2021 Mercedes-Benz GLC 43 — AMG 4MATIC SUV
The 2021 Mercedes-Benz GLC 43 AMG 4MATIC SUV shipped with 4 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.
255/45R20 (Front)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 45% (114.8 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~695 |
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285/40R20 (Rear)
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (114 mm) |
| Rim diameter | 20" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~696 |
Compare prices at:
255/40R21 (Front)
| Section width | 255 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (102 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~29" |
| Revolutions per mile | ~695 |
Compare prices at:
285/35R21 (Rear)
| Section width | 285 mm |
|---|---|
| Aspect ratio (sidewall height) | 35% (99.8 mm) |
| Rim diameter | 21" |
| Overall tire diameter | ~28.9" |
| Revolutions per mile | ~699 |
Compare prices at:
What this size means for your Mercedes-Benz GLC 43
On the 2021 Mercedes-Benz GLC 43 AMG 4MATIC SUV, the factory 255/45R20 measures about 29″ in overall diameter with a 114.8 mm (4.5″) sidewall, and completes roughly 695 revolutions per mile. Its 45-series aspect ratio gives a low-profile sidewall tuned for sharper handling, common on sport trims and larger-wheel packages. In tire terms it is a large-diameter fitment.
This is a staggered setup: the front axle runs 255/45R20 and the rear runs 285/40R20. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.
Other 2021 Mercedes-Benz GLC 43 trims
- AMG 4MATIC Coupe 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
Mercedes-Benz GLC 43 tire sizes by year
- 2026 Mercedes-Benz GLC 43 265/45R20 (Front) / 295/40R20 (Rear) / 265/40R21 (Front) / 295/35R21 (Rear)
- 2025 