The 2015 RAM Trucks 3500 Big Horn sits in a heavy-duty pickup segment where tire choice affects more than appearance alone. This is a truck often used for hauling, towing, and long-wheelbase work, so matching the tire to the exact configuration matters right away. Depending on whether the truck is single rear wheel or dual rear wheel, the primary fitment changes among 275/70R18, 285/60R20, and 235/80R17 radial sizes. Available choices here center less on switching construction and more on confirming the correct wheel setup, load-oriented specifications, and sidewall presentation. Before selecting a tire, verify the truck's exact sub-model and current wheel diameter.
Which Tire Size Is Right for The 2015 RAM Trucks 3500 Big Horn
Three primary tire sizes apply to the 2015 RAM Trucks 3500 Big Horn, and the right one depends on the exact sub-model and wheel diameter. Single rear wheel 4x2 and 4x4 trucks use either 275/70R18 or 285/60R20, while dual rear wheel versions use 235/80R17. Confirming whether the truck is DRW or non-DRW, then checking the actual rim diameter, is the first step before comparing tire choices.
275/70R18 is a metric radial size in which 275 indicates section width in millimeters, 70 is the aspect ratio, R denotes radial construction, and 18 is the rim diameter in inches. On the 2015 RAM Trucks 3500 Big Horn, this size is used on certain single rear wheel 4x2 and 4x4 configurations. Available product choice in this size includes BFGoodrich's All-Terrain T/A KO2 with a raised white letter sidewall. This size is worth considering when the truck already runs 18-inch wheels and the goal is to stay with the correct SRW fitment and load-oriented tire format.
285/60R20 is a metric radial size that uses a 285-millimeter nominal section width, a 60-series profile, and a 20-inch rim diameter. For the 2015 RAM Trucks 3500 Big Horn, this size belongs to certain single rear wheel 4x2 and 4x4 setups rather than the dual rear wheel trucks. Its lower-profile metric format makes wheel diameter confirmation especially important before selection. Choose this size only when the truck is equipped with the corresponding 20-inch wheel package and the overall wheel-and-tire combination matches the vehicle's present configuration.
235/80R17 is a metric radial size with a 235-millimeter nominal section width, an 80-series profile, and a 17-inch rim diameter. On the 2015 RAM Trucks 3500 Big Horn, this size is used on dual rear wheel 4x2 and 4x4 models, making it a different fitment path from the single rear wheel trucks. BFGoodrich offers this size in the All-Terrain T/A KO2 series with an RBL sidewall. This is the size to evaluate when the truck is a DRW configuration and the wheel setup needs to stay aligned with that heavier-duty application.
Sub-model fitment matters on the 2015 RAM Trucks 3500 Big Horn because tire size changes between single rear wheel and dual rear wheel configurations. Non-DRW trucks use either 18-inch or 20-inch fitments, while DRW versions use a 17-inch tire size, so identifying the exact sub-model prevents choosing the wrong rim diameter.
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2015 RAM Trucks 3500 Big Horn 4x2
The 2015 RAM Trucks 3500 Big Horn 4x2 uses single rear wheel fitments and may take either 275/70R18 or 285/60R20 radial tires. Tire selection starts with confirming which wheel diameter is actually on the truck, then comparing options within the matching size.
The 2015 RAM Trucks 3500 Big Horn 4x2 (DRW) uses the 235/80R17 radial size rather than the larger single rear wheel fitments. That makes DRW identification essential, especially before comparing load-oriented specifications or choosing among available product details.
The 2015 RAM Trucks 3500 Big Horn 4x4 follows the same single rear wheel size path as the 4x2 version, using either 275/70R18 or 285/60R20 radials. The practical decision is to confirm the current 18-inch or 20-inch wheel setup before narrowing down the correct tire.
The 2015 RAM Trucks 3500 Big Horn 4x4 (DRW) uses 235/80R17 radial tires, separating it clearly from the non-DRW 4x4 trucks. For tire selection, the key is staying with the proper DRW wheel and tire format instead of assuming the single rear wheel sizes apply.
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 2015 RAM Trucks 3500 Big Horn Tires for Sale
Available product choices center on BFGoodrich All-Terrain T/A KO2 offerings in the applicable sizes, with differences in sidewall style and rim-width compatibility depending on whether the truck uses 17-inch or 18-inch wheels.
Tire questions for the 2015 RAM Trucks 3500 Big Horn usually come down to exact size, SRW versus DRW fitment, wheel diameter, and comparing available all-terrain tire options. The answers below focus on those practical decisions before road use.
Tire Size & Fitment
What tire size fits a 2015 RAM Trucks 3500 Big Horn?
The 2015 RAM Trucks 3500 Big Horn uses three primary radial tire sizes: 275/70R18, 285/60R20, and 235/80R17. Single rear wheel 4x2 and 4x4 trucks use either 275/70R18 or 285/60R20, while dual rear wheel versions use 235/80R17.
The important step is identifying whether the truck is SRW or DRW and then confirming the actual wheel diameter on the vehicle. A 17-inch DRW setup is not the same fitment situation as an 18-inch or 20-inch SRW truck, so tire selection should begin with the exact sub-model and wheel configuration.
What size rim does a 2015 RAM Trucks 3500 Big Horn use?
The 2015 RAM Trucks 3500 Big Horn uses 17-inch, 18-inch, or 20-inch rims depending on configuration. The 235/80R17 size pairs with a 17-inch rim on DRW trucks, while SRW versions use either 275/70R18 on an 18-inch rim or 285/60R20 on a 20-inch rim.
