* AWD System Damage: The system relies on the wheels rotating at roughly the same speed. Different sized tires will cause a significant speed difference between the front wheels. This can lead to binding in the differential, transfer case, or even damage to the axles. The system may try to compensate, causing stress and potential failure of components. It's not a matter of *if* but *when* something will break.
* ABS Problems: The Anti-lock Braking System (ABS) relies on wheel speed sensors to function correctly. The discrepancy in wheel speed from the different sized tires will confuse the ABS, potentially rendering it ineffective or causing it to malfunction. This is a serious safety concern.
* Traction Control Issues: Similar to the ABS, traction control relies on consistent wheel speed readings. The differing tire sizes will disrupt this system, leading to unpredictable handling and reduced traction.
* Steering Problems: The difference in tire diameter will affect the steering geometry, potentially leading to uneven wear on the tires and components within the steering system. The vehicle may pull to one side.
* Speedometer Inaccuracy: Your speedometer will be inaccurate because it's calibrated to the tire size. The smaller tire will cause the speedometer to overread speed, while the larger tire will cause an under-reading.
In short, don't do it. It's a recipe for expensive repairs and potential safety hazards. Maintaining consistent tire size on all four wheels is crucial for the proper functioning of a 4WD or AWD vehicle.
