Introduction
The best wheel size for off-roading is 17 inches for serious trail use, but there’s no right answer. The appropriate tire selection is based upon sidewall, overall size of the tire, the terrain, availability, brake clearance, vehicle application and fitment. A full wheel-and-tire package is more important than diameter alone.
17 vs. 18 vs. 20 Inches: Which Wheel Size Is Best for Off-Roading?
Seventeen-inch wheels are a good starting point for most trail-focused trucks and SUVs. They can supply additional rubber on the sidewall yet offer an extensive variety of off-road tires. Nonetheless, when the vehicle, tire selection, brakes, or intended use call for it, 18- and 20-inch wheels may also be suitable.
A fair comparison should keep the overall tire diameter similar. When a larger wheel is fitted around the same approximate diameter, the wheel is going to occupy more of the actual height of the tyre. There is less sidewall present between the rim and the mating surface.
Wheel Comparison by Size:
| Wheel size | Main advantage | Main trade-off | Typical application |
|---|---|---|---|
| 17-inch | More sidewall at a given overall tire diameter | Less emphasis on large-wheel styling | Trail use and mixed off-road builds |
| 18-inch | Balance between sidewall, road use, and appearance | Less sidewall than a comparable 17-inch setup | Mixed-use trucks and SUVs |
| 20-inch | Strong visual appeal and compatibility with some vehicle and brake packages | Less sidewall at a comparable tire diameter | Street-biased trucks, towing, and selected off-road use |
The existing advice on tires and wheels backs up this connection. The size of 17-inch wheels with 35-inch tires is said to be popular amongst off-road drivers, according to Discount Tire and other tire industry experts. Larger wheels generally leave less tire sidewall as overall tire size increases, but 18- and 20-inch truck wheels are still common for bigger trucks.
The availability of tires for a certain combination is another factor you need to recognize. A 33-inch tire is available for 17″, 18″, and 20″ wheels in many different configurations including 285/70R17, 275/70R18, and 275/60R20. The overall height of the tire will remain in the same general class while the diameter of the wheel changes.
This is the answer to “Are 17-inch wheels good for off-roading? Yes, for many trail-oriented builds; not automatic on every vehicle. An 18-inch arrangement can provide a practical compromise for mixed driving, while a 20-inch arrangement can be viable when greater weight is given to road use, factory gear, towing requirements, or looks.
It is important to keep in mind that 17-inch off-road wheels, 18-inch off-road wheels, and 20-inch off-road wheels need to be considered as complete tire packages, not wheel sizes.
Why Tire Sidewall is More Imaportant Than Wheel Diameter Alone
The tire’s sidewall is a crucial reason why wheel diameter affects off-road performance. The less space there is between the rim of a tire and the ground, the smaller the tire is. That extra sidewall increases tire profile, which increases sidewall flex to provide more compliance over rocks, ruts, and other uneven surfaces. It also provides the tire more room to deform when aired down properly.
A bigger wheel does not mean a bigger tire. It is possible to install a large off-road tire on a 20-inch wheel, depending on the tire, which then determines how much sidewall is left. The important question is therefore not simply whether the wheel measures 17, 18, or 20 inches. The wheel and tire combination spreads the tire height that is available.
Taking air out further alters the relationships. Decreasing tire pressure can enhance the tire’s footprint, while allowing the tread and sidewall to conform more closely to an uneven surface. According to Discount Tire, an increased sidewall can enhance traction and cushioning from tires aired down for off-road use.
The construction of a tire matters. Modern ranges of off-road tires have similar applications across 16-, 17-, 18-, and 20-inch wheel diameters. This indicates that buyers can access similar tire-size categories with different wheel sizes.
So, the tire sidewall, tire overall diameter, tire construction, and tire intended terrain should be considered before deciding on wheel diameter. The tire and vehicle should dictate the wheel, not the wheel, the tire, and vehicle.
Match Wheel Size to the Terrain and Driving Style
Due to varying terrains, no single best wheel size for off-roading because they have to do different things. Rugged technical rock trails prioritize sidewall and rim protection. Conversely, overland and mixed-use driving may necessitate a wider compromise with regard to trail performance, road comfort, tire availability, and vehicle fitment.
