RAM Truck Tire Size Guide
Factory tire sizes for every RAM 1500, 2500, and 3500 trim — Tradesman to Rebel to Power Wagon — plus upgrade rules for 33s, 35s, speedometer correction, and tow-safe fitment.
Which generation do you have?
DS/Classic (2009–2021 carryover) and DT (2019–present 5th gen) are different trucks with different clearances and bolt patterns.
Tradesman, Big Horn, Laramie?
Street trims use 17" or 18" wheels with P-metric or light LT tires. 20" and 22" are appearance upgrades with lower-profile rubber.
Rebel, Warlock, RHO?
These trims leave the factory close to or at 33" territory — so your upgrade headroom is smaller than you think.
Want 33s on a DT?
Many stock DT 1500s can fit true 33-inch tires with no modifications, especially on 18" wheels with close-to-stock offset.
Want 35s on a DT?
Usually requires a leveling kit or 2" lift — plus offset management, fender liner work, and speedometer recalibration.
Daily driver that tows?
Never replace RAM factory tires with a lower load index. The door placard specifies the minimum load rating for your payload class.
Before you buy RAM tires
Compare stock vs upgrade sizes with the calculator
Enter your RAM's stock size and your upgrade target — see exact diameter change, speedometer error, and circumference difference instantly.
On this page
RAM truck generations at a glance
Before looking up any RAM tire size, you need to know which generation you have. The RAM 1500 Classic (DS) and the current 5th-gen DT are sold side by side — and they are not the same truck. HD trucks are a completely separate family.
DS / 1500 Classic
2009–2021 (carried over)
Still sold as the 1500 Classic alongside the DT. Simpler architecture but many owners still run 33s with minimal work.
DT (5th Gen 1500)
2019–present
The coil rear actually tightens clearance compared to the leafspring DS. Rebel and Warlock already run larger OEM tires. Check which sub-model carefully.
RAM 2500 HD
2010–present
Power Wagon ships with LT285/70R17 as OEM. HD suspension architecture means far more upgrade headroom than 1500.
RAM 3500 HD
2010–present
SRW and DRW have completely different fitment rules. Load index is critical — never reduce below OEM on any tow-rated HD spec.
RAM 1500 and RAM 2500/3500 bolt patterns are completely different. The 1500 uses 5-lug; the HD trucks use 8-lug. Wheels, brakes, and spacers are not interchangeable between them.
RAM 1500 DT (5th gen, 2019–present) stock sizes by trim
The DT generation launched in 2019 with a coil rear suspension and a wider range of factory tire sizes than any previous RAM 1500. Stock diameter ranges from roughly 30.5" on base trims to a factory 35" on the RHO.
| Trim / Package | Wheel Size | OEM Tire Size | Approx. Diameter | Notes |
|---|---|---|---|---|
| Tradesman 2WD/4WD | 17" or 18" | P245/70R17 or P265/65R17 | ~30.5–31.6" | Work-truck base. P-metric construction standard. |
| Express | 20" | P275/55R20 or P275/60R20 | ~31.9–32.5" | Popular street appearance package. |
| Big Horn / Lone Star | 18" or 20" | P265/65R18 or P275/55R20 | ~31.6–31.9" | Most common everyday RAM size. |
| Laramie | 18", 20", or 22" | P275/65R18, P275/55R20, or P285/45R22 | ~31.9–32.5" (22" shorter sidewall) | Multi-wheel-size trim — verify before ordering. |
| Warlock | 18" | LT285/70R17 or P265/65R18 | ~31.6–32.7" | Off-road appearance package. Often runs taller OEM rubber. |
| Rebel | 18" | LT275/70R18 Goodyear DuraTrac | ~33.2" | Factory 33-inch territory. Very little room left without modifications. |
| RHO (replaced TRX) | 18" | 35" Goodyear Wrangler Territory | ~35" | Factory 35s. 540 HP inline-6 off-road performance package. Not a standard fitment reference. |
| Limited / Limited Longhorn | 20" or 22" | P275/55R20 or P285/45R22 | ~31.9" | Luxury trims; lower-profile rubber for road manners over off-road. |
| Tungsten | 22" | P285/45R22 | ~31.9" | Top-of-range comfort/luxury trim. Large wheel, short sidewall. |
Key insight for DT upgrades:The DT's coil rear suspension creates inner wheel-well geometry that can be tighter than the older DS leafspring platform for very wide tires. The radius rod position is the main inner clearance constraint — width matters as much as height on DT 1500 fitment.
