Rivian Tires: Why Your 7,000-Pound EV Ships on the Wrong Rubber (And What to Do About It)

The Weight Nobody Warned You About

You bought a Rivian. You love it. The torque is absurd. The gear tunnel is a party trick. The quad motors do things on trails that make Jeep owners look twice.

But here's something Rivian doesn't lead with: your truck weighs as much as an F-250. And it's riding on tires that were designed for something half that weight.

The R1T tips the scales at 6,870 to 7,148 lbs -- empty. No gear, no passengers, no rooftop tent. The R1S is right there with it at 6,671 to 6,920. Load them up for a trail day and you're pushing toward the GVWR of 8,532 lbs. That puts the Rivian in EPA weight class 2b -- the same bracket as Ford Super Dutys and Chevy 2500s.

Those trucks come from the factory on LT tires rated for the punishment. Your Rivian comes on Euro-metric Pirellis.

That's not necessarily a problem. But it's a problem you need to understand before you air down.

What's Actually on Your Rivian Right Now

Every Rivian that rolled off the Normal, Illinois line ships on Pirelli Scorpion tires. The exact model depends on your wheel size and generation.

Gen 1 (2022--2024)

Gen 2 (2025--2026)

Every single one of those tires carries the same two markings: ELECT (optimized for EVs) and RIV (made specifically for Rivian). And every single one is Euro-metric -- not P-metric, not LT.

Why "Euro-Metric" Matters

Look at your sidewall. The size reads 275/65R20 -- no letter prefix. No "P." No "LT." That makes it Euro-metric, governed by ETRTO (the European tire standards body) rather than the U.S. Tire & Rim Association.

This trips up a lot of Rivian owners. Forum posts routinely call the stock tires "P-metric." They're not. And the distinction matters for one specific reason that we'll get to in a minute: the FMVSS de-rating rule.

For a deeper breakdown of how P-metric, Euro-metric, and LT designations work, see the full SL vs LT tire guide.

Why 48 PSI Isn't Optional

Pop open your driver's door. The placard says 48 PSI front and rear. That might seem high if you're coming from a sedan that runs 32-35. But there's hard math behind that number.

The Load Math

The OEM Pirellis carry a Load Index of 116. That means each tire can support a maximum of 2,756 lbs at its rated pressure.

Sounds like plenty for a ~7,100 lb truck split across four tires. But it's not that simple.

Federal safety standards (FMVSS 110) require a de-rating calculation for passenger-type tires -- both P-metric and Euro-metric -- when they're installed on trucks, SUVs, and multi-purpose vehicles. You divide the tire's load capacity by 1.1. This is a regulatory safety buffer, and it applies to every Rivian on the road.

Now look at the rear axle, which carries the heaviest load:

• Rear GAWR (Gross Axle Weight Rating): 4,960 lbs
• Per rear tire: 4,960 / 2 = 2,480 lbs
• OEM tire max load (LI 116): 2,756 lbs
• After FMVSS de-rating (/ 1.1): 2,505 lbs
• Remaining margin: 2,505 - 2,480 = 25 lbs

Twenty-five pounds. Per tire. At full rated pressure.

That's the margin between meeting the federal safety standard and not. It's not dangerous -- the tire doesn't explode at 2,506 lbs. But it tells you exactly how tightly engineered this system is. There's no headroom to spare.

The front axle is less strained -- a GAWR of 4,134 lbs means 2,067 lbs per tire, comfortably within the de-rated capacity. The rear is where it gets tight.

What About Load Index 115?

In early 2022, some Rivians with 22" wheels shipped with Load Index 115 Pirellis. LI 115 = 2,679 lbs max. After de-rating: 2,679 / 1.1 = 2,435 lbs.

That's 45 lbs short of the rear axle requirement. It doesn't pass the federal standard.

Rivian corrected this to LI 116 across all wheel sizes. If you have an early-production 22" Rivian that's still on the original rubber, check the sidewall. If you see 115, you're due for new tires regardless of tread life.

Why the Max Sidewall PSI Looks So Close to 48

The OEM Pirellis have a maximum sidewall pressure of approximately 50-51 PSI. Rivian's 48 PSI sits just 2-3 PSI below the tire's absolute max. That's not an accident -- at this weight, the tires need to operate near their ceiling to carry the load safely.

