2012 Kia Sportage — SX
The 2012 Kia Sportage SX came from the factory equipped with 235/55R18 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.
235/55R18
| Section width | 235 mm |
|---|---|
| Aspect ratio (sidewall height) | 55% (129.3 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~28.2" |
| Revolutions per mile | ~716 |
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What this size means for your Kia Sportage
On the 2012 Kia Sportage SX, the factory 235/55R18 measures about 28.2″ in overall diameter with a 129.3 mm (5.1″) sidewall, and completes roughly 716 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 passenger (P-metric / Euro-metric) size.
Other 2012 Kia Sportage trims
- Base Model 215/70R16
- EX 235/55R18
- LX 215/70R16 / 225/60R17
Kia Sportage tire sizes by year
- 2026 Kia Sportage 235/60R18
- 2025 Kia Sportage 235/60R18
- 2024 Kia Sportage 235/60R18
- 2023 Kia Sportage 235/60R18
- 2022 Kia Sportage 225/55R18
- 2021 Kia Sportage 225/55R18
- 2020 Kia Sportage 225/55R18
- 2019 Kia Sportage 225/55R18
- 2018 Kia Sportage 225/55R18
- 2017 Kia Sportage 225/55R18
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.