The 2018 RAM Trucks 1500 sits in the final years of the fourth-generation half-ton lineup, a period when this truck blended daily comfort, towing utility, and trim-specific styling more than many buyers expected from a pickup. That variety matters when choosing tires, because this exact model uses four different primary radial sizes across its sub-model range: 265/70R17, 275/60R20, 285/70R17, and 285/45R22. The decision is less about vintage construction and more about matching the truck’s exact trim, wheel diameter, and intended use. Some setups lean toward practical all-terrain choices, while others reflect a more street-oriented wheel-and-tire package that should be verified carefully before replacement.
Which Tire Size Is Right for The 2018 RAM Trucks 1500
The 2018 RAM Trucks 1500 uses four primary tire sizes, and the right one depends on the exact sub-model and wheel diameter. These are all radial fitments, but they span 17-inch, 20-inch, and 22-inch rims, so confirming the truck’s current wheel size comes first. Once that is settled, the real comparison becomes load specification, sidewall presentation, and whether the tire suits a more all-terrain or street-focused setup.
Fit(s): Big Horn, Express, Harvest, Laramie, Lone Star, and Tradesman
Construction: Radial|Rim: 17 in
265/70R17 is a metric radial size where 265 identifies the nominal section width in millimeters, 70 is the aspect ratio, R denotes radial construction, and 17 is the rim diameter in inches. On the 2018 RAM Trucks 1500, this size is part of the truck’s 17-inch wheel fitment range and appears on several sub-models. Available choices in this size include BFGoodrich All-Terrain T/A KO2 tires with raised white letter sidewalls and differing load specifications. It is the size to evaluate when the truck is equipped with a 17-inch wheel and a more utility-oriented tire profile.
Fit(s): Big Horn, Express, Harvest, Laramie, Laramie Longhorn, Limited, Limited Tungsten Edition, Lone Star, and Sport
Construction: Radial|Rim: 20 in
275/60R20 is a metric radial size with a 275-millimeter nominal section width, a 60-series aspect ratio, radial construction, and a 20-inch rim diameter. On the 2018 RAM Trucks 1500, this size serves many sub-models and reflects a larger-wheel factory-style setup than the 17-inch fitments. Its role in the lineup makes it especially important to confirm the exact trim and wheel package before replacement, since not every 1500 uses the same diameter. Buyers looking at this size should focus first on matching the truck’s existing 20-inch wheel configuration and intended road use.
285/70R17 is a metric radial size that uses a 285-millimeter nominal section width, a 70-series profile, radial construction, and a 17-inch rim. On the 2018 RAM Trucks 1500, this size is associated with a distinct sub-model fitment rather than the broader 17-inch group. Available products include BFGoodrich All-Terrain T/A KO2 options with raised white letter sidewalls and different load ratings, giving the buyer a meaningful choice within the same overall size. This size should be considered only after confirming that the truck uses the wider 285-section 17-inch setup rather than the narrower 265/70R17 arrangement.
285/45R22 is a metric radial size in which 285 gives the nominal section width in millimeters, 45 identifies the lower-profile aspect ratio, R marks radial construction, and 22 is the wheel diameter. On the 2018 RAM Trucks 1500, this size belongs to a specialized 22-inch fitment and is not interchangeable in practice with the 17-inch or 20-inch setups simply because the truck model name is the same. Its lower-profile, large-diameter format makes wheel confirmation especially important. Buyers considering replacement here should verify the existing 22-inch package and check clearance carefully if the truck has been modified.
Tire fitment for the 2018 RAM Trucks 1500 varies by sub-model, and some trims were offered with more than one wheel-and-tire package. Checking the exact sub-model matters because this truck spans three rim diameters and four primary tire sizes.
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2018 RAM Trucks 1500 Big Horn
The 2018 RAM Trucks 1500 Big Horn uses either a 17-inch or 20-inch radial tire setup, so the wheel package has to be confirmed before choosing a replacement. That makes size selection a matter of matching the truck’s actual wheel diameter first, then comparing the appropriate tire options within that size.
The 2018 RAM Trucks 1500 Express also appears with either a 17-inch or 20-inch radial fitment rather than one universal tire size. Replacement starts with confirming which wheel package is on the truck today, especially if wheels have ever been changed.
The 2018 RAM Trucks 1500 Harvest uses one of two radial tire sizes depending on its wheel setup, so trim identification alone is not always enough. A quick check of the current wheel diameter will narrow the choice immediately and prevent selecting the wrong rim size.
The 2018 RAM Trucks 1500 Laramie can use either a 17-inch or 20-inch radial tire configuration. Tire selection therefore depends on confirming the actual wheels on the truck and then choosing a tire that matches the intended use and specification within that size.