The XL rating on these tires means they reach maximum load capacity at 41-42 PSI. The additional pressure up to 48 serves handling, contact patch optimization, and EV range efficiency. You're already at full load capacity at 42 -- the extra 6 PSI is for dynamics, not for carrying more weight.

Now Air Down. Here's What Happens.

This is why you're reading this article. You're at the trailhead. The door jamb says 48 on-road, and Rivian's off-road guidance suggests 31 PSI minimum for the 20" wheels. Let's run the math.

If you haven't read our breakdown of the TRA load-inflation formula, here's the short version: tire load capacity doesn't drop linearly with pressure. The Tire & Rim Association uses a power curve:

Load at target PSI = Max Load x (Target PSI / Max PSI) ^ 0.585

For XL tires, max load-rated PSI is ~42 PSI. Max load at LI 116 = 2,756 lbs.

At 31 PSI (Rivian's Off-Road Minimum for 20")

2,756 x (31 / 42) ^ 0.585 = 2,756 x 0.843 = 2,323 lbs per tire

After FMVSS de-rating: 2,323 / 1.1 = 2,112 lbs

Rear axle load per tire: 2,480 lbs.

You're 368 lbs per tire over the de-rated federal standard on the rear axle. Even without the de-rating, you're 157 lbs short of the full rear axle load.

In practice, this works because the de-rating is a regulatory minimum for tire selection, not a physical failure point. And the actual rear axle load at curb weight (no payload) is well below the GAWR. But the numbers show you how quickly the margins disappear as you add gear and drop pressure.

At 25 PSI (Common Trail Pressure)

2,756 x (25 / 42) ^ 0.585 = 2,756 x 0.757 = 2,086 lbs per tire

After de-rating: 2,086 / 1.1 = 1,896 lbs

Now think about it: your rear axle GAWR allows up to 2,480 lbs per tire. You've got 1,896 lbs of de-rated capacity. That's a 584 lb deficit per tire if you're anywhere near the weight rating.

Even without the de-rating, 2,086 lbs against a potential 2,480 lb load is thin. The math doesn't leave much room for a loaded gear vault, two passengers, and a cooler.

At 20 PSI (Aggressive -- Sand, Soft Terrain)

2,756 x (20 / 42) ^ 0.585 = 2,756 x 0.683 = 1,882 lbs per tire

At this pressure, you've lost 32% of the tire's load capacity. On a 7,100 lb truck with no cargo, each tire is carrying roughly 1,775 lbs (more on the heavier end). You've got maybe 100 lbs of margin -- on paper. In reality, weight distribution isn't even, and the rear carries more.

This is the zone where the OEM tires are asking you to be very, very careful. It's doable on light terrain at low vehicle weight. It's not where you want to be loaded up on rocky trails.

Why Your Wheel Size Changes Everything

Not all Rivian tires are created equal for off-road use. The wheel size determines your sidewall height, and sidewall height determines how much the tire can flex and absorb impacts when aired down.

That's a 30% difference in sidewall height between the 20" and 22" options. More sidewall means more air volume, more flex, more terrain conformity, and more cushion between the rim and whatever you're driving over.

The 20" wheels are the off-road choice. This isn't controversial -- Rivian themselves spec the AT tires on the 20" wheels. The 21" and 22" options trade sidewall for aesthetics and road manners. If you're buying a Rivian to take off-road, start with the 20" ATs or plan to switch.

The 22" tires with only 5.4 inches of sidewall have almost no room for flex. Airing down to 30 on a 22" tire gives you less terrain conformity than 35 on a 20" tire. You're working with fundamentally less material. For anything beyond light gravel, the 22s are the wrong tool.

How Rivian Compares to Other Heavy EVs

Here's the part that should make you think. Not all EV manufacturers solved the weight-vs-tire problem the same way.

See the pattern? The Hummer EV weighs 10,400 lbs and GM put LT E-rated tires on it. The Cybertruck weighs 8,669 lbs and Tesla went with LT D-rated. LT tires are exempt from the FMVSS 1.1 de-rating -- no capacity penalty on trucks and SUVs.

Rivian and Ford chose Euro-metric. Both sit right at the de-rating margin. Both have razor-thin load capacity headroom on the rear axle.

