i Then I went up in diameter to 33.9 and now the speedometer reads 2 mph faster than the gps.
i am going to later today run two gps’s and see if it’s the same or a gps issue.
I am battling speedometer correction for oversize tires.
My current tires are 285/70-17. = 32.7” diameter
When I input the actual diameter of 32.7” of the tire, my speedometer ends up reading 3mph faster than gps.
For a test i Then I went up in diameter to 33.9 and now the speedometer reads 2 mph faster than the gps.
i am going to later today run two gps’s and see if it’s the same or a gps issue.
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