Rim diameter should be checked before looking at tread style or brand because the three fitments are not interchangeable by size name alone. Measuring the wheel or confirming the marking on the current tire helps avoid choosing a tire built for a different wheel diameter than the truck actually carries.
Why does the 2015 RAM Trucks 3500 Big Horn have more than one tire size?
More than one tire size applies because the 2015 RAM Trucks 3500 Big Horn was offered in different wheel and rear-wheel configurations. Single rear wheel trucks use either 275/70R18 or 285/60R20, while dual rear wheel models use 235/80R17.
That means the correct tire is tied to the truck's exact setup rather than the model name alone. Buyers should verify whether the truck is 4x2 or 4x4, confirm if it is DRW, and check the installed wheel diameter, especially if the truck has been changed from its original wheel package.
Choosing the Right Tire
What should I consider when choosing a tire for a 2015 RAM Trucks 3500 Big Horn?
Start with the correct primary size for the truck's exact configuration: 275/70R18, 285/60R20, or 235/80R17. From there, compare construction, load-oriented specifications, sidewall style, rim-width compatibility, and whether the truck is single rear wheel or dual rear wheel.
The best comparison is the one that matches how the truck is actually used. A heavy-duty pickup that tows, hauls, or sees mixed road and unpaved use benefits from checking load capacity, wheel fit, and the tire's overall character rather than choosing only by appearance or wheel diameter.
What sidewall styles are available for 2015 RAM Trucks 3500 Big Horn tires?
The available sidewall styles here include RWL and RBL, depending on tire size. The 275/70R18 BFGoodrich All-Terrain T/A KO2 uses an RWL sidewall, while the 235/80R17 version uses an RBL sidewall.
Sidewall style mainly affects presentation, but it can still matter on a truck where appearance and use both count. Once the correct size and wheel diameter are confirmed, sidewall treatment becomes part of the final decision, especially if the goal is to balance an all-terrain look with the truck's existing visual setup.
What brands offer tires for the 2015 RAM Trucks 3500 Big Horn?
BFGoodrich is represented in the available products for the 2015 RAM Trucks 3500 Big Horn. The current choices shown here are BFGoodrich All-Terrain T/A KO2 tires in applicable 17-inch and 18-inch fitments.
That makes the main comparison less about brand switching and more about choosing the right size, wheel match, and sidewall presentation for the truck's configuration. It is still worth checking the tire's rim-width range and load specification so the selected product aligns with the truck's intended work or road use.
Restoration & Appearance
Does correct tire fitment matter for a 2015 RAM Trucks 3500 Big Horn restoration?
Correct tire fitment matters even on a newer heavy-duty truck because wheel diameter and rear-wheel configuration are central to how the 2015 RAM Trucks 3500 Big Horn sits and functions. Using a DRW size on an SRW truck, or choosing the wrong 18-inch versus 20-inch fitment, changes more than appearance.
A restoration-minded owner should treat the exact sub-model and wheel setup as the starting point, then choose a tire that supports the intended look and use. When originality matters closely, compare the truck against build information, period photos, or marque-specific references before settling on a final wheel-and-tire presentation.
How does tire construction affect the appearance of a restored 2015 RAM Trucks 3500 Big Horn?
Construction is straightforward here because the primary fitments for the 2015 RAM Trucks 3500 Big Horn are radial tires. That means the appearance decision leans more toward size, wheel diameter, and sidewall treatment than toward choosing between bias-ply and radial construction.
Visual character still changes noticeably between an 18-inch, 20-inch, or DRW 17-inch setup, especially once sidewall style is considered. A truck being brought back to a period-style presentation should keep its exact wheel format in view first, then choose the tire that best matches that stance and overall finish.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2015 RAM Trucks 3500 Big Horn?
Yes, modifications can change tire fitment on a 2015 RAM Trucks 3500 Big Horn even when the tire size sounds close to stock. Aftermarket wheels, altered offsets, suspension lifts or drops, and conversions between wheel styles can all affect how 275/70R18, 285/60R20, or 235/80R17 tires sit on the truck.
A truck with changes should be checked for actual wheel diameter, rim width, and clearance at steering and suspension travel before replacing tires. That matters even more on a DRW setup, where tire spacing and wheel choice are part of the fitment equation rather than simple appearance details.
What should I inspect before driving a 2015 RAM Trucks 3500 Big Horn on new tires?
Before road use, inspect inflation pressure, lug torque, valve stems, tread seating, and visible clearance around suspension, bodywork, and steering components. On a 2015 RAM Trucks 3500 Big Horn, it also makes sense to confirm that all tires match the correct size for the truck's SRW or DRW configuration.
A short initial drive followed by a recheck can help catch rubbing, air loss, or installation issues early. Heavy-duty trucks place real demand on tires, so the owner should also pay attention to any vibration, uneven stance, or contact marks that suggest a mismatch between the tire and wheel setup.
How often should tires on a 2015 RAM Trucks 3500 Big Horn be inspected?
Tires on a 2015 RAM Trucks 3500 Big Horn should be inspected regularly, not just at replacement time. A practical routine includes checking pressure and visible condition before longer drives and looking more closely for cracking, cuts, bulges, irregular wear, and air loss as part of normal service.
Heavy-duty use makes those checks especially worthwhile because towing, hauling, and long highway miles can expose fitment or wear issues quickly. Trucks that sit for stretches still need attention, since age, storage conditions, and underinflation can affect a tire even when tread depth still appears serviceable.
