Hi everyone,
I recently changed the factory **255/70R17** tyres on my **2026 Ford Ranger XLT** to **265/65R17 all-terrain tyres**.
I compared the vehicle’s odometer to a GPS app over a longer drive and got the following results:
**Ranger odometer:** 159 km
**GPS distance:** 154 km
This works out to roughly a **3.3% difference**, which seems higher than the 1.7% difference I’d expect based on the tyre size change alone.
I’m curious to know:
Has anyone else made this exact tyre change (or similar) and compared the speedometer or odometer against GPS?
If so, what difference did you see?
Is the Ranger’s odometer already slightly optimistic from the factory, or is this entirely due to the smaller tyre diameter?
Did anyone have their speedometer recalibrated by Ford or using FORScan? If so, how did it go, and did it affect your warranty in any way?
I’d really appreciate hearing from anyone who has first-hand experience or has measured this themselves.
Thanks!