2018 Subaru WRX — STI Limited
The 2018 Subaru WRX STI Limited came from the factory equipped with 245/35R19 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.
245/35R19
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (85.8 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~25.8" |
| Revolutions per mile | ~783 |
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What this size means for your Subaru WRX
On the 2018 Subaru WRX STI Limited, the factory 245/35R19 measures about 25.8″ in overall diameter with a 85.8 mm (3.4″) sidewall, and completes roughly 783 revolutions per mile. Its 35-series aspect ratio gives an ultra-low-profile, performance-oriented sidewall that favors steering precision over ride cushioning. In tire terms it is a passenger (P-metric / Euro-metric) size.
Other 2018 Subaru WRX trims
Subaru WRX tire sizes by year
- 2025 Subaru WRX 245/40R18
- 2024 Subaru WRX 235/45R17
- 2023 Subaru WRX 235/45R17
- 2022 Subaru WRX 235/45R17
- 2021 Subaru WRX 245/40R18
- 2020 Subaru WRX 245/40R18
- 2019 Subaru WRX 245/40R18
- 2017 Subaru WRX 245/40R18
- 2016 Subaru WRX 245/40R18
- 2015 Subaru WRX 235/45R17
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.