Ford Bronco Tire Size Guide
Factory tire sizes by trim, the biggest tire that fits at each lift height, and what Sasquatch changes, for the 2021+ Ford Bronco, backed by 63 real Bronco builds.
Quick Answer
Sasquatch Broncos come on 35 inch tires (315/70R17) from the factory. Non-Sasquatch Broncos top out at 33s from the factory, and most owners add a leveling kit and lower-offset wheels to fit 35s. In 63 owner-reported Bronco builds, 35s rarely rubbed (4 of 35 builds), but about half needed some metal trimming. 37s take more work: 5 of 14 builds on 37s reported rubbing, so plan on a lift, trimming or both.
Table of Contents
1. What You Need to Know First
Ford builds the Bronco on tires from about 30 inches tall on the Base up to 35s on Sasquatch trucks and 37s on the Raptor. How much bigger you can go depends on your package, suspension and wheel offset, not tire size alone.
| Trim or Package | Factory Tire | Approx. Height |
|---|---|---|
| Base | 255/70R16 | 30.1 in |
| Big Bend | 255/75R17 or 265/70R17 | 32.1 or 31.6 in |
| Outer Banks | 265/70R17 or 255/70R18 | 31.6 or 32.1 in |
| Badlands | 285/70R17 | 32.7 in |
| Sasquatch package, Heritage, Stroppe | 315/70R17 | 34.4 in |
| Bronco Raptor | 37x12.50R17 | 37 in |
Tire labels aren't exact. The factory Sasquatch "35" is a 315/70R17 that measures about 34.4 in, while a 35x12.50R17 runs closer to a true 35 in and needs more room. When a build is close, measure.
The Bronco Raptor is a separate fitment with a different bolt pattern, so this guide covers every Bronco except the Raptor.
2. Which Option Is Right for You?
The right tire depends on how you use your Bronco and how much work you want to put in.
3. Tire Size by Lift: Real Build Data
This table summarizes 63 owner-reported Ford Bronco builds (2022 to 2025, Raptor not included), counted by suspension and tire size. "Rubbed" includes slight rubbing at full steering lock. "Trimmed" means the owner reported cutting metal.
| Suspension | 33 in | 35 in | 37 in | 38 in and up |
|---|---|---|---|---|
| Stock | 8 builds · 3 rubbed, 4 trimmed | 5 builds · no rubbing, 2 trimmed | 1 build · no rubbing, 1 trimmed | – |
| Leveling kit | 3 builds · no rubbing | 15 builds · 3 rubbed, 7 trimmed | 2 builds · no rubbing, 1 trimmed | – |
| 2 to 2.5 in lift | – | 8 builds · no rubbing, 6 trimmed | 2 builds · 2 rubbed, 1 trimmed | – |
| 3 to 3.5 in lift | – | 4 builds · 1 rubbed, 2 trimmed | 6 builds · 2 rubbed, 2 trimmed | 2 builds · 1 rubbed, 1 trimmed |
| 4 in lift and up | – | 3 builds · no rubbing | 3 builds · 1 rubbed, 2 trimmed | 1 build · 1 rubbed |
What the data says: 35s are the Bronco's sweet spot, and leveled trucks are the most common way to run them. Rubbing on 35s is rare, but trimming is common, so budget for it. 37s rub more often: of the 9 builds on 37s with no rubbing, 6 run a 3 in lift or more and 5 needed trimming. Most builds on 35s and 37s run 12.50 in wide tires; the 13.50 in wide builds all needed trimming or rubbed.
4. Sasquatch vs Non-Sasquatch
The Sasquatch package is the biggest factor in Bronco tire fitment. Sasquatch trucks come from the factory with 35s, 17x8.5 wheels with a +30 offset, a higher ride height, and shorter gearing to turn the bigger tires. That's why they run 35s with no changes.
Non-Sasquatch trucks sit lower, use +55 offset wheels that tuck the tire in, and have taller gearing for 30 to 33 in tires. To fit 35s, most owners:
- Add a leveling kit to raise the front.
- Switch to wheels between +30 and 0 offset (see the Wheel Fitment Guide).
- Plan for some trimming, and in some cases remove the crash bars behind the front bumper.
Some owners skip the wheel shopping and buy Sasquatch takeoff wheels and tires, which bolt on as a set.
5. How Tire Size Affects Your Bronco
Bigger tires add ground clearance and traction, but they also change gearing, braking, speedometer accuracy and what fits in the wheel well.
