Ram 1500 Tire Size Chart by Year and Trim (2009 to 2026)

Ram 1500 factory tire sizes range from 265/70R17 on a base 4th gen Tradesman up to 325/65R18 on the 6.2L supercharged TRX, and the size depends far more on trim and wheel package than on model year alone. Two trucks built the same year can leave the factory on completely different tires.

Before you buy a replacement set or plan an upsize, you need to know your generation, your trim, and which wheel package your specific truck shipped with. The chart below breaks that down across all three Ram 1500 generations, from the 2009 4th gen (DS) through the current DT platform and the 2025 to 2026 RHO.

Ram 1500 Tire Size Chart by Year and Trim (2009 to 2026)

The table below covers factory fitment across every Ram 1500 generation. Sizes reflect the standard wheel package for each trim; option packages within a trim (an 18 inch versus a 20 inch wheel group) can shift the size, which is why the door placard always overrides a chart.

A note on the 2009 to 2010 model years specifically: several aggregator sources roll these into the same fitment as 2011, and Ram did not publish a separate tire size revision for those two years. If your truck is a 2009 or 2010 and the door placard shows something outside this range, trust the placard. It is the only source built from your exact build sheet.

Every 4th gen Ram 1500, including the 2019 to 2024 Classic, uses a 5×139.7mm (5×5.5 inch) bolt pattern with a 77.8mm hub bore, torqued to 130 lb-ft. Lug stud thread changed mid-generation: 2009 to 2011 trucks use 9/16 inch-18 studs, while 2012 and later trucks use M14x1.5. The 5th gen DT switched to a 6-lug 6×139.7mm pattern, so 4th gen wheels will not bolt onto a 2019 or newer truck unless it is a Classic model.

If you drive a 2014 specifically, our dedicated 2014 Ram 1500 tire size guide has the full trim breakdown for that model year.

How to Find Your Exact Ram 1500 Tire Size on the Door Placard

The chart above tells you what’s typical for your generation and trim. Your build sheet decides the final answer.

1. Open the driver’s door and look at the placard on the door jamb, not the door itself.
2. Find the line labeled “Tire Size.” It reads as a size code such as 275/60R20, formatted the same way as the sidewall of your current tires.
3. Check for a second line under “Spare.” Ram 1500 spares are frequently a smaller size or a different construction than the road tires, and swapping the spare onto the road wheels is not always a safe substitute.
4. If your truck has two option lines listed for wheel packages, match the one that corresponds to the wheels currently on the truck, not the one you assume came standard.

The placard reflects your actual build, including any mid-year running changes or regional trim variations that generic charts can’t capture.

Max No-Lift Tire Size by Trim for the Ram 1500

Street trims (Tradesman, Big Horn, Laramie) sit at roughly 31 to 32.4 inches of stock diameter and top out around 33 to 33.5 inches with the correct offset and no suspension changes. On the 4th gen DS platform, 285/50R20 and 33×12.5R18 are the two size and wheel combinations most commonly reported as clearing without a lift. On the 5th gen DT platform, LT275/70R18 or 285/65R18 tend to fit at close to stock offset, while wider LT305 class tires risk contact with the inner radius rod under compression.

Rebel, Warlock, and TRX trims already leave the factory closer to their clearance ceiling. The Rebel’s factory 275/70R18 or 285/70R17 puts it near 33 inches from the factory, so the room to size up before hitting fender liner or upper control arm contact is smaller than it looks. TRX and RHO trims run their factory 325/65R18 or 35×12.5R18 at the edge of their widened fenders already, and going wider without addressing offset invites rubbing at full steering lock.

Generation matters as much as trim here. The 4th gen DS and 5th gen DT have different front suspension geometry and different inner clearance envelopes, so a tire size that clears on one platform is not guaranteed to clear on the other, even at the same nominal diameter. If you’re planning an upsize rather than a like-for-like replacement, our best all-terrain tires for the Ram 1500 guide covers sizes that fit within these no-lift ranges.

Speedometer and TPMS Changes After a Ram 1500 Tire Size Change

Sizing up isn’t only a fitment question. It changes what your dashboard reports.

Speedometer error scales with the diameter change. Owners on Ram forums have reported that going from a 275/70R18 to a 295/70R18, a modest jump, reads roughly 2 mph slow at an indicated 60 mph. Larger jumps, such as factory tires to 35 inch tires, produce a bigger gap, commonly in the 5 to 10 percent range depending on the exact sizes involved.

Recalibrating the speedometer on newer trucks isn’t always straightforward. Multiple owners on RamForumZ have described dealers telling them that Stellantis restricts PCM reprogramming for tire sizes beyond stock, with one thread attributing the restriction to a post-2014 liability policy tied to a prior tire recall lawsuit.

That account comes from an owner’s description of a dealer conversation, not a published Stellantis policy document, so treat it as a reported experience rather than confirmed manufacturer policy. In practice, owners have used tools like a Hypertech speedometer calibrator, AlfaOBD, or an AEV ProCal module to correct the speedometer themselves when the dealer declines or can’t get a calibration to take.

TPMS doesn’t track tire diameter, so changing sizes alone won’t trigger a warning. What can trigger one is a pressure change: bigger, heavier-duty tires often run different recommended pressures than stock, and if the new pressure falls outside the TPMS threshold programmed for your truck, you’ll get a dash warning even though nothing is actually wrong. If you’re already dealing with a TPMS light after a tire swap, see our guide on what happens to your TPMS sensor after a tire change for the exact threshold behavior and reset steps.

Frequently Asked Questions

What size tires come stock on a Ram 1500?

Stock tire size depends on trim and generation. Base trims like Tradesman and ST run 265/70R17, mid trims like Big Horn and Laramie typically run 275/60R20 (4th gen) or 275/65R18 (5th gen), and off-road trims like Rebel run 275/70R18 to 285/70R17.

Does Ram 1500 tire size change by trim, not just year?

Yes. Within the same model year, a Tradesman, a Laramie, and a Rebel can all leave the factory on different tire sizes because of different wheel packages and suspension setups, not because Ram changed the size that year.

Can I put 33 inch tires on a Ram 1500 without a lift?

On most street trims, yes, within roughly 33 to 33.5 inches with the correct offset. Rebel and TRX trims are already close to that ceiling from the factory, so their headroom for a further upsize is smaller.

Do I need to recalibrate my speedometer after changing tire size on a Ram 1500?

If the new tire’s diameter differs noticeably from stock, yes. Owners have reported the dealer’s ability to recalibrate newer trucks is sometimes limited, which is why tools like AlfaOBD or a Hypertech calibrator are common workarounds.

Where do I find my exact factory tire size on my Ram 1500?

Check the placard on the driver’s door jamb. It lists the exact size for your specific build, including which wheel package your truck has, and it overrides any general year or trim chart.