2018 RAM Trucks Tire Fitment Guide

2018 RAM Trucks pickups use eight sizes across the 1500, 2500, and 3500: 265/70R17, 275/60R20, 285/70R17, 285/45R22, 275/70R18, 285/60R20, 245/70R17, and 235/80R17. The 1500 uses 265/70R17, 275/60R20, 285/70R17, and 285/45R22. The 2500 uses 275/70R18, 285/60R20, 285/70R17, and 245/70R17. The 3500 uses 275/70R18, 285/60R20, and 235/80R17. Rim diameters span 17, 18, 20, and 22 inches, and the supported rim-width ranges where products are available run from 6.0 inches to 9.5 inches depending on size.

That means year and make alone are not enough to choose a tire for a 2018 RAM Trucks pickup. A shared size such as 285/70R17 can apply across more than one model, while others are tied to a single truck line or wheel package. Before ordering, confirm the exact model, verify the wheel diameter already on the truck, and compare the sidewall marking on the current tire if it is still original to the vehicle's setup.

On a 2018 RAM Trucks pickup, 265/70R17 is a metric radial size. The 265 is the tire's nominal section width in millimeters, 70 is the aspect ratio, meaning the sidewall height is 70 percent of that width, R identifies radial construction, and 17 is the wheel diameter in inches. In current offerings for this size, the tire fits 17-inch wheels with a rim-width range of 7.0 to 9.0 inches and appears with an RWL sidewall.

Reading the code correctly helps prevent a common mistake: matching width but missing the wheel diameter or profile. On a 2018 RAM Trucks 1500, 265/70R17 is not interchangeable with a 20-inch or 22-inch fitment just because the truck is the same year and make. Always compare the full size code, not just the first number, and make sure the replacement tire matches the wheel already on the truck.

No. 2018 RAM Trucks models do not all use the same tire size. The 1500 has its own mix of 17-, 20-, and 22-inch fitments, the 2500 combines 17-, 18-, and 20-inch heavy-duty sizes, and the 3500 uses 17-, 18-, and 20-inch sizes with one fitment unique to that model. Two sizes are shared across models: 285/70R17 appears on some 1500 and 2500 trucks, while 275/70R18 and 285/60R20 are shared between certain 2500 and 3500 applications.

That variation matters because RAM used different wheel packages and load-focused tire choices across the lineup. A half-ton truck and a one-ton truck can both wear 17-inch tires, yet the actual size and load rating expectations may still be different. The safest approach is to identify the truck as a 1500, 2500, or 3500 first, then confirm the wheel diameter and complete size code before comparing brands or tread styles.

2018 RAM Trucks tire offerings here use two sidewall styles: raised white letters and raised black letters. The 265/70R17, 285/70R17, 275/70R18, and 245/70R17 appear with RWL sidewalls, while the 235/80R17 appears with an RBL sidewall. Sidewall appearance can change the truck's overall look even when the tire is otherwise similar in size and intended use.

For many RAM owners, sidewall style is part of getting the visual character right. Raised white letters often suit a more traditional all-terrain or sport-truck appearance, while black-letter styling can look more understated and work-oriented. If appearance matters as much as fitment, check the sidewall style before settling on a product so the tire matches the way you want the 2018 RAM Trucks pickup to present.

BFGoodrich covers the current 2018 RAM Trucks sizes that have product availability here. The 265/70R17, 285/70R17, 275/70R18, 245/70R17, and 235/80R17 are available in BFGoodrich All-Terrain T/A KO2 form, all with radial construction. That gives RAM owners a consistent all-terrain brand family across several light-duty and heavy-duty fitments.

Choosing within one brand family can simplify the decision if you want a similar look and tread character across multiple trucks or across replacement cycles. The more important step is still matching the exact size and load-focused application to the truck, especially on 2500 and 3500 models. Once that is settled, brand preference becomes a way to fine-tune appearance and intended use rather than solve the core fitment question.

The 2018 RAM Trucks 285/70R17 size comes in two BFGoodrich All-Terrain T/A KO2 versions with the same radial construction, the same 17-inch rim diameter, the same 7.5-to-9.5-inch rim-width range, and the same RWL sidewall style. Where they differ is in rating and capacity. One carries a 116Q rating with a 2,755-lb maximum load at 50 psi and weighs 50.3 pounds, while the other carries a 121/118R rating with a 3,195-lb maximum load at 80 psi and weighs 58.2 pounds.

That difference matters most for trucks that need heavier-duty capability from the tire itself. If a 2018 RAM Trucks owner is comparing these two 285/70R17 choices, the question is not wheel fitment but how much load reserve and inflation pressure the application calls for. Match the tire to the truck's use and axle demands, then confirm that the wheel and service requirements align with the higher-capacity or lighter-duty version.

Where rim-width guidance is available, 2018 RAM Trucks tire requirements vary by size. The 265/70R17 fits 7.0- to 9.0-inch rims, the 285/70R17 fits 7.5- to 9.5-inch rims, the 275/70R18 fits 7.0- to 9.0-inch rims, the 245/70R17 fits 6.5- to 8.0-inch rims, and the 235/80R17 fits 6.0- to 7.5-inch rims. Rim diameter still has to match exactly at 17 or 18 inches for those sizes.

