Ram 1500 tire size

18-inch Big Horn, 20-inch Laramie, Rebel and 22-inch Limited.

Recommended Tire Care & Emergency Gear

Protect your tire investment, prevent uneven tread wear, and stay prepared for highway roadside emergencies.

Driver Equipment
Roadside Power Roadside Must

NOCO Boost Plus GB40 1000A 12V Lithium Jump Starter

Ultra-compact 1000-amp lithium jump starter rated for gasoline engines up to 6 liters and diesels up to 3 liters. Delivers up to 20 jump starts per charge with spark-proof technology and reverse polarity safety protection.

Revives dead vehicle batteries instantly without needing a second jump car
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Emergency Air Pro Compressor

Heavy-Duty 12V Metal Cylinder Portable Tire Inflator

High-output direct battery clamp air compressor delivering up to 120 PSI. Inflates standard passenger tires and oversized SUV/truck tires (up to 33 inches) in minutes with thermal overload cutoff protection.

Eliminates roadside strandings and avoids coin-operated gas station air pumps
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Wheel Service Torque Spec

LEXIVON 1/2-Inch Drive Click Torque Wrench (10-150 ft-lb)

Pre-calibrated reversible click-stop torque wrench with electro-black finish and dual-range highlighted scale. Ensures wheel lug nuts are tightened to exact manufacturer torque specifications.

Prevents warped brake rotors, broken wheel studs, and loose lug nuts
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Pressure Calibration Driver Essential

AstroAI Heavy-Duty Digital Tire Inflator Gauge (250 PSI)

Commercial pistol-grip inflator gauge with backlit LCD, heavy-duty brass air chuck, and quick-disconnect bleeder valve. Delivers precise 0.1 PSI resolution for exact cold-pressure balancing.

Maximizes tire contact patch, fuel efficiency, and tread longevity
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Puncture Repair Flat Defense

Boulder Tools Heavy-Duty All-Metal Tire Plug Repair Kit

Heavy solid steel T-handle spiral reamer and split-eye insertion needle with self-vulcanizing rubber repair strings. Plugs nail punctures and screw holes in steel-belted radial tires without demounting wheels.

Permanently seals tread punctures on the shoulder in under 10 minutes
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Safety Inspection Wear Inspector

Digital Tire Tread Depth Gauge with Backlit LCD Screen

High-precision hardened probe gauge measuring remaining rubber depth in 32nds of an inch and millimeters. Features one-touch zero tare to detect early suspension camber wear.

Alerts you before tread wears past the critical 4/32" wet hydroplane threshold
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Tire Maintenance & Wheel Service Matrix

Standard vehicle maintenance intervals to maximize tread lifespan, fuel economy, and highway braking stability.

Service Task Recommended Equipment Service Interval Vehicle Safety & Handling Impact
Cold Pressure Calibration Digital Inflator Gauge (0.1 PSI resolution) Monthly or before highway road trips Maintains uniform footprint, avoids edge-shoulder wear, and saves fuel.
Lug Nut Torque Verification 1/2-Inch Drive Click Torque Wrench Every tire rotation or 50 miles after wheel installation Eliminates wheel wobble, sheared wheel studs, and warped brake discs.
Tread Depth Inspection Digital Tread Depth Gauge Every 3,000 miles across all 4 tires Catches toe or camber alignment issues before tires fail wet braking tests.
Roadside Puncture Sealing T-Handle Vulcanizing Plug Kit On-demand when encountering road debris Seals nail punctures in the tread crown without waiting for roadside tow trucks.
Mobile Air Delivery 12V Battery-Clamp Air Compressor Pre-trip safety and roadside emergency inflation Re-inflates low tires after slow bead leaks or temperature drops.
Emergency Powertrain Start 1000A Lithium Jump Pack Vehicle emergency glovebox standby Provides standalone cranking amps during cold morning battery drains.
Mechanic Tip
Cold Inflation Calibration Rule: Tire pressure drops roughly 1 PSI for every 10 degrees Fahrenheit drop in ambient temperature. Furthermore, driving even 1 mile generates internal friction that raises tire pressure by 3 to 5 PSI above true ambient resting level. Never set your tire pressure to the "Max PSI" molded on the tire sidewall, which indicates the maximum mechanical burst rating of the casing. Always calibrate tire pressure when the vehicle has rested for at least 3 hours, matching the cold PSI specified on the yellow-and-white driver-side door jamb placard.

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Ram 1500 tire size on the current DT truck is a 275-section family until you get to the 22-inch Limited. Tradesman and Big Horn often wear 275/65R18. Laramie and many Limited 20-inch trucks wear 275/55R20. Rebel wears 275/70R18. The 22-inch Limited wears 285/45R22. TRX is a different truck (325/65R18) and is not this table.

Stock sizes by trim

These are the common North American DT (2019+) packages. Classic (4th-gen) Rams used 265/70R17 and 275/60R20 in a lot of years. If the title on the registration says Classic, this table is the wrong generation.

Ram 1500 OEM tire sizes. Overall diameter is calculated from the stamp.
Trim / packageStock sizeWheel (in)Diameter (in)
Ram 1500 Tradesman / Big Horn 18-inch275/65R181832.1″
Ram 1500 Laramie / Limited 20-inch275/55R202031.9″
Ram 1500 Rebel275/70R181833.2″
Ram 1500 Limited 22-inch285/45R222232.1″

Why the sticker beats the chart

Ram puts the same 275 width on three aspect ratios and three rims. That is why "just order 275s for a Ram" still fails. Aspect ratio and rim have to match the wheel you have.

This is not a fitment database

A Ram 1500 can leave the factory on more than one size. Export markets, mid-year packages and previous-owner plus-sizes all disagree with a chart. Read the driver-door placard. Match width, aspect ratio and rim together.

Swapping to a different size

275/65R18 is about 32.1 inches. 275/55R20 is about 31.9. 275/70R18 is about 33.2. 285/45R22 is about 32.1. Rebel is the one that already sits in the 33 band. Stepping a Big Horn to a 275/65R20 (34.1) is the same argument as the F-150 20-inch trucks. See 275/65R20 vs 275/60R20 for the height math, then check the well.

Rebel is the factory 33

275/70R18 at 33.2 inches is why Rebel owners have a shorter conversation about "going to 33s" and a longer one about 35s. Load range still matters. An LT all-terrain at the same stamp is a different tire than the highway 275 the Big Horn started on.

Frequently asked questions

What is the most common Ram 1500 tire size?

275/65R18 on many 18-inch trucks, 275/55R20 on many 20-inch Laramie and Limited trucks.

What size tires does a Ram Rebel use?

275/70R18, about 33.2 inches.

Is TRX the same as 1500?

TRX is a 1500-series truck on 325/65R18. Do not order Rebel tires for it.