- First Name
- Brian
- Joined
- Sep 14, 2023
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- 62
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- 8,406
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- 14,849
- Location
- Central CA
- Vehicle(s)
- '23 BB 4dr 7MT, '22 BSport OBX, '87 B-II XL
- Your Bronco Model
- Big Bend
It’s easy to update the software with Forscan or ProCal though - although the software has a hard coded limit of 37”Changing to larger tires will affect a whole host of systems on a vehicle, and not just gear ratio or speedometer reading. The PCM is programed from the factory for the tires the vehicle was built with. Changing to larger tires will change the wheel speed input reading the PCM recieves from the sensors, and therefore affect output decisions to the engine, transmission and braking systems. If you want larger tires you are always better off starting with the SAS package.
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