* Lift Kit: The most significant factor. A stock Bronco has very limited clearance. To fit larger tires, you'll almost certainly need a suspension lift kit (and potentially a body lift). The height of the lift kit directly determines how much larger your tires can be. A 2-inch lift will allow for considerably smaller tires than a 6-inch or even a larger lift.
* Wheel Backspacing: The distance from the wheel mounting surface to the wheel's inner edge. Incorrect backspacing can cause rubbing even with a lift kit. You'll likely need wheels with appropriate backspacing for larger tires.
* Tire Size and Type: Even with a lift, some 35-inch tires might rub, while others might fit fine depending on the tire's design (wider or narrower, more or less aggressive tread).
* Fender Trimming/Modification: Even with a lift and correct backspacing, some trimming of the fenders or body might be necessary to prevent rubbing, especially during articulation (turning or flexing the suspension).
In general:
* Stock: Stock Broncos typically came with relatively small tires.
* With Minor Lift (2-4 inches): You might be able to fit 31-33 inch tires with some minor modifications.
* With Moderate Lift (4-6 inches): 33-35 inch tires are often achievable.
* With Significant Lift (6+ inches): You could potentially fit 35-inch or even larger tires (37-inch or even 40-inch in some extreme cases), but this often requires extensive modifications beyond a lift kit.
To find the maximum tire size for YOUR Bronco:
1. Determine your lift kit height (if you have one).
2. Research online forums (like Bronco forums) dedicated to your model year. People there will have detailed information on tire and wheel combinations that work with various lift kits.
3. Consider professional advice: A 4x4 shop specializing in Bronco modifications can assess your specific vehicle and recommend appropriate tires and wheels.
Don't just assume a certain size will fit. Improperly sized tires can lead to rubbing, damage to your vehicle, and safety issues. Always prioritize safety and proper installation.