Tire Sizing
Flotation sizes like 35x12.50R17 give height, width and wheel size directly. Metric sizes like 315/70R17 give width in millimeters and sidewall height as a percentage of width. A 315/70R17 is about 34.4 in tall and a 285/70R17 about 32.7 in.
Wheel Offset
Non-Sasquatch wheels use a +55 offset that tucks the tire toward the suspension, where 35s rub at full lock. In our build data, the most common wheel is a 17x8.5 with a 0 offset (10 builds, no rubbing reported), followed by 17x9 -12.
Gearing
A taller tire works like a taller gear, so the Bronco accelerates slower and the transmission works harder. Sasquatch trucks have shorter factory gearing to compensate; non-Sasquatch trucks on 35s and 37s feel it more. Call us and we'll talk through gearing for your truck.
Speedometer
With bigger tires, the speedometer reads slower than your actual speed, and shift points move. A programmer or tuner sets the new tire size so everything reads correctly.
Spare Tire
The Bronco carries its spare on the swing gate. A bigger, heavier spare puts more load on the gate and may need a different carrier or spacer to clear the tailgate. Check your rear camera view too.
6. Supporting Parts You May Need
Depending on your tire size, these parts help your Bronco clear, carry and drive on bigger tires.
7. Common Mistakes
- Putting 35s on factory non-Sasquatch wheels. The +55 offset tucks the tire into the suspension, where it rubs at full lock.
- Assuming no rubbing means no trimming. Most Bronco builds on 35s don't rub, but about half of them cut metal to get there.
- Going wider than you need. 12.50 in wide tires are the clean choice; every 13.50 in wide build in our data rubbed or needed trimming.
- Trusting the label. A 315/70R17 and a 35x12.50R17 are both sold as 35s, but the second is about half an inch taller.
- Skipping the speedometer fix. The truck reads slow and shifts at the wrong points until it's recalibrated.
8. Recommended Setup Paths
Sasquatch, keep it simple
- Factory suspension
- Factory 315/70R17s or 35x12.50R17
- 17x8.5 wheels, +30 to 0 offset
Non-Sasquatch to 35s
- Leveling kit
- 35x12.50R17 tires
- 17x8.5 wheels, 0 offset, plus trimming as needed
37s
- 3 in lift kit or more
- 37x12.50R17 tires
- 17x9 wheels, 0 to -12 offset, plus trimming
9. Frequently Asked Questions
What is the biggest tire that fits a stock Ford Bronco?
Sasquatch Broncos run 35 inch tires (315/70R17) from the factory. Non-Sasquatch Broncos come on tires up to about 33 in, and most owners add a leveling kit and lower-offset wheels before going to 35s.
Can a non-Sasquatch Bronco run 35s?
Yes. In our build data, 15 Broncos ran 35s on a leveling kit and 12 of them reported no rubbing. Most use wheels between +30 and 0 offset, and about half of those builds needed some metal trimming.
Is a 315/70R17 a 35 inch tire?
Close. A 315/70R17 measures about 34.4 in tall, which is why it's sold as a 35. A 35x12.50R17 is closer to a true 35 in and needs a little more room.
What lift do I need for 37s on a Bronco?
Most Broncos on 37s run a 3 inch lift or more, and many also need trimming. In our build data, 5 of 14 builds on 37s reported rubbing, so plan on lift, trimming and the right offset together.
Do I need to trim my Bronco for 35s?
Often, yes. In 63 owner-reported builds, about half of the trucks on 35s reported some metal trimming, even though only 4 of 35 reported rubbing. Sasquatch trucks on factory 35s don't need it.
Do bigger tires affect my Bronco's speedometer?
Yes. Taller tires make the speedometer read slower than you're actually going and change shift points. A programmer or tuner corrects the tire size in the truck's computer.
10. Related Guides
11. Sources & Technical References
- Factory tire sizes by trim: TireSize.com, 2025 Ford Bronco and Ford 2025 Bronco Technical Specifications
- 35s on non-Sasquatch Broncos: Bronco6G.com owner discussion
- Build data: 63 owner-reported Ford Bronco wheel and tire builds, 2022 to 2025 model years, compiled by Offroad Source.
Not sure what fits your Bronco? Call 419-670-3141 or email sales@offroadsource.info for a free fitment check. We also mount, balance and install at our shop in Paulding, Ohio.