The 2018 RAM Trucks 1500 Laramie Longhorn uses a 20-inch radial tire fitment. That keeps the size decision straightforward, with the focus shifting to selecting the right replacement characteristics for the existing wheel package.
The 2018 RAM Trucks 1500 Limited uses a 20-inch radial tire size rather than the 17-inch or 22-inch fitments seen elsewhere in the lineup. For replacement, the main task is staying with the proper 20-inch sizing and verifying that the current wheel setup has not been altered.
The 2018 RAM Trucks 1500 Limited Tungsten Edition uses a 20-inch radial tire setup. That makes fitment more focused than some other trims, though wheel changes or aftermarket packages should still be checked before choosing a tire.
The 2018 RAM Trucks 1500 Lone Star appears with either a 17-inch or 20-inch radial tire package. The important step is confirming which wheel diameter is actually on the truck, because both fitments exist under the same sub-model name.
The 2018 RAM Trucks 1500 Rebel uses the wider 285/70R17 radial fitment rather than the 265/70R17 size found on other 17-inch trucks. That distinction matters because tire width, rim-width range, and overall stance can differ even when rim diameter is the same.
The 2018 RAM Trucks 1500 Sport uses a 20-inch radial tire setup. Replacement is more straightforward here, with the buyer mainly comparing the right tire characteristics for the truck’s existing 20-inch wheel package.
The 2018 RAM Trucks 1500 Sport Reg. Cab uses the 285/45R22 radial size, making it the distinct 22-inch fitment in this lineup. That makes wheel diameter confirmation essential, especially because this size is visually and dimensionally different from the other RAM 1500 tire packages.
The 2018 RAM Trucks 1500 Tradesman uses the 265/70R17 radial size. Tire selection here is more direct, with attention centered on matching the 17-inch wheel setup and choosing a tire spec appropriate for how the truck is used.
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 2018 RAM Trucks 1500 Tires for Sale
Available products for the 2018 RAM Trucks 1500 are concentrated in the 17-inch sizes, with BFGoodrich All-Terrain T/A KO2 options in 265/70R17 and 285/70R17. These tires share radial construction and raised white letter sidewalls, while load capacity, weight, and rim-width compatibility vary by specification.
These FAQs focus on the tire sizes used across the 2018 RAM Trucks 1500 lineup, including wheel diameter, trim-specific fitment, product selection, and the checks that matter before regular road use.
Tire Size & Fitment
What tire size fits a 2018 RAM Trucks 1500?
The 2018 RAM Trucks 1500 uses four primary tire sizes: 265/70R17, 275/60R20, 285/70R17, and 285/45R22. All of them are radial sizes, but they do not apply across the lineup in the same way because different sub-models use different wheel-and-tire packages.
The first step is identifying the exact sub-model and confirming the truck’s current wheel diameter. A 17-inch, 20-inch, or 22-inch setup changes the correct tire size immediately, and aftermarket wheel changes can complicate the picture further. Matching the truck’s existing size and wheel package is more important here than assuming every 2018 RAM 1500 uses the same tire.
What size rim does a 2018 RAM Trucks 1500 use?
A 2018 RAM Trucks 1500 can use 17-inch, 20-inch, or 22-inch rims, depending on the sub-model and tire package. The tire sizes tied to those wheel diameters are 265/70R17 and 285/70R17 for 17-inch rims, 275/60R20 for 20-inch rims, and 285/45R22 for 22-inch rims.
Rim diameter should be confirmed before anything else because a tire for one wheel size cannot be mounted on a different rim diameter. It also helps to verify wheel width when comparing available products, since some tire specifications call for a narrower or wider approved rim range within the same basic tire size.
Why does the 2018 RAM Trucks 1500 have more than one tire size?
The 2018 RAM Trucks 1500 covers a wide trim range, and that leads to different wheel-and-tire packages across the lineup. Some sub-models use 17-inch tires, many use a 20-inch package, the Rebel uses a wider 17-inch size, and the Sport Reg. Cab carries a 22-inch fitment.
That means tire choice depends on the exact truck rather than the model name alone. Two RAM 1500s from the same year can look similar but use different rim diameters and section widths. Confirming the sub-model, reading the existing sidewall, and checking the actual wheel size will prevent ordering a tire that belongs to a different trim package.
Choosing the Right Tire
What should I consider when choosing a 265/70R17 tire for a 2018 RAM Trucks 1500?
Start by confirming that the truck actually uses 265/70R17, since the 2018 RAM Trucks 1500 was also offered with 20-inch and 22-inch fitments. In the available 265/70R17 choices, BFGoodrich All-Terrain T/A KO2 tires share the same basic size and raised white letter sidewall style, but they differ in load specification, weight, and approved rim-width range.