RAM 1500 Classic (DS, 2009–2021) stock sizes
The Classic is the 4th-generation body sold alongside the DT. It retained the traditional leafspring rear, which gives it slightly different inner clearance behavior. It was discontinued in Canada after 2021 but continued in the US as a budget option.
| Trim | Wheel Size | OEM Tire Size | Approx. Diameter | Notes |
|---|---|---|---|---|
| Tradesman | 17" | P265/70R17 | ~30.6" | Standard work-truck fitment for the DS platform. |
| Express | 17" or 20" | P265/70R17 or P275/60R20 | ~30.6–32.4" | 20" appearance package common on the Express trim. |
| SLT | 17" or 20" | P265/70R17 or P275/60R20 | ~30.6–32.4" | Available in both wheel-size configurations. |
| Sport | 20" | P275/60R20 | ~32.4" | Street sport appearance; same diameter as most 20" DT trims. |
| Warlock | 18" | LT275/70R18 | ~33.2" | DS Warlock ran larger OEM tires, same as DT Rebel / Warlock. |
RAM 2500 stock tire sizes by trim
The RAM 2500's solid front axle and body-on-frame HD architecture means it starts with larger OEM tires and has considerably more upgrade headroom than the half-ton. Load index compliance matters most on these trucks.
| Trim / Package | OEM Tire Size | Approx. Diameter | Notes |
|---|---|---|---|
| Tradesman / base 17" | LT245/70R17 | ~30.5" | Entry HD; lighter LT construction. |
| Big Horn / Laramie 17" | LT285/70R17 | ~32.7" | Most common RAM 2500 everyday size. |
| Laramie / Rebel 18" | LT275/70R18 | ~33.2" | Premium mid-tier. Same diameter as RAM 1500 Rebel. |
| Laramie / Limited 20" | LT285/60R20 | ~33.5" | High-trim appearance; load range E standard. |
| Power Wagon | LT285/70R17 Goodyear Wrangler DuraTrac | ~32.7" | Iconic off-road HD trim. BIG upgrade headroom with the HD suspension. |
| Rebel (2500 HD) | LT285/70R17 | ~32.7" | Off-road appearance on HD chassis. |
RAM 3500 stock tire sizes (SRW and DRW)
The RAM 3500 is available in both single rear wheel (SRW) and dual rear wheel (DRW) configurations. DRW fitment rules are completely separate — the eight tire positions must all be matched by size and load index, and the bolt pattern is different again.
| Trim / Configuration | OEM Tire Size | Approx. Diameter | Notes |
|---|---|---|---|
| Tradesman SRW 17" | LT245/70R17 or LT285/70R17 | ~30.5–32.7" | Work-truck single rear wheel configuration. |
| Big Horn / Laramie SRW 18" | LT275/70R18 | ~33.2" | Mid-tier HD single rear wheel. |
| Laramie / Limited SRW 20" | LT285/60R20 | ~33.5" | Premium single rear wheel fitment. |
| Tradesman DRW 17" (front) | LT245/70R17 (front) / 245/70R17 x8 (rear) | ~30.5" | Dually front and rear fitments differ. Do NOT swap DRW tires casually. |
| DRW 20" premium | LT285/60R20 front / rear matched | ~33.5" | Match all eight positions — mixing load index on a DRW is unsafe. |
On RAM 3500 DRW trucks: all eight tires must be the same size, load rating, and construction. Mixing tires on a dually creates asymmetric load capacity and handling imbalance — this is a safety issue, not just a fitment preference.
Biggest tires without a lift — RAM edition
The DT 1500 is one of the better stock-height fitment platforms in the segment, partly because the Rebel and Warlock trims already run 33" OEM. But "what fits a Rebel" and "what fits a Big Horn" are not the same answer.
RAM 1500 DT — street trims (Tradesman, Big Horn, Laramie)
LT275/70R18 or 285/65R18 often fit well at close-to-stock offset. Wider tires (LT305 class) risk inner radius rod contact under compression.
Watch for: Fender liner contact at full lock under compression. Front mud flap vs tire corner. Radius rod / upper control arm clearance on 4WD models.
RAM 1500 DT — Rebel (factory 33")
The Rebel leaves the factory right at the limit. Width is the bigger issue — the Rebel can sometimes run 295/70R18 but rubs depend on exact offset.
Watch for: Rebel already has minimal clearance. Wider tire = inner contact before a taller tire causes trouble.
RAM 1500 DT — with 2" leveling kit
Bilstein 5100 or quality leveling spacers open up true 35" fitment. LT295/70R18 or 35×12.5R18 fit most DT trucks after leveling with minor liner work.
Watch for: Still need to verify offset — very low-offset aftermarket wheels + wide tires + leveling kit = cumulative interference risk.
RAM 1500 Classic DS
DS platform is leafspring rear and older coil front — slightly more predictable than DT for fitment. Can run LT275/70R18 or 285/65R18 without lift on many configurations.
Watch for: DS has less aggressive suspension geometry. Verify at full steering lock and compressed.
RAM 2500 HD
HD solid front axle architecture provides considerably more clearance headroom. Power Wagon specifically has been known to run 35×12.5 without modification.
Watch for: HD trucks still require load index matching. Going to a much heavier tire on a truck that tows heavily changes braking and gearing meaningfully.
Best practice: Check clearance at (1) straight-ahead static, (2) full left lock, (3) full right lock, and (4) both lock positions with the suspension fully compressed (load the truck or push down by hand). The static check is the least useful of the four.
