2017 Ford Mustang — Fastback GT
The 2017 Ford Mustang Fastback GT shipped with 3 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.
235/50R18
| Section width | 235 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (117.5 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~27.3" |
| Revolutions per mile | ~740 |
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255/40R19
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (102 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~27" |
| Revolutions per mile | ~746 |
Compare prices at:
265/35R20
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (92.8 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~27.3" |
| Revolutions per mile | ~739 |
Compare prices at:
What this size means for your Ford Mustang
On the 2017 Ford Mustang Fastback GT, the factory 235/50R18 measures about 27.3″ in overall diameter with a 117.5 mm (4.6″) sidewall, and completes roughly 740 revolutions per mile. Its 50-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.
The 235/50R18 and 255/40R19 roll within 0.3″ (1.1%) 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 2017 Ford Mustang trims
- Convertible CeoBoost 235/55R17 / 235/50R18 / 255/40R19
- Convertible EcoBoost Performance Pkg 255/40R19
- Convertible GT 235/50R18 / 255/40R19 / 265/35R20
- Convertible GT Performance Pkg 255/40R19 (Front) / 275/40R19 (Rear)
- Convertible V6 235/55R17 / 235/50R18
- Fastback EcoBoost 235/55R17 / 235/50R18 / 255/40R19
- Fastback EcoBoost Performance Pkg 255/40R19
- Fastback GT Performance Pkg 255/40R19 (Front) / 275/40R19 (Rear)
- Fastback V6 235/55R17 / 235/50R18
- Shelby GT350 295/35R19 (Front) / 305/35R19 (Rear)
- Shelby GT350R 305/30R19 (Front) / 315/30R19 (Rear)
Ford Mustang tire sizes by year
- 2026 Ford Mustang 255/40R19 / 265/35R20
- 2025 Ford Mustang 255/40R19 / 265/35R20
- 2024 Ford Mustang 255/40R19 / 265/35R20
- 2023 Ford Mustang 235/55R17 / 235/50R18 / 255/40R19
- 2022 Ford Mustang 235/55R17 / 235/50R18 / 255/40R19 / 265/40R19
- 2021 Ford Mustang 235/55R17 / 235/50R18 / 255/40R19 / 265/40R19
- 2020 Ford Mustang 255/40R19 (Front) / 275/40R19 (Rear)
- 2019 Ford Mustang 255/40R19 (Front) / 275/40R19 (Rear)
- 2018 Ford Mustang 235/55R17 / 235/50R18 / 255/40R19
- 2016 Ford Mustang 235/55R17 / 235/50R18 / 255/40R19
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.