Best Wheel Size for Different Off-Roading Applications:
| Application | Practical direction | Main consideration |
|---|---|---|
| Rock crawling and rocky trails | 17-inch is often preferred | More sidewall and greater protection for the rim |
| Overlanding | 17–18 inch | Balance trail capability, tire choice, and road use |
| Mud | 17–18 inch | Tire construction, sidewall, and available tread sizes |
| Sand and desert | Vehicle and tire dependent | Tire footprint, pressure, and flotation matter |
| Daily-driven 4×4 | 17–20 inch | Road manners, appearance, tire selection, and clearance |
| Heavy truck or towing | Vehicle-specific | Brake clearance, load rating, and tire specification |
A smaller practical wheel diameter may be a better choice for rock crawling since, at a similar overall tire diameter, the tire can retain more sidewall. Space between the tire and wheel rim allows the tire to flex more on bumps and curbs, reducing rim damage. The wheel can still be damaged but at a lower level.
The choice for overlanding is much wider. A 17- or 18-inch setup gives the right balance should the vehicle spend significant time on pavement, but still needs appropriate tires for the trails. Availability of tires and factory specifications of the vehicle may also be as relevant as height.
When it comes to mud and sand, caution needs to be exercised before assigning a preferred diameter. The performance is affected by tire construction, tread design, vehicle weight, flotation, and operating pressure. All vehicles have their own recommended off-road tire pressure that is ideal for use. The tire manufacturer’s recommendations, the vehicle, load, and operating conditions determine the pressure changes.
Strong trucks create an additional constraint. The design choice may prioritize brake clearance and wheel load rating over a maximum sidewall preference. A wheel could be good on the trail, but that doesn’t mean it would work well on a load.
Why Wheel Width is Important and Why You Don’t Choose Diameter in Isolation
When it comes to wheel width for off-road, the next thing to decide once the diameter is fixed is the wheel width. The chosen width has to be in the approved range for every tire. The wheel width also affects the tyre’s seating on the wheel, how the sidewall is presented, and whether the whole package can be made to clear the suspension and bodywork of the vehicle.
Rather than setting a universal width for every tyre, tyre manufacturers specify the range for approved rim widths. Nitto, for instance, allows 7.5 – 10.0 inches of rim width for its 35×11.50R17LT Trail Grappler, the tyre with a 9.0-inch rim. The 315/70R17 Trail Grappler has an 8.0 – 10.5-inch approved rim width.
An example is given by the Cooper’s Discoverer STT Pro. It is of size 315/70R17. It uses a 9.5 inches measuring rim and a rim-width range of 8 inches to 11 inches. From this, we can infer that a tire’s diameter alone doesn’t help to determine its actual size.
A wider wheel doesn’t always mean that it is better to use with an off-road tire. If you are using a wheel wider than the tire manufacturer’s approved range, the intended tire profile and operating characteristics cannot be maintained.
So, a tire should be selected first, then the rim-width range should be checked, and finally, a wheel width that can also fit the vehicle’s clearance and load requirements should be chosen.
This makes tire-to-wheel fitment a specification decision, not a styling preference.
Fitment Check: Offset, Backspacing, Brake Clearance and Bolt Pattern
Wheel diameter and width are only half of the fitment. Another thing that must be checked before purchasing off-road wheels is the complete specification fitment against the vehicle. The reason why a 17-inch wheel may not fit if it doesn’t have the right offset, backspacing, center bore, brake clearance, and load rating that the vehicle requires.
Practically, the whole thing is straightforward and easy. Begin by knowing the vehicle and the type of tire you plan on using. Choose a wheel diameter and width set accompanied by the number of bolts, lug pattern, and center bore. Check offset and backspacing.
After that, make sure the wheel will have available clearance around the brakes, suspension components, and fenders at all of the relevant steering and suspension positions the vehicle uses.
Bolt pattern is specifically important when considering truck applications with KIPARDO 6×139.7 wheels relevant where a PCD of 6×139.7 is used.8×170 wheels and 8×180 wheels are strictly for different heavy-duty truck fitment needs. It should never be misunderstood that these specifications are interchangeable just because the wheels have the same diameter. 6×139.7 wheels 8×170 wheels 8×180 wheels.
The offset and backspacing are primarily responsible for the position of the wheel concerning the hub and various parts around it. If these numbers are changed, so will the inner suspension clearance and the outer fender position, and we shouldn’t approve larger or smaller diameter wheels from the numbers alone.
For a detailed, vehicle-specific specification of any existing KIPARDO fitments, the present fitment guides are well equipped to offer the deeper model and year information, which doesn’t have to be duplicated in this article, and the point of the guide is to show how to evaluate all fitments properly before deciding wheel size.
Wheel Construction
When picking the perfect wheel for your off-road truck or trail rig, there is much more to think about than just the diameter of the wheel. All cast alloy wheels, flow-formed wheels, and forged alloy wheels will have different manufacturing processes; everything from their weight and general material properties to design options and final cost will be influenced by the type of wheel and the manufacturing method used.
