2023 Rivian R1T — Adventure
The 2023 Rivian R1T Adventure shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
275/55R21
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (151.3 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~32.9" |
| Revolutions per mile | ~613 |
Compare prices at:
275/50R22
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (137.5 mm) |
| Rim diameter | 22" |
| Overall tire diameter | ~32.8" |
| Revolutions per mile | ~614 |
Compare prices at:
What this size means for your Rivian R1T
On the 2023 Rivian R1T Adventure, the factory 275/55R21 measures about 32.9″ in overall diameter with a 151.3 mm (6″) sidewall, and completes roughly 613 revolutions per mile. Its 55-series aspect ratio gives a balanced everyday-passenger profile — enough sidewall to soak up road shock while keeping steering response crisp. In tire terms it is a large-diameter fitment.
The 275/55R21 and 275/50R22 roll within 0.1″ (0.3%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.
Other 2023 Rivian R1T trims
- All Terrain Tires 275/65R20
- Explore 275/55R21 / 275/50R22
Rivian R1T tire sizes by year
- 2026 Rivian R1T 275/65R20
- 2025 Rivian R1T 275/65R20
- 2024 Rivian R1T 275/55R21 / 275/50R22
- 2022 Rivian R1T 275/55R21 / 275/50R22
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.