There's a reason for this choice. Euro-metric tires are lighter, quieter, and more efficient. The OEM Pirelli weighs roughly 39 lbs. A comparable LT E-rated tire weighs 54-65 lbs. That's potentially 60-104 lbs of additional unsprung, rotating mass across four tires -- which directly impacts EV range. Rivian optimized for the highway experience. It's a defensible engineering choice for a vehicle that most owners will never take off-road.

But if you do take it off-road -- and especially if you take it off-road regularly -- you're working within the tightest margins of any vehicle in this weight class.

The LT Upgrade: What You're Gaining (And What It Costs)

Swapping from the OEM Euro-metric Pirellis to LT-metric tires is the single most impactful off-road modification you can make to a Rivian. No lift kit, no skid plate, no auxiliary lighting changes the fundamental physics of what happens when you air down. Tires do.

The Options (LT275/65R20)

Every one of these E-rated LTs carries 3,750 lbs per tire at 80 PSI. No de-rating because they're LT-metric. Compare that to the OEM Pirelli's 2,756 lbs (2,505 after de-rating). That's roughly 50% more effective load capacity.

The Math at Trail Pressures

Let's run the same TRA formula on an E-rated LT at 25 PSI:

3,750 x (25 / 80) ^ 0.585 = 3,750 x 0.547 = 2,051 lbs per tire

No de-rating applies. The rear axle load per tire at GAWR is 2,480 lbs. You're still below the weight rating -- but at curb weight (~7,100 lbs), the actual rear tire load is closer to 1,900-2,000 lbs. That gives you real margin.

At 20 PSI on the same E-rated LT:

3,750 x (20 / 80) ^ 0.585 = 3,750 x 0.479 = 1,796 lbs per tire

Even at 20 PSI, an E-rated LT on a Rivian at curb weight has workable margins. And the sidewall construction -- 10-ply equivalent with thicker rubber -- physically resists pinch flats and maintains structural shape in ways the OEM Pirellis can't match at these pressures.

The Cost: Weight and Range

This is the honest part. LT tires are heavier. The OEM Pirelli weighs roughly 39 lbs. The LT options above range from 54-65 lbs. Across four tires, that's 60-104 lbs of extra rotating mass.

On an EV, rotating mass hits range harder than static weight. Real-world data from Rivian owners consistently shows a 7-10% range reduction after swapping to E-rated LTs. On a Rivian with ~300 miles of rated range, that's 20-30 miles lost per charge. On road trips with planned charging stops, that can mean the difference between making a charger comfortably and watching the battery percentage with white knuckles.

There are other costs too:

• Ride quality drops. E-rated sidewalls are stiff. The plush, quiet highway ride that Rivian engineered goes away. Road noise goes up. Small bumps transmit more directly.
• Acceleration response changes. Heavier tires mean more rotational inertia. The quad motors still have plenty of torque, but the instantaneous punch feels slightly muted.
• Price. LT tires in this size run $250-350 per tire. Plus mounting, balancing, and TPMS relearn. Budget $1,200-1,600 for a full swap.

The Gain

• 50% more load capacity (no de-rating)
• Physically stronger sidewalls (10-ply construction vs 2-ply equivalent)
• Confident airing down to 20-22 PSI on trails without doing margin math in your head
• Better puncture resistance from thicker sidewall rubber
• No FMVSS compliance anxiety -- LT tires are exempt from the 1.1 de-rating

For Rivian owners who do occasional easy dirt roads, the OEM tires work. For anyone doing regular trail work, the LT swap isn't just an upgrade -- it's the correct tool for the job.

A Note on the Toyo AT3 EV

Toyo makes an EV-specific version of their Open Country AT3 in the LT275/65R20 size. Same load specs as the standard AT3, but optimized for the characteristics that matter on EVs: reduced rolling resistance, lower noise at highway speeds, and a tread compound designed around the weight and torque profile of electric trucks.

At roughly 54 lbs, it's also the lightest option on the list alongside the standard AT3. If you're going LT on a Rivian and want to minimize the range penalty, this is the tire to watch.

Fair warning: Toyo makes four versions of the AT3 with nearly identical names -- two EV, two non-EV, each in LT and SL variants. They are not interchangeable, and tire shops mix them up regularly. Before you order, read the full Toyo AT3 comparison guide so you know exactly which one to ask for.

Your Highway PSI After Swapping to LT

If you swap to E-rated LTs, your door jamb pressure of 48 PSI is no longer the right number. That pressure was calibrated for the OEM Pirelli XL tires.

