Early Ford Bronco biggest tire size: stock and lifted
The biggest tire owners run on a Ford Bronco (1966–1977) at every lift height, with the trimming it takes, the wheel specs you need and the lift kits that get you there.
On an uncut truck at stock height, Performance Plus Tire calls 30x9.50R15 the safe choice and says 31x10.50R15 may lightly rub at full stuff or full lock. ClassicBroncos owners agree: 235/75R15 bolts on, and a few squeeze 33x9.50s on with fender trimming and some rubbing. For 31–32-inch tires on uncut fenders, plan on a 2–3-inch lift and 3.75–4.25 inches of wheel backspacing; 33x12.50s generally mean cut fenders.
Biggest Early Ford Bronco tire at every lift
| LIFT | BIGGEST TIRE | WHAT IT TAKES |
|---|---|---|
| Stock | 30x9.50R15 | The safe choice on uncut fenders; 31x10.50R15 may lightly rub at full stuff or full lock, and 235/75R15 bolts on |
| 2–3 in | 31x10.50R15 (up to 32 in) | Uncut fenders, with 3.75–4.25 in of wheel backspacing |
| 2–4 in, cut fenders | 33x12.50R15 | Rear fenders cut for flares; backspacing 3.25–3.75 in. Check caster and C-bushings after lifting |
| Bigger lift plus body work | 35x12.50R15 | Bigger suspension or body lift and trimming |
Early Ford Bronco wheel and tire specs
| Factory tire sizes | G78-15 and similar bias-ply sizes on 15-in steel wheels (factory) · H78-15 largest factory option (1970 owner's manual, as quoted on ClassicBroncos) |
|---|---|
| Bolt pattern | 5x139.7 (5x5.5") |
| Wheel offset | Backspacing 3.75–4.25 in for uncut fenders (Performance Plus Tire) |
Lift kits, wheels and tires for the Early Ford Bronco
New coils and leaf springs undo decades of sag, and a 2.5–3.5-inch lift clears 31–33-inch tires. Match the C-bushings to the lift height so caster stays positive.
Fitment comes from owners and specialists; wheel width, offset, trimming and bump stops change what fits. Check clearance at full lock and full flex before you buy. Some links are affiliate links.