2023 Ford Explorer — Platinum
The 2023 Ford Explorer Platinum came from the factory equipped with 275/45R21 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.
275/45R21
| Section width | 275 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (123.8 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~30.7" |
| Revolutions per mile | ~656 |
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What this size means for your Ford Explorer
On the 2023 Ford Explorer Platinum, the factory 275/45R21 measures about 30.7″ in overall diameter with a 123.8 mm (4.9″) sidewall, and completes roughly 656 revolutions per mile. Its 45-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a large-diameter fitment.
Other 2023 Ford Explorer trims
- Base 255/65R18
- King Ranch 255/55R20
- Limited 255/55R20
- ST 255/55R20 / 275/45R21
- ST-Line 255/55R20 / 275/45R21
- Timberline 265/65R18
- XLT 255/65R18 / 255/55R20
Ford Explorer tire sizes by year
- 2026 Ford Explorer 255/65R18 / 255/55R20
- 2025 Ford Explorer 255/65R18 / 255/55R20
- 2024 Ford Explorer 255/65R18
- 2022 Ford Explorer 255/65R18
- 2021 Ford Explorer 255/65R18
- 2020 Ford Explorer 255/65R18
- 2019 Ford Explorer 245/60R18
- 2018 Ford Explorer 245/60R18
- 2017 Ford Explorer 245/60R18
- 2016 Ford Explorer 245/60R18
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.