2018 Toyota Prius — c Four
The 2018 Toyota Prius c Four 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.
175/65R15
| Section width | 175 mm |
|---|---|
| Aspect ratio (sidewall height) | 65% (113.8 mm) |
| Rim diameter | 15" |
| Overall tire diameter | ~24" |
| Revolutions per mile | ~842 |
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195/50R16
| Section width | 195 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (97.5 mm) |
| Rim diameter | 16" |
| Overall tire diameter | ~23.7" |
| Revolutions per mile | ~852 |
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What this size means for your Toyota Prius
On the 2018 Toyota Prius c Four, the factory 175/65R15 measures about 24″ in overall diameter with a 113.8 mm (4.5″) sidewall, and completes roughly 842 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 175/65R15 and 195/50R16 roll within 0.3″ (1.3%) 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 Prius trims
- c One 175/65R15
- c Three 175/65R15
- c Two 175/65R15
- Four 195/65R15
- Four Touring 215/45R17
- One 195/65R15
- Prime Advanced 195/65R15
- Prime Plus 195/65R15
- Prime Premium 195/65R15
- Three 195/65R15
- Three Touring 215/45R17
- Two 195/65R15
- Two Eco 195/65R15
Toyota Prius tire sizes by year
- 2026 Toyota Prius 195/60R17
- 2025 Toyota Prius 195/60R17
- 2024 Toyota Prius 195/60R17
- 2023 Toyota Prius 195/60R17
- 2022 Toyota Prius 195/65R15
- 2021 Toyota Prius 195/65R15
- 2020 Toyota Prius 195/65R15
- 2019 Toyota Prius 175/65R15
- 2017 Toyota Prius 175/65R15 / 195/50R16
- 2016 Toyota Prius 175/65R15 / 195/50R16
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.