2021 GMC Canyon — Base Model
The 2021 GMC Canyon Base Model came from the factory equipped with 265/60R18 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.
265/60R18
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 60% (159 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~30.5" |
| Revolutions per mile | ~661 |
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What this size means for your GMC Canyon
On the 2021 GMC Canyon Base Model, the factory 265/60R18 measures about 30.5″ in overall diameter with a 159 mm (6.3″) sidewall, and completes roughly 661 revolutions per mile. Its 60-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.
Other 2021 GMC Canyon trims
GMC Canyon tire sizes by year
- 2026 GMC Canyon 265/65R18 / 275/60R20
- 2025 GMC Canyon 265/65R18 / 275/60R20
- 2024 GMC Canyon 265/65R18 / 275/65R18 / 275/60R20
- 2023 GMC Canyon 265/65R18 / 275/65R18 / 275/60R20
- 2022 GMC Canyon 255/65R17 / 265/65R17
- 2020 GMC Canyon 255/65R17 / 265/65R17
- 2019 GMC Canyon 255/65R17 / 265/65R17
- 2018 GMC Canyon 255/65R17 / 265/65R17
- 2017 GMC Canyon 265/70R16 / 255/65R17 / 265/60R18
- 2016 GMC Canyon 265/70R16 / 255/65R17 / 265/60R18
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.