That makes intended use an important part of the decision. A truck used more heavily may call for closer attention to load capacity, while a truck focused on general road duty may lead the buyer to prioritize matching the existing wheel setup and tire spec. Keeping size, rim compatibility, and use expectations aligned is more useful than comparing by size name alone.
What sidewall styles are available for 2018 RAM Trucks 1500 tires?
Among the available products for the 2018 RAM Trucks 1500, the sidewall style shown is RWL, or raised white letter. That sidewall treatment appears on the BFGoodrich All-Terrain T/A KO2 options available in both 265/70R17 and 285/70R17.
Sidewall appearance can affect the truck’s overall presentation, especially on a pickup that may lean either more utility-oriented or more style-driven depending on the trim. Even so, sidewall style should come after the basics: correct size, proper rim diameter, and the right load specification for how the truck is actually used. Appearance matters, but fitment still leads the decision.
What brands offer tires for the 2018 RAM Trucks 1500?
The available products shown for the 2018 RAM Trucks 1500 are from BFGoodrich. Those products are concentrated in the 17-inch sizes, specifically 265/70R17 and 285/70R17, and they appear in the All-Terrain T/A KO2 series with radial construction and raised white letter sidewalls.
Brand is only one part of the selection process. It still helps to compare the exact tire specification within the correct size, including load capacity, weight, and approved rim-width range where that matters. On this truck, getting the sub-model and wheel diameter right remains the first step, since the lineup includes several distinct tire sizes.
Restoration & Appearance
How does tire construction affect the appearance of a restored 2018 RAM Trucks 1500?
All primary tire fitments for the 2018 RAM Trucks 1500 are radial, so the appearance decision is less about bias-ply versus radial and more about the wheel-and-tire package itself. A 17-inch all-terrain setup gives the truck a different visual character than a 20-inch street-oriented package or the 22-inch Sport Reg. Cab fitment.
For a restoration-oriented or collector-minded truck, matching the proper size and wheel diameter preserves the right overall stance better than chasing a generic replacement. Sidewall treatment also changes the look, and raised white letters create a more assertive presentation. Exact originality questions are best checked against trim-specific references and surviving vehicle examples.
Does correct tire fitment matter for a 2018 RAM Trucks 1500 restoration?
Correct tire fitment matters because the 2018 RAM Trucks 1500 was offered with several distinct wheel-and-tire combinations depending on the sub-model. Using the wrong rim diameter or an incorrect tire size can change the truck’s stance, visual balance, and the way the wheel package fills the wheel opening.
For a restoration-oriented project, the best starting point is confirming the exact sub-model and whether the truck still carries its original wheel size. After that, compare tire dimensions and available product specifications carefully. Even on a newer collector-era pickup, proper fitment supports both appearance and drivability far better than a one-size-fits-all replacement approach.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2018 RAM Trucks 1500?
Yes, modifications can affect tire fitment on a 2018 RAM Trucks 1500. Wheel changes, suspension lifts, lowering kits, offset changes, and body modifications can all alter the space available for the tire, even when the truck started with one of the factory-size combinations such as 265/70R17 or 275/60R20.
That matters because tire size alone does not tell the whole fitment story once the truck has been altered. A replacement should be checked against the actual wheel diameter and width, plus steering and fender clearance through the full range of motion. On a modified truck, the current setup matters more than the original trim designation.
What should I inspect before driving a 2018 RAM Trucks 1500 on new tires?
Before regular road use, inspect tire pressure, bead seating, tread and sidewall condition, wheel fastener torque, and any signs of rubbing or uneven clearance. It also helps to confirm that all four tires match the intended size and specification for the truck’s wheel package, especially on a model with multiple possible fitments.
A short test drive should include listening for contact during turns and checking how the truck settles under normal braking and steering. After that, recheck pressure and look again for any marks inside the wheel opening. On a RAM 1500 with changed wheels or suspension parts, this follow-up step is especially worthwhile.
How often should tires on a 2018 RAM Trucks 1500 be inspected?
Tires on a 2018 RAM Trucks 1500 should be inspected regularly, not just when tread wear becomes obvious. Routine checks should include pressure, tread depth, visible cracking, cuts, bulges, punctures, and signs of uneven wear that may point to alignment or suspension issues.
Trucks that sit for long periods still deserve inspection because low-use vehicles can develop age-related issues even with modest mileage. It is smart to check the tires before longer trips, after seasonal storage, and anytime the truck begins to steer differently or show vibration. Consistent inspection is one of the easiest ways to catch fitment or condition problems early.