RAM tire type by use case
The RAM 1500 serves a wider range of real-world roles than almost any other truck — luxury commuter, off-road rig, tow vehicle, and job-site hauler all in the same lineup. The right tire type is completely different for each role.
Daily driver / commuter
All-season P-metric or light LT highway
Quieter, lighter, better wet traction, better fuel economy. Factory or near-factory load index is fine for light use.
Popular picks: Continental TrailContact, Michelin LTX M/S2, BFGoodrich Trail-Terrain T/A
Light off-road / weekend trails
All-terrain LT load range D or E
Balance of road manners and off-road grip. Most real-world mixed-use RAM owners land here.
Popular picks: Goodyear Wrangler DuraTrac, BFGoodrich All-Terrain T/A KO3, Falken Wildpeak AT3W
Towing and payload work
LT load range E, high load index, HT tread
Load capacity under trailer tongue weight and axle load requires E-range minimum on heavy tow rigs. Highway tread keeps temperature low at highway speeds.
Popular picks: Michelin Defender LTX M/S, Continental CrossContact LX20, Cooper Discoverer HT3
Serious off-road / mud / overlanding
Mud-terrain or aggressive AT, LT load range E
Aggressive open tread for self-cleaning. Heavier sidewall for rock and debris resistance. Accept noise and MPG penalty.
Popular picks: BFGoodrich Mud-Terrain T/A KM3, Mickey Thompson Baja Boss, Nitto Ridge Grappler
RAM speedometer correction reference
Every tire diameter change shifts your speedometer. The taller the new tire, the faster you are actually going compared to what the dash reads. Use the truck tire calculator for your exact combination — the table below covers the most common RAM upgrade pairings.
| Stock Size | Upgrade Size | Diameter Change | Speedo Error | Odometer Impact |
|---|---|---|---|---|
| P275/55R20 (31.9") | LT275/70R18 (33.2") | +1.3" | ~4.1% fast | Reads ~4% less than true distance |
| P275/65R18 (32.1") | LT285/70R18 (33.7") | +1.6" | ~5.0% fast | Reads ~5% less than true distance |
| LT275/70R18 (33.2") | LT295/70R18 (34.3") | +1.1" | ~3.3% fast | Reads ~3.3% less than true distance |
| P275/65R18 (32.1") | 35×12.5R18LT (35.0") | +2.9" | ~9.0% fast | Significant — recalibration needed |
| LT285/70R17 (32.7") | LT315/70R17 (34.4") | +1.7" | ~5.2% fast | Reads ~5.2% less than true distance |
Speedometer reads fast = you are going faster than displayed. A 5% error at a displayed 60 mph means actual speed is ~63 mph. Use the truck tire calculator for your exact combination, and use the speedometer calculator to find corrected speeds at any reading.
Common RAM tire fitment mistakes
These are the mistakes RAM owners make most often — and most can be avoided with 5 minutes of research before ordering.
Using Rebel or TRX / RHO fitment as a baseline
These trims run dramatically larger tires than any other RAM 1500. Forums full of "33s fit no problem" comments often come from Rebel owners. On a Big Horn or Tradesman, the stock diameter is 2–3 inches smaller — your clearance math is completely different.
Confusing DT and DS fitment
The 5th-gen DT (2019+) and the 4th-gen Classic DS have different suspension geometries, different inner radius rod positions, and different front clearance envelopes. A fitment that works on a DS may not clear on the same-size DT.
Ignoring load index on a tow rig
RAM 2500 and 3500 owners especially: downgrading load index to fit a budget tire is not a compromise — it is a safety issue. The door placard specifies the minimum required load index for your truck's GVWR and payload class.
Going wide before going tall
On the DT 1500, inner clearance (radius rod, UCA, brake line) often fails before height clearance does. A 295/70R18 may rub inside before a 285/75R18 does. Width is often the binding constraint on DT trucks.
Skipping recalibration
RAM's UConnect system ties into speedometer, odometer, transmission shift points, and some ADAS features. A 3"+ diameter jump changes calibration meaningfully and should be corrected with a tuner or PCM recalibration.
Choosing 22-inch wheels for off-road builds
22" wheels are OEM on Laramie and Tungsten trim — they are appearance packages, not off-road geometry. Bigger wheels with low-profile tires have less sidewall flex, absorb impacts harder, and give you less room to air down off-road.
Before ordering RAM tires
Verify diameter change and speedometer impact
Enter your stock RAM size and your target — see exact diameter difference, speedometer error, and revs per mile in one step.
Tire sizes listed are consolidated from OEM specifications, manufacturer data, and fitment references. RAM can change wheel packages mid-year or by market, and configurations differ by cab, bed, drivetrain, and payload package. Your door-jamb placard is always the authoritative reference for your specific truck. TireCalculatorHub is not liable for fitment or safety issues resulting from information on this page.
Frequently asked questions
The tire questions RAM owners ask most — answered with the specificity that generic guides skip.