The 2025 Rivian Trucks R1S brings modern electric SUV capability into a segment where wheel and tire choice has a real effect on how the vehicle looks and how it is used. Its combination of three-row utility, substantial curb weight, and adventure-oriented positioning makes exact tire sizing more than a cosmetic detail. For this R1S, the primary fitments are radial tires in three sizes: 275/50R22, 275/60R20, and 275/65R20. That means the first decision is confirming which wheel and tire package is on the vehicle, then comparing available options within that size. For owners planning everyday road use or light off-pavement travel, wheel diameter, profile, and intended use all matter.
Which Tire Size Is Right for The 2025 Rivian Trucks R1S
The 2025 Rivian Trucks R1S uses three primary tire sizes, and the correct choice depends first on confirming the wheel diameter already on the vehicle. Two sizes fit 20-inch wheels, while one fits a 22-inch wheel, and both R1S sub-models share those same fitment paths. The real decision is matching the vehicle's current setup and intended use rather than treating all three sizes as interchangeable.
275/50R22 is a metric radial size in which 275 is the section width in millimeters, 50 is the aspect ratio, R identifies radial construction, and 22 is the wheel diameter in inches. On the 2025 Rivian Trucks R1S, this size represents the 22-inch fitment path and should be matched to an actual 22-inch wheel setup. Its lower-profile format gives this R1S fitment a distinct role compared with the 20-inch sizes. Choosing it starts with wheel confirmation and then comparing tire dimensions, load suitability, and clearance against the vehicle's current configuration.
275/60R20 is a metric radial size that uses a 275-millimeter section width, a 60-series aspect ratio, and a 20-inch rim diameter. For the 2025 Rivian Trucks R1S, it is one of the two 20-inch primary fitments and belongs to a different wheel package than the 22-inch option. This size sits close in overall diameter to the 22-inch fitment, but it still needs to be treated as its own wheel-and-tire combination. It is best evaluated by confirming the actual wheel diameter on the vehicle and then checking use, clearance, and specification priorities within that size.
275/65R20 is a metric radial size with a 275-millimeter section width, a 65-series profile, and a 20-inch rim diameter. On the 2025 Rivian Trucks R1S, it is the taller of the two 20-inch fitments and is available in an all-terrain product from BFGoodrich in the All Terrain TA KO2 series with an RBL sidewall. That makes it especially relevant for owners comparing a more aggressive tread style within the correct size. Selection should still include wheel-width compatibility, load capacity, and the vehicle's actual wheel and suspension setup before use.
Tire fitment remains consistent across the covered 2025 Rivian Trucks R1S sub-models, since both Adventure and Ascend can use the same three primary sizes. The important step is confirming the wheel-and-tire package on the specific vehicle before choosing a replacement.
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2025 Rivian Trucks R1S Adventure
The 2025 Rivian Trucks R1S Adventure can use 275/50R22, 275/60R20, or 275/65R20 radial tires, so fitment begins with identifying which wheel diameter is actually installed. Tire selection then becomes a matter of matching the existing setup and deciding whether the vehicle's use leans more toward road-focused driving or a more all-terrain presentation.
The 2025 Rivian Trucks R1S Ascend follows the same tire-fitment pattern as the Adventure, with 22-inch and 20-inch radial options depending on the wheel package. That keeps size selection straightforward once the wheel diameter is confirmed, after which attention can shift to tread style, load capacity, and wheel-width compatibility.
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.
Best 2025 Rivian Trucks R1S Tires for Sale
Current product choice centers on 275/65R20, where BFGoodrich offers an all-terrain radial in the All Terrain TA KO2 series with an RBL sidewall. For R1S owners, that makes tread character, load capacity, and rim-width compatibility the key comparison points in the product grid.
R1S owners usually start with wheel diameter and exact tire size, then move to practical questions about radial fitment, product selection, and what to inspect before putting a heavy electric SUV back on the road.
Tire Size & Fitment
What tire size fits a 2025 Rivian Trucks R1S?
The 2025 Rivian Trucks R1S uses three primary radial tire sizes: 275/50R22, 275/60R20, and 275/65R20. Those sizes are shared across the Adventure and Ascend sub-models, so the fitment question is less about trim level and more about which wheel-and-tire package is already on the vehicle.
Start by reading the size molded into the current tire sidewall and confirming the wheel diameter before choosing a replacement. A 22-inch tire and a 20-inch tire are not interchangeable simply because the section width looks similar, and the two 20-inch sizes should also be matched carefully to the vehicle's actual setup and intended use.
What size rim does a 2025 Rivian Trucks R1S use?
