The 2026 Rivian Trucks R1S sits in the modern electric SUV space with a mix of luxury, utility, and serious road-trip capability, so tire fitment is tied closely to how the vehicle is configured. On this exact R1S, the key fitment question is not construction type, since both primary sizes are radial, but whether the vehicle uses 275/50R22 or 275/60R20. Those sizes correspond to different wheel diameters and appear across different R1S sub-model and package combinations. That makes wheel confirmation and exact sub-model identification the first step before comparing replacement choices, ride priorities, or road-versus-all-terrain intent.
Which Tire Size Is Right for The 2026 Rivian Trucks R1S
The 2026 Rivian Trucks R1S uses two primary tire sizes, and the right one depends on the exact sub-model and wheel setup. Both are radial tires, but they mount on different rim diameters, so confirming whether the vehicle has 20-inch or 22-inch wheels is the first step before choosing a replacement. Once that is settled, the real decision shifts to selecting the correct size for the vehicle’s configuration and intended use.
275/50R22 is a modern metric radial size that identifies a 275-millimeter nominal section width, a 50-series aspect ratio, radial construction, and a 22-inch rim diameter. On the 2026 Rivian Trucks R1S, this size is one of the primary fitments and is associated with 22-inch wheel setups. With an overall diameter close to 32.83 inches, it stays within the larger-diameter SUV tire range while using a shorter sidewall than the 20-inch option. This is the size to evaluate when the R1S is equipped with 22-inch wheels and the goal is to match that wheel diameter correctly.
Fit(s): Dual Standard, Dual w/All-Terrain Pkg., Quad, and Tri w/All-Terrain Pkg.
Construction: Radial|Rim: 20 in
275/60R20 is a modern metric radial size that combines a 275-millimeter nominal section width with a 60-series profile, radial construction, and a 20-inch rim diameter. On the 2026 Rivian Trucks R1S, it serves as the primary fitment for 20-inch wheel applications and appears on certain standard and all-terrain-oriented configurations. Its overall diameter is about 32.99 inches, so it remains very close in height to the 22-inch fitment while using a taller sidewall. This is the size to confirm when the vehicle has 20-inch wheels or an all-terrain package configuration.
Tire fitment on the 2026 Rivian Trucks R1S varies by sub-model and package, so identifying the exact configuration matters before choosing a replacement. Some versions use one size only, while others can be equipped with either 20-inch or 22-inch wheel-and-tire combinations.
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2026 Rivian Trucks R1S Dual
The 2026 Rivian Trucks R1S Dual uses the 275/50R22 radial size. That makes 22-inch wheel confirmation especially important before replacement, since moving to a different rim diameter would require a different primary tire size rather than a simple tire swap.
The 2026 Rivian Trucks R1S Dual Standard can use either 275/50R22 or 275/60R20, depending on the wheel setup. Tire selection starts with confirming whether the vehicle has 22-inch or 20-inch rims, since both sizes are primary fitments for this sub-model.
The 2026 Rivian Trucks R1S Dual w/All-Terrain Pkg. uses the 275/60R20 radial size. That points the buyer toward 20-inch wheel fitment first, with attention to maintaining the package-specific tire size rather than assuming the 22-inch alternative applies.
The 2026 Rivian Trucks R1S Quad can be fitted with either 275/50R22 or 275/60R20. For this sub-model, the practical first step is checking the actual wheel diameter on the vehicle, because both sizes are valid but not interchangeable without the matching rim.
The 2026 Rivian Trucks R1S Tri uses the 275/50R22 radial size. Tire selection is therefore centered on the 22-inch wheel setup, and replacement should begin by matching that size before comparing tread style, road use, and overall driving priorities.
The 2026 Rivian Trucks R1S Tri w/All-Terrain Pkg. uses the 275/60R20 radial size. That keeps the fitment focus on 20-inch wheels, so the main check is confirming that the vehicle still retains its package-appropriate wheel and tire configuration.
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.
Frequently Asked Questions
These FAQs focus on the exact tire sizes used on the 2026 Rivian Trucks R1S, how fitment changes by sub-model and wheel diameter, and what to verify before replacing tires on a modern electric SUV.
Tire Size & Fitment
What tire size fits a 2026 Rivian Trucks R1S?
The 2026 Rivian Trucks R1S uses two primary tire sizes: 275/50R22 and 275/60R20. Both are radial sizes, but they do not apply across every R1S the same way, because fitment changes by sub-model and package combination.
The most important step is confirming the exact R1S configuration and actual wheel diameter on the vehicle. A 22-inch wheel requires the 275/50R22 fitment, while a 20-inch wheel uses 275/60R20, so replacement should start with the sub-model and wheel setup rather than assuming every 2026 R1S uses one universal size.
What size rim does a 2026 Rivian Trucks R1S use?
A 2026 Rivian Trucks R1S uses either a 22-inch rim or a 20-inch rim, depending on the sub-model and package. The 275/50R22 tire mounts on a 22-inch wheel, while the 275/60R20 tire mounts on a 20-inch wheel.
That rim-diameter difference is the first fitment checkpoint because tire size and wheel diameter have to match exactly. Before choosing replacement tires, inspect the wheel itself and confirm whether the vehicle has its original wheel setup or a changed one, especially on R1S versions that could be equipped with either primary size.