The method of construction alone cannot determine if a wheel is going to be trail- or truck-worthy. The flow forming begins with a cast component. Then, controlled pressure is added to the rim section as it turns. This can decrease the thickness of the rim wall and improve all mechanical properties versus conventional casting.
Forging uses a lot more deformation of the aluminum and allows for high strength-to-weight ratios. However, it generally comes with a higher cost compared to any other type of manufacturing option.
The engineering, load rating, testing, design, and intended use of the wheel still matter. Although a properly engineered cast wheel can be appropriate for many uses, it does not automatically make a forged wheel a better choice for nearly every off-road vehicle.
It is also important that the marketing terminology is not confused with construction. There is a category of aftermarket wheels, and another is replica wheels, but these are not methods of manufacturing.
Similarly, when someone refers to a forged monoblock, forged 2-piece, or a forged 3-piece wheel, they are describing forged configurations. When comparing off-road wheels for sale, many of KIPARDO’s forged off-road wheels and forged truck wheels are examples of complete specifications, not by construction label alone.
Three Real-World Wheel-Size Scenarios
The 17-inch wheel is much easier to choose than an 18- or 20-inch wheel when seen through the same use scenarios. The Toyota Tacoma can be a visualization of how the wheel diameter relates to tire sidewall, road use, fitment, and the application requirements.
Case 1: Mid-Size Truck With a 17-Inch Setup
For instance, a 17-inch wheel and 33- to 35-inch-class off-road tire are quite a good option for the Toyota Tacoma. The wheels can also be included with an immense sidewall in the overall tire size range, as it is more popular with trail-focused driving. The Tacoma also normally uses the 6×139.7 PCD; however, exact fitment will need to check the offset of the center bore, brake clearance, and suspension clearance.
A KIPARDO KF47 is 17×9 with a 6×139.7 fitment, with a listed maximum load of 2,600 lb per wheel.
Case 2: Mixed-Use Truck With an 18-Inch Setup
An 18-inch wheel is perfect for a truck that spends a decent amount of time on tarmac but requires all-terrain abilities. The KF66 will be available in 18×8.5 and 18×9, including fitment of 6×139.7. The construction will have a flow-form. It shows an 18-inch package can have a more road-focused use but engages in off-road fairly easily and without moving to a 20-inch wheel automatically.
Case 3: Street-Biased 4×4 With a 20-Inch Setup
A 20-inch wheel can be an acceptable specification for a truck or SUV when road use, appearance, and vehicle parameters carry greater importance. The KF53 20×10 6×139.7 ET -18 CB 106.1 has a max load rating of 2,600 lb per wheel. That specification is not enough to make it suitable for extreme trails. The suitability still depends on the complete tire, vehicle clearance, load, and intended terrain.
How to Choose the Best Off-Road Wheel Size: A Practical Decision Checklist
These are the checklist for choosing the best wheel size for off-roading according to Kipardo experts.
What Should Distributors and Retailers Stock?
When distributors and retailers choose wheel sizes for trucks, they also make an inventory decision. The estimated demand in the target market must be calculated by referencing the following: Vehicle population. Tire availability. PCD patterns, widths, offsets, load ratings, finishes, minimum order quantity, replacement demand.
A good strategy is to prioritize specifications with multiple vehicle applications without too much inventory complexity. These examples for wheels, having a specification of 6×139.7, are common across several mid-size truck and SUV platforms. 8-lug specifications have distinct heavy-duty applications.
It is possible to offer 17-, 18-, and 20-inch off-road wheels with varying fitment specifications, as demonstrated by KIPARDO. As a result, for B2B buyers, the most important stocking decision is not just the most common diameter, but the combination of diameter, PCD, width, offset, load rating, and tyre demand.
Conclusion
Not solely the diameter, but the whole size of the wheel matters for off-roading. The practical approach would be a seventeen-inch wheel. However, the recommendations will vary based on the tire size and its sidewall, type of terrain, wheel width, clearance, load requirements, and type of vehicle use. The setup that harmonizes evenly with all these factors is the strongest setup.
Frequently Asked Questions
Can a 20-Inch Wheel Be Used for Serious Off-Road Driving?
With the proper wheel-and-tire package matched to the vehicle, a 20-inch wheel can be used for serious off-road driving. Yet, if the technical terrain has no-site restrictions, the smaller wheel diameters can still provide more tire sidewall at a similar overall tire diameter. The vehicle’s ground clearance, the availability of tyres, and the load rating along terrain also need to be considered.