The 2025 Rivian Trucks R1S uses either a 20-inch or 22-inch rim, depending on the tire size. The 275/50R22 size fits a 22-inch wheel, while both 275/60R20 and 275/65R20 fit a 20-inch wheel.
Confirming rim diameter is the first fitment check because it narrows the tire choice immediately. Once that is settled, compare the exact tire size already on the vehicle, since the two 20-inch options are still different fitments with different overall dimensions and may suit different driving priorities.
Do all 2025 Rivian Trucks R1S sub-models use the same tire size?
The Adventure and Ascend versions of the 2025 Rivian Trucks R1S share the same fitment range: 275/50R22, 275/60R20, and 275/65R20. That means sub-model alone does not lock the vehicle into a single tire size.
The practical step is to verify what is mounted on the individual R1S rather than assuming every Adventure or every Ascend left with the same wheel package. Checking the sidewall size, wheel diameter, and any previous wheel changes helps prevent ordering a correct R1S size that is wrong for that specific vehicle.
Choosing the Right Tire
What should I consider when choosing a 275/65R20 tire for a 2025 Rivian Trucks R1S?
Choosing a 275/65R20 tire for a 2025 Rivian Trucks R1S starts with confirming that the vehicle is actually on the taller 20-inch fitment rather than the 275/60R20 or 275/50R22 package. In this size, available selection includes an all-terrain radial with a 126S service description, which makes size accuracy and specification review especially important.
Compare intended use along with wheel-width compatibility, load capacity, and overall tire character before deciding. A more aggressive all-terrain design may suit an R1S used for mixed terrain, but the vehicle's actual wheel width, suspension condition, and any modifications should still be checked so the tire choice matches the setup rather than just the size code.
What brands offer tires for the 2025 Rivian Trucks R1S?
For the 2025 Rivian Trucks R1S fitments covered here, BFGoodrich appears in 275/65R20 with the All Terrain TA KO2 series. That gives R1S owners at least one clearly defined option in a 20-inch all-terrain radial configuration.
Brand matters most after the correct size and wheel diameter are confirmed. Once the vehicle's actual fitment is verified, compare the tire's construction, sidewall treatment, series character, load figure, and wheel-width range so the brand choice supports how the R1S is driven instead of becoming the first and only decision.
What sidewall styles are available for 2025 Rivian Trucks R1S tires?
Within the currently available 275/65R20 product range for the 2025 Rivian Trucks R1S, the sidewall style shown is RBL. That gives the tire a distinct appearance choice within this size rather than treating every radial option as visually identical.
Sidewall style should be considered alongside tire series and intended use, not as a separate cosmetic decision. On a modern SUV like the R1S, appearance still matters, but wheel diameter, exact size, and the tire's broader purpose remain the main fitment priorities before narrowing the choice by sidewall presentation.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 2025 Rivian Trucks R1S?
Yes. Modifications can affect tire fitment on a 2025 Rivian Trucks R1S even when the tire size itself is one of the correct primary sizes. Aftermarket wheels, suspension changes, ride-height adjustments, or body alterations can all change the clearances that matter once the vehicle is turned, loaded, or driven over uneven surfaces.
Any R1S with changes from its original wheel-and-suspension setup deserves a closer check before a replacement tire is selected. Verify wheel diameter and width first, then inspect inner clearance, fender clearance, and any signs of rubbing so the replacement choice matches the real vehicle configuration rather than the stock fitment range alone.
What should I inspect before driving a 2025 Rivian Trucks R1S on new tires?
Before driving a 2025 Rivian Trucks R1S on new tires, inspect tire pressure, wheel lug torque, valve condition, and visible clearance at the suspension and body. It also helps to confirm that all four tires match the intended size and that the wheel diameter matches the size installed.
A short, careful initial drive is worthwhile to check for vibration, unusual noise, or contact during steering and compression. Because the R1S is a heavy electric SUV, owners should also keep an eye on early wear patterns and air retention so any fitment, alignment, or inflation issue is caught before regular road use.
What should I check before a longer drive in a 2025 Rivian Trucks R1S?
Before a longer drive, make sure the 2025 Rivian Trucks R1S is on the correct tire size for its wheels and that the tires are in sound condition with no cuts, bulges, or irregular wear. Pressure should be set appropriately, and the sidewalls should be inspected for any damage that might not show up in a quick walk-around.
It is also smart to recheck wheel and tire clearance if the vehicle has non-stock wheels or suspension changes. Longer trips place more sustained load and heat into the tires, so catching small issues early helps avoid vibration, uneven wear, and avoidable roadside trouble once the R1S is carrying passengers or cargo.
