2021 RAM Trucks Tire Fitment Guide

2021 RAM Trucks use 11 sizes across four model lines: 275/55R20, 275/65R18, 285/45R22, 275/70R18, and 325/65R18 for the 1500; 265/70R17 and 275/60R20 for the 1500 Classic; 275/70R18, 285/60R20, 285/70R17, and 245/70R17 for the 2500; and 275/70R18, 285/60R20, and 235/80R17 for the 3500. Rim diameters span 17, 18, 20, and 22 inches, and where rim-width guidance exists it ranges from 6.0 to 9.5 inches depending on size.

That means year and make alone are not enough for this RAM lineup. Start by identifying whether your truck is a 1500, 1500 Classic, 2500, or 3500, then confirm the wheel diameter already on the truck. If the truck has had wheel or tire changes over time, compare the sidewall size on the current tire to the original fitment path before choosing a replacement.

On a 2021 RAM Trucks tire, 275/70R18 means the tire is 275 millimeters wide, has a 70-series aspect ratio, uses radial construction, and fits an 18-inch wheel. This size appears on the 1500, 2500, and 3500, making it one of the few crossover fitments in the 2021 RAM range. Available versions here use an R speed rating, which carries a 106 mph ceiling, and fit rims from 7.0 to 9.0 inches wide.

That combination of shared use and 18-inch wheel fitment makes 275/70R18 a good reminder that some RAM sizes cross model boundaries while many others do not. If your truck already wears 18-inch wheels, this size is worth checking first, but you should still confirm the exact model and door-jamb specifications before assuming every 18-inch RAM wheel was intended for the same tire.

No, 2021 RAM Trucks models do not all use the same tire size. The 1500 alone uses five sizes, the 1500 Classic uses two, the 2500 uses four, and the 3500 uses three. Only a few sizes are shared across more than one model, including 275/70R18 across the 1500, 2500, and 3500, and 285/60R20 across the 2500 and 3500.

That variation reflects how different the trucks are in wheel diameter, stance, and duty level. A half-ton 1500 and a heavy-duty 3500 may both be RAM pickups from the same year, but they do not follow the same fitment rules. If you are comparing trucks or buying tires for a newly acquired RAM, confirm the exact model badge and the size stamped on the current tire before moving on.

2021 RAM Trucks tires here appear with two sidewall styles depending on size: RWL and RBL. The 275/65R18, 275/70R18, 265/70R17, 285/70R17, and 245/70R17 use RWL sidewalls, while the 235/80R17 uses an RBL sidewall. Both are radial truck tire presentations, but they create a different visual effect on the vehicle.

For a buyer who cares about appearance as much as fitment, sidewall style is worth checking before choosing a tire. RWL gives a more traditional off-road and truck-oriented look, while RBL is more subdued and utilitarian. If your goal is to preserve the visual character of a particular wheel-and-tire package, compare the sidewall treatment on the truck now with the look you want to keep.

BFGoodrich is the brand represented across the available 2021 RAM Trucks products here. The covered sizes include 275/65R18, 275/70R18, 265/70R17, 285/70R17, 245/70R17, and 235/80R17, all in BFGoodrich all-terrain radial form. That gives the available range a consistent truck and SUV focus rather than mixing highway, vintage, and specialty brands.

For the buyer, that means the first decision is not really between multiple brand families but between the correct size, load version, speed rating, and sidewall style within the fitments that apply to the truck. If your priority is keeping a consistent appearance and behavior across a set, a single-brand offering can simplify that process as long as the exact size and service range match your RAM's use.

The available 265/70R17 choices for 2021 RAM Trucks 1500 Classic are both BFGoodrich All-Terrain T/A KO2 radials with RWL sidewalls, but they differ in load capacity, pressure, and weight. One version carries a 112S service description with a maximum load of 2,470 pounds at 50 psi and weighs 45.7 pounds. The other carries a 121S service description with a maximum load of 3,195 pounds at 80 psi and weighs 53.5 pounds.

That difference matters most if the truck's use leans more toward light everyday duty or heavier hauling expectations within the capabilities of the vehicle. Two tires can share the same basic size while serving different load and pressure needs. Compare the service description on the truck now, then match the replacement to the way the 1500 Classic is actually used rather than choosing by size alone.

Where rim-width guidance is available for 2021 RAM Trucks, it varies by size. The 275/65R18 fits 7.5 to 9.5-inch rims, 275/70R18 fits 7.0 to 9.0, 265/70R17 fits 7.0 to 9.0, 285/70R17 fits 7.5 to 9.5, 245/70R17 fits 6.5 to 8.0, and 235/80R17 fits 6.0 to 7.5. Those ranges are tied to the specific tire size, not to RAM trucks as a whole.

Rim width matters because it affects how the tire's section width and tread sit on the wheel. Even when two sizes share the same rim diameter, they may not share the same acceptable wheel-width range. Before changing from one stock size to another, confirm the wheel width already on your truck and compare it to the acceptable range for the exact tire you plan to use.

2021 RAM Trucks sizes here are modern radial truck tires, and the available product markings do not indicate tube-type fitments. The covered 17- and 18-inch products use contemporary radial sizing and service descriptions rather than tube-type markings such as TT. That points buyers toward standard tubeless-style truck tire applications unless a wheel itself has been changed to something unusual.

