2018 Toyota Tundra — 1794 Edition
The 2018 Toyota Tundra 1794 Edition 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.
275/65R18
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (178.8 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~32.1" |
| Revolutions per mile | ~629 |
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275/55R20
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (151.3 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~31.9" |
| Revolutions per mile | ~632 |
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What this size means for your Toyota Tundra
On the 2018 Toyota Tundra 1794 Edition, the factory 275/65R18 measures about 32.1″ in overall diameter with a 178.8 mm (7″) sidewall, and completes roughly 629 revolutions per mile. Its 65-series aspect ratio gives a taller, comfort-biased sidewall that favors ride quality and shrugs off rough pavement. In tire terms it is a passenger (P-metric / Euro-metric) size.
The 275/65R18 and 275/55R20 roll within 0.2″ (0.6%) 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 2018 Toyota Tundra trims
- Limited 275/65R18 / 275/55R20
- Platinum 275/55R20
- SR 255/70R18
- SR5 255/70R18 / 275/65R18
- TRD Off-Road Package 275/65R18
- TRD Pro 275/65R18
- TRD Sport Package 275/55R20
Toyota Tundra tire sizes by year
- 2026 Toyota Tundra 265/60R20
- 2025 Toyota Tundra 265/60R20
- 2024 Toyota Tundra 265/60R20
- 2023 Toyota Tundra 265/60R20
- 2022 Toyota Tundra 265/60R20
- 2021 Toyota Tundra 275/65R18 / 275/55R20
- 2020 Toyota Tundra 275/65R18 / 275/55R20
- 2019 Toyota Tundra 275/65R18 / 275/55R20
- 2017 Toyota Tundra 255/70R18 / 275/65R18 / 275/55R20
- 2016 Toyota Tundra 255/70R18 / 275/65R18 / 275/55R20
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.