Why does the 2026 Rivian Trucks R1S have more than one tire size?
The 2026 Rivian Trucks R1S has more than one tire size because different sub-models and package combinations use different wheel-and-tire setups. Some configurations use 275/50R22, some use 275/60R20, and a few sub-models can be equipped with either size depending on the wheels installed.
That means tire selection is tied to configuration, not just model name. An R1S owner should confirm the exact sub-model and check the actual wheel diameter on the vehicle before ordering replacements, since both sizes are correct in the lineup but each one belongs with its matching rim and intended setup.
Choosing the Right Tire
What should I consider when choosing a 275/50R22 tire for a 2026 Rivian Trucks R1S?
Choosing a 275/50R22 tire for a 2026 Rivian Trucks R1S starts with making sure the vehicle actually uses the 22-inch fitment. This size combines a 275-millimeter width with a 50-series profile, so the replacement should match the 22-inch wheel diameter and the intended use of the vehicle.
After size confirmation, compare the tire’s road-use focus, sidewall profile, and how closely it aligns with the R1S setup already on the vehicle. It also helps to inspect the wheels for any aftermarket changes, since wheel width or offset differences can affect how a same-size tire sits and clears the suspension and body.
What should I consider when choosing a 275/60R20 tire for a 2026 Rivian Trucks R1S?
A 275/60R20 tire is the correct starting point for 2026 Rivian Trucks R1S configurations that use 20-inch wheels. The size keeps the same nominal width as the 22-inch fitment but uses a taller sidewall, so the selection process begins with confirming that the vehicle is truly on the 20-inch setup.
Once the rim diameter is verified, compare tires according to how the R1S is driven and whether the vehicle retains its original package configuration. Clearance, wheel width, and any suspension or wheel changes should still be checked, because even the correct nominal size needs to suit the actual vehicle as it sits today.
How do I choose between the available tire sizes for a 2026 Rivian Trucks R1S?
The right way to choose between 275/50R22 and 275/60R20 on a 2026 Rivian Trucks R1S is to match the tire to the vehicle’s wheel diameter and sub-model configuration. These are both primary fitments in the R1S range, but they are tied to different wheels rather than being casual alternatives for the same rim.
A quick visual check of the wheel diameter is often enough to narrow the choice, especially if the vehicle still has its original setup. On sub-models that could use either size, confirming the wheel currently installed matters more than comparing the numbers on paper, because the correct tire starts with the correct rim.
Restoration & Appearance
Does correct tire fitment matter for a 2026 Rivian Trucks R1S restoration or appearance build?
Correct tire fitment still matters on a 2026 Rivian Trucks R1S, even though it is a modern vehicle rather than a vintage restoration subject. The visual balance of the vehicle depends heavily on whether it is using the proper 20-inch or 22-inch wheel-and-tire combination for its configuration.
Appearance-focused builds should begin by preserving the correct relationship between tire size and wheel diameter before making style changes elsewhere. If the R1S has been modified with different wheels, check clearance and overall stance carefully so the finished look remains intentional instead of appearing mismatched or undersized.
How does tire size affect the appearance of a 2026 Rivian Trucks R1S?
Tire size affects the appearance of a 2026 Rivian Trucks R1S because the two primary fitments pair the same nominal width with different wheel diameters and sidewall proportions. A 275/50R22 presents the tire on a larger wheel, while a 275/60R20 uses a taller sidewall on a smaller rim.
That difference changes the visual character of the vehicle even when overall tire height stays close. Anyone trying to keep an R1S looking consistent with its original package or intended style should verify the installed wheel diameter first, then choose the matching tire size instead of mixing the look across mismatched rims.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2026 Rivian Trucks R1S?
Yes, modifications can affect tire fitment on a 2026 Rivian Trucks R1S even when the tire size itself looks correct on paper. Wheel changes, offset changes, suspension adjustments, or body alterations can all influence clearance, steering travel, and how a 275/50R22 or 275/60R20 tire sits in the wheel opening.
That is why replacement should be matched to the vehicle as it currently exists, not only to the original sub-model specification. An R1S with aftermarket wheels or suspension changes should be checked for wheel diameter, width, and clearance at full steering lock and normal ride height before new tires go into service.
What should I inspect before driving a 2026 Rivian Trucks R1S on new tires?
Before driving a 2026 Rivian Trucks R1S on new tires, inspect the wheel diameter, confirm the tire size matches the wheels, and make sure the tires are mounted and inflated properly. It also helps to look over the wheels, valve stems, and visible suspension and brake components for anything unusual.
A short follow-up inspection after the first miles is also worthwhile. Check for rubbing, uneven seating, vibration, or signs that the tire is contacting a liner or suspension part, especially if the R1S has non-original wheels or has been switched between 20-inch and 22-inch setups at some point.
How often should tires on a 2026 Rivian Trucks R1S be inspected?
Tires on a 2026 Rivian Trucks R1S should be inspected regularly, not just when tread looks worn. A practical routine is to check pressure and visible condition often, then give the tires a closer inspection for cuts, punctures, irregular wear, and sidewall damage before longer trips or heavier use.
That routine matters even more on a vehicle with multiple possible wheel-and-tire setups, because mismatched wear can point to alignment, inflation, or fitment issues. An R1S that sits for periods between drives should also have its tires checked for air loss and age-related condition changes before returning to regular road use.