Rim width affects how the tire sits on the wheel, which in turn influences tread shape, sidewall behavior, and overall appearance. Even when two tires share the same diameter, a wheel that suits one size may not be ideal for another. Before changing from one approved RAM size to another, verify both the wheel diameter and the wheel width so the tire falls within the manufacturer's approved range.

These 2018 RAM Trucks sizes are modern radial truck tires, and none of the available size markings here use a tube-type designation. The available products are treated as tubeless-style radial fitments rather than classic tube-type tires. That matches what most buyers would expect on a late-model RAM pickup using contemporary one-piece truck wheels.

Even so, the wheel itself still matters. If a wheel has been damaged, heavily corroded, or altered, sealing performance can suffer no matter what the tire was designed to use. When mounting replacement tires on a 2018 RAM Trucks pickup, inspect the bead seat condition and replace valve stems as part of the service so the complete assembly is ready for normal road use.

A stored 2018 RAM Trucks pickup should be kept out of direct sunlight and away from ozone sources such as electric motors, compressors, welders, and battery chargers. Clean, dry storage with stable temperatures helps preserve the sidewalls, and the truck should be moved periodically so the same part of each tire does not stay loaded for months at a time. Modern radials resist flat-spotting better than many older bias-ply designs, but they still benefit from proper support and inflation during long storage.

For seasonal or collector use, check pressure before the truck goes into storage and again before it returns to the road. If the truck will sit for a very long time, some owners use stands or reduce static load on the tires while keeping the suspension supported appropriately. A little storage planning goes a long way toward preventing cracking, irregular wear, and avoidable replacement costs later.

On a 2018 RAM Trucks pickup, tire age is usually a more important replacement guide than mileage alone, especially on trucks that are driven infrequently. A good rule is to begin evaluating tires closely once they are around five to seven years old and to consider replacement as they approach ten years, regardless of tread depth. The DOT date code on the sidewall is the quickest way to confirm the tire's actual age.

Usage pattern matters. A truck that tows, carries heavy loads, or spends time in heat and sun may age its tires faster than a lightly used collector truck kept indoors. Sidewall cracking, hardening, impact damage, and persistent air loss can all move replacement up sooner. If the truck still wears older tires with decent-looking tread, age should still be part of the decision before regular highway use.

Tires on a 2018 RAM Trucks pickup should be inspected before every drive and again before any longer trip. Check inflation pressure, tread wear, sidewall condition, cuts, bulges, punctures, and any signs of irregular wear that could point to alignment or suspension issues. On heavier-duty models, also pay attention to whether the tire appears to be carrying load evenly and whether any tire has started losing pressure between uses.

That routine is especially important on trucks that spend part of the year parked and then return to towing, hauling, or highway driving. A quick walk-around often catches problems early, including weather checking or damage from curbs and jobsite debris. If one tire looks different from the rest in wear or stance, have the full set examined before putting a 2018 RAM Trucks pickup back into regular service.

Yes, the available 2018 RAM Trucks tires are modern radial truck tires suited to normal highway use when they are in good condition, correctly inflated, and matched to the truck's service requirements. The speed ratings present here include Q at 99 mph, R at 106 mph, and S at 112 mph, depending on size and version. Those ceilings are well above typical U.S. highway speeds, so day-to-day safety usually depends more on correct load use, inflation, and overall vehicle condition than on top-speed capability.

The practical point is to match the tire's load and speed rating to how the truck is actually used. A 1500 used as an everyday pickup and a 3500 used for heavier work may need very different margins even if both are highway driven. Before a long trip, make sure the tire size, inflation level, and weight demands all align with the truck's real-world job rather than assuming any tire of the same diameter will do.

Inflation pressure for 2018 RAM Trucks tires depends on the exact size and product. The available examples include 265/70R17 at 2,470 lbs @ 50 psi or 3,195 lbs @ 80 psi depending on version, 285/70R17 at 2,755 lbs @ 50 psi or 3,195 lbs @ 80 psi, 275/70R18 at 3,640 lbs @ 80 psi, 245/70R17 at 3,000 lbs @ 80 psi, and 235/80R17 at 3,085 lbs @ 80 psi. Those figures are maximum load-at-pressure ratings for the tire itself, not a one-pressure-fits-all setting for every RAM application.

Use the truck's door placard or owner's manual as the starting point for factory pressure guidance, then make sure the tire's own rated limits are respected. Do not carry a pressure figure from one RAM size to another just because the trucks look similar. On 2500 and 3500 models especially, the correct pressure can change significantly with load, so pressure setting should match both the tire and the truck's intended duty.

Before a longer drive in a 2018 RAM Trucks pickup, inspect every tire for cracking, cuts, punctures, bulges, uneven wear, and proper cold inflation pressure. Check that the tires all match the intended axle fitment, inspect valve stems, and make sure the spare is present and usable. If the truck will be towing or carrying cargo, confirm that the tires' load capability and condition are appropriate for that extra demand.

Tires are only one part of a broader pre-trip check on a modern truck, but they are among the easiest items to verify and one of the most critical for stability and braking. On a truck that has spent time parked, even a short inspection can reveal air loss or sidewall aging before it becomes a roadside problem. A few minutes spent checking the tires can prevent a much larger interruption once the trip begins.