On an E-rated tire with a max load-rated PSI of 80, the starting-point formula is:

Starting PSI = (Vehicle Weight / 4 / Tire Max Load) x Max PSI

For a Rivian R1T at 7,100 lbs on E-rated tires (3,750 lbs max at 80 PSI):

7,100 / 4 = 1,775 lbs per tire

1,775 / 3,750 = 0.473

0.473 x 80 = ~38 PSI

That math says ~38 PSI. But here's where theory meets reality: most Rivian owners on E-rated LTs are running 50-60 PSI on the highway. Some run as high as 55-60. CJ (the author of this site) runs 285/65R20 Goodyear Duratracs RTs at 55 PSI.

Why the gap between the formula and what people actually run? A few reasons:

• Range. Higher pressure = lower rolling resistance = more miles per charge. On an EV where the LT swap already costs you range, running lower pressure compounds the penalty.
• Tire wear. E-rated tires at 38 PSI on a heavy EV can wear the shoulders faster than expected. Higher pressure keeps the contact patch more even under the Rivian's weight.
• The formula is a starting point, not gospel. It gives you the minimum pressure needed for load capacity. Where you actually land depends on your driving, your weight distribution, and how much range you're willing to trade.

The chalk test is still the best way to dial it in -- draw a line across the full tread width, drive 50 feet, check the wear pattern. Adjust 2-3 PSI at a time until the chalk wears evenly. But don't be surprised if you land well above 38. That's normal for heavy EVs on E-rated rubber.

The Practical Playbook

Here's how to think about tires for your Rivian, based on how you actually use it.

Scenario 1: Highway warrior. Occasional gravel road.

Keep the OEM Pirellis. Run 48 PSI on road. Drop to 35-38 on gravel. You're within a safe envelope and the OEM tires give you the best range and ride quality. No changes needed.

Scenario 2: Monthly trail days. Moderate terrain. Loaded with gear.

The OEM tires work, but you're living in the margins. Air down to 31 PSI minimum on 20" wheels (per Rivian's guidance). Don't go lower without understanding that your rear axle load capacity is compromised. Consider the LT swap if you find yourself wanting to go lower or if you carry significant payload.

Scenario 3: Regular off-road use. Rocky terrain. Recovery situations.

Swap to LT. Full stop. The load math on the OEM tires at trail pressures doesn't support aggressive airing down on a regular basis. E-rated LTs in 275/65R20 give you the capacity and sidewall strength to air down to 20-22 PSI with real margin. Accept the range trade-off.

Scenario 4: 21" or 22" wheels and you want to off-road.

First -- reconsider. The 20" AT wheels are the right choice for off-road. If switching wheels isn't on the table, stay on well-maintained dirt roads and don't plan on airing down significantly. The short sidewalls on 21" and 22" tires limit your options before the tire construction even enters the conversation.

Key Numbers to Remember

The Bottom Line

Rivian built an extraordinary vehicle and made a deliberate trade-off on tires. Euro-metric XLs optimize for range, comfort, and road noise -- which is exactly what 90% of Rivian owners need 100% of the time.

But if you're in the 10% who bought a Rivian partly because it can handle a trail -- and you plan to actually use that capability -- the stock tires are the weak link in the system. Not because they're bad tires. They're excellent highway tires on a vehicle that happens to be the same weight as a Super Duty.

The fix is straightforward: swap to LT 275/65R20 in E-rated, run the chalk test to find your new highway PSI, and accept 20-30 miles less range per charge. In exchange, you get a truck that can air down to the low 20s on real trails without the load capacity math keeping you up at night.

Check your sidewall. Run the numbers. Then decide based on how you actually drive -- not how the marketing materials say you should.

Air Down Smarter

Once you've got the right rubber -- OEM or LT -- the trailhead routine matters. A MORRflate AirHub lets you air down (and air back up) all four tires simultaneously to a matched pressure. No walking circles. No guessing which tire is at what PSI.

Pair it with a MORRflate TenSix compressor for airing back up, and your total trailhead time drops from 15-20 minutes to about three. On a Rivian going from 20 PSI back to 48, that time savings adds up fast.

For airing down basics and technique, start with the Airing Down 101 guide. For quick PSI targets by terrain, see the Rivian PSI reference.