The practical check is the wheel, not just the tire. If your RAM still uses normal late-model truck wheels, inner tubes are generally not part of the setup. If the truck has aftermarket wheels, beadlock-style hardware, or a repair history that changes how the wheel seals, inspect the wheel condition and valve stems carefully before refitting tires.

No, the original 2021 RAM Trucks wheels cannot be treated as universal across all tire sizes because the lineup uses multiple rim diameters. The size range includes 17-, 18-, 20-, and 22-inch applications, so a tire must match the wheel diameter exactly. Some sizes share a diameter across different models, but that does not automatically make every wheel interchangeable.

A 17-inch RAM wheel can only take a 17-inch tire, an 18-inch wheel can only take an 18-inch tire, and so on. After diameter, confirm the wheel width against the tire's approved range if that information is available for your size. That step is especially important if you are moving between stock wheel packages or using take-off wheels from another RAM truck.

A 2021 RAM Trucks vehicle should be stored on clean, properly inflated tires away from direct sunlight, electric motors, welders, battery chargers, and other ozone sources that accelerate rubber aging. Keep the truck on a dry surface, avoid prolonged contact with standing moisture, and move it periodically if it will sit for long stretches. Modern radials resist temporary flat-spotting better than older bias-ply tires, but static storage still hardens rubber over time.

If the truck will be parked for a season, check inflation before and after storage and consider rolling it occasionally to change the contact patch. Owners storing a heavy-duty 2500 or 3500 should be especially mindful of inflation because vehicle weight can work the tire carcass even while parked. Clean, shaded, cool storage does more for tire life than simply covering the tread.

Tires on a 2021 RAM Trucks vehicle should be judged more by age and condition than by mileage alone, especially if the truck sees seasonal or low annual use. A good rule is to begin close inspection around five to seven years of age and to give serious replacement consideration as a tire approaches about ten years, even if tread depth still looks serviceable. The DOT date code on the sidewall is the key reference for age.

Truck tires can appear healthy while the rubber compound and internal structure are already aging out. Heat cycles, sun exposure, storage conditions, towing loads, and underinflation all matter as much as tread wear. If you have recently bought a used 2021 RAM and the tires are original or near-original age, check the date codes first before assuming the tire is ready for another long service interval.

Tires on a 2021 RAM Trucks vehicle should be inspected before every drive and again before any longer highway or towing trip. Look for sidewall cracking, cuts, punctures, bulges, uneven wear, and signs of impact damage, and verify that each tire is holding pressure consistently. On trucks that work hard or carry heavier loads, regular pressure checks are just as important as visual inspection.

A quick walk-around can catch a problem before it becomes a roadside failure. Pay attention to shoulder wear, embedded stones, and any vibration or pull that starts to develop after installation or rotation. If one tire begins losing pressure faster than the others, inspect the valve stem and wheel sealing surfaces as well, since the issue may not be the tread area itself.

Yes, the available 2021 RAM Trucks tires here are modern radial truck tires suitable for normal road use when the correct size, load range, and pressure are matched to the truck. Speed ratings vary by size and version: S carries a 112 mph ceiling, R carries a 106 mph ceiling, and Q carries a 99 mph ceiling. Those ratings are well above ordinary highway speeds, but they do not override the truck's load condition, inflation state, alignment, or overall mechanical health.

Highway safety depends on choosing the right service description for the truck as much as choosing the correct dimensions. A lightly used 1500 Classic and a working 2500 can share an all-terrain tire family yet need different load capability. Before a long interstate run, confirm pressure cold, inspect for damage, and make sure the truck's suspension and steering components are in equally sound condition.

Inflation pressure for 2021 RAM Trucks tires depends on the exact size and version. Available examples include 2,470 pounds at 50 psi for one 265/70R17, 2,755 pounds at 50 psi for one 285/70R17, 3,000 pounds at 80 psi for 245/70R17, 3,085 pounds at 80 psi for 235/80R17, 3,195 pounds at 80 psi for one 265/70R17 and one 285/70R17, 3,415 pounds at 80 psi for 275/65R18, and 3,640 pounds at 80 psi for 275/70R18.

Those figures are the tire's rated load-and-pressure limits, not a universal inflation target for every RAM application. Use the factory door-jamb or owner's manual recommendation as the starting point for stock fitments, then confirm that the chosen tire's service description supports the truck's real load and use. Do not move a pressure figure from one size to another just because the trucks are from the same year.

Before a longer drive in a 2021 RAM Trucks vehicle, inspect each tire for cracking, cuts, punctures, bulges, uneven wear, and any object embedded in the tread. Verify cold inflation pressures, check that the spare is usable and inflated, and look over the valve stems and wheel condition. On heavy-duty models, also be sure the chosen tire's load capability matches the weight the truck will actually carry.

Tires are only one part of a longer-trip checklist, but they are the part in constant contact with the road. A truck that tows, hauls, or spends time on rough surfaces deserves an extra look at shoulder wear and impact damage before departure. If the truck has recently changed wheel packages or moved from one stock size family to another, recheck clearance and full-lock steering behavior before heading out.