Choosing among BFG KO2 sizes starts with your vehicle, not the largest tire that will fit on the wheel. The right choice must match the vehicle’s approved size and load requirements, suit the wheel, and clear the brakes, suspension and body through normal steering and suspension movement. A larger KO2 may provide more ground clearance, but it can also affect handling, ride, speedometer readings and fuel use. Before buying, compare the complete tire specification—not just the width or overall diameter—and confirm that the specific size is suitable for your vehicle and intended use.
A tire size is a coded description, not a complete fitment approval. In a metric size such as 265/70R17, 265 is the nominal section width in millimetres, 70 is the sidewall height expressed as a percentage of that width, R indicates radial construction, and 17 is the wheel diameter in inches. A size code does not, by itself, tell you whether the tire’s load capacity or construction suits your vehicle.
As a rough comparison tool, the nominal diameter of a metric tire can be estimated by adding the wheel diameter to twice the sidewall height. For 265/70R17, that gives a theoretical diameter of about 31.6 inches. This is a calculation from the size code, not a guaranteed measured diameter for a particular KO2. Actual dimensions can differ by tire model, rim width and measurement conditions, so use the manufacturer’s specifications when checking clearance.
KO2 listings may use different sizing conventions, depending on the particular product. Passenger-metric sizes can begin with a P, while light-truck metric sizes begin with LT. Flotation sizes use inch-based figures, such as 33x12.50R17LT: the first number is the nominal overall diameter, the second is nominal width, R denotes radial construction, 17 is the wheel diameter and LT identifies a light-truck tire. These examples explain how to read the formats; they do not confirm that a specific size is currently offered in the KO2 range or approved for your vehicle.
Look beyond the main size code. The complete sidewall designation can include a load index and speed rating, and an LT tire may also show a load range. These details matter because two tires with similar dimensions may have different carrying capacity or construction. Match the complete specification to your vehicle’s requirements rather than treating the size numbers as interchangeable.
When considering a change from the current tire, compare the alternatives across several factors. A similar nominal size may be the straightforward replacement, while a taller or wider size needs more checks. The right choice depends on the vehicle’s approved fitments, its wheels and how you drive.
| Size choice | Potential reason to choose it | Main trade-off or risk | What to verify |
|---|---|---|---|
| Vehicle-approved replacement size | Preserves the intended fitment when the load and service specifications also match. | May not provide the extra clearance or appearance some drivers want. | Exact size, load index, speed rating and tire pressure requirements. |
| Taller tire | Can increase nominal ground clearance if the vehicle can accommodate it. | May rub, alter gearing and change speedometer or odometer readings. | Actual tire dimensions, suspension and body clearance, wheel fitment and any vehicle-specific restrictions. |
| Wider tire | May suit a particular wheel and use when the vehicle is approved for that width. | Can reduce clearance to suspension or body parts and may change steering feel. | Approved rim-width range, wheel offset, clearance and load capacity. |
| LT or flotation alternative | May be appropriate for a vehicle or workload that requires the corresponding tire construction and capacity. | Can differ in weight, ride characteristics and pressure requirements from a passenger-metric tire. | Vehicle load needs, tire load data, wheel compatibility and suitable inflation pressure. |
The table is a comparison framework, not a promise that every option is available for every KO2 application. In particular, “same width” does not mean “same fit.” A change in sidewall height affects overall diameter, while a different construction or load rating can change the tire’s suitability even if its headline dimensions appear close.
If the fitment is outside the vehicle manufacturer’s listed options, ask the installer to explain what has been checked and what remains uncertain. A shop’s ability to mount a tire does not establish that it clears safely or preserves the vehicle’s intended load capacity.
A taller tire can increase the distance between the axle and the ground, but the gain depends on the actual size difference and vehicle geometry. The same change can reduce clearance at the wheel arch or suspension, particularly while turning or when the suspension compresses. A static gap in a driveway is not enough to establish that a larger fitment will avoid rubbing in use.
Increasing overall diameter also changes the relationship between wheel rotation and distance travelled. The speedometer and odometer may no longer reflect the same relationship as they did with the original tire size, and the effective gearing changes. Depending on the vehicle and the size of the change, drivers may notice differences in acceleration, braking response or shifting behaviour. Electronic vehicle systems can also rely on wheel-speed information, so avoid assuming that a size change is inconsequential.
Width matters too. A wider tire can sit closer to suspension components or extend farther toward the fender, depending on the wheel’s width and offset. It may also change steering feel. If a tire rubs, the contact point and circumstances matter; simply trimming, lifting or changing pressure is not a universal fix. Resolve the cause with a fitment professional before driving the vehicle normally.
KO2 tires with similar dimensions can have different load specifications or construction. Match the selected tire to the loads the vehicle is designed to carry, including regular passengers, cargo and towing where relevant. Never choose a tire solely because its larger appearance suggests it must be stronger; check its stated load capacity and the vehicle’s requirements.
Pay particular attention when moving between passenger-metric and LT tires. The labels indicate different tire categories, and the load capacity and pressure relationship cannot be assumed from the size code alone. A suitable replacement must be assessed using the tire maker’s load information and the vehicle’s requirements. Ask the installer to verify the load capacity at the pressure appropriate for the vehicle, not just confirm that the tire fits the rim.
Pressure affects carrying capacity, tire wear and ride. The maximum pressure printed on a sidewall is not automatically the correct everyday setting for your vehicle. For a changed fitment, use guidance specific to the vehicle and tire; do not copy another vehicle’s pressure or reduce pressure to try to cure rubbing.
Before ordering, write down the vehicle’s approved size, the complete KO2 designation, wheel specifications and the result of the clearance and load checks. If any of those details are unknown, resolve them before installation rather than relying on a visual comparison.
Start with the driver-door tire placard and owner’s manual, then match the complete KO2 specification to the vehicle’s approved size, load and speed requirements. If you are changing wheel or tire dimensions, confirm wheel compatibility and clearance with a qualified fitment professional.
A larger overall tire diameter can increase nominal ground clearance, but the change depends on the actual dimensions and vehicle setup. A larger tire can also reduce clearance at the fenders or suspension and may affect the speedometer, gearing and driving behaviour.
Possibly, but the placard should be treated as the starting point, not ignored. An alternate size needs to be checked for load capacity, wheel compatibility, clearance through steering and suspension movement, and any vehicle-specific effects. Do not rely on another owner’s fitment as proof that it suits your vehicle.
Not automatically. They can differ in construction, load capacity and pressure requirements, even when their nominal dimensions are similar. Confirm that the tire is appropriate for your vehicle’s loads and have the required pressure checked using the relevant tire data.
A comparison of nominal size can flag a potential issue, but it cannot confirm clearance on its own. Wheel width, offset, suspension condition and modifications all matter. Have the fitment checked through full steering lock and suspension travel before relying on a new size.
Not as a default. Use the vehicle’s recommended cold pressure for an approved original-size replacement; for a changed size or construction, get pressure guidance that accounts for the vehicle and tire’s load requirements. The sidewall maximum is not a substitute for a vehicle-specific recommendation.
The best BFG KO2 size is the one that meets your vehicle’s approved load and fitment requirements while providing the clearance and capability you actually need. Verify the complete tire specification and wheel compatibility before ordering; if you are moving away from the factory size, have the fitment and pressure checked professionally before driving on it.
