2018 Mercedes-Benz AMG GT — C Roadster
The 2018 Mercedes-Benz AMG GT C Roadster 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.
265/35R19 (Front)
| Section width | 265 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (92.8 mm) |
| Rim diameter | 19" |
| Overall tire diameter | ~26.3" |
| Revolutions per mile | ~767 |
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305/30R20 (Rear)
| Section width | 305 mm |
|---|---|
| Aspect ratio (sidewall height) | 30% (91.5 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~27.2" |
| Revolutions per mile | ~741 |
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What this size means for your Mercedes-Benz AMG GT
On the 2018 Mercedes-Benz AMG GT C Roadster, the factory 265/35R19 measures about 26.3″ in overall diameter with a 92.8 mm (3.7″) sidewall, and completes roughly 767 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.
This is a staggered setup: the front axle runs 265/35R19 and the rear runs 305/30R20. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2018 Mercedes-Benz AMG GT trims
Mercedes-Benz AMG GT tire sizes by year
- 2026 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2025 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2024 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2023 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2022 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2021 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2020 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2019 Mercedes-Benz AMG GT 255/45R19 (Front) / 285/40R19 (Rear) / 265/40R20 (Front) / 295/35R20 (Rear) / 275/35R21 (Front) / 315/30R21 (Rear)
- 2017 Mercedes-Benz AMG GT 265/35R19 (Front) / 295/30R20 (Rear)
- 2016 Mercedes-Benz AMG GT 265/35R19 (Front) / 295/30R20 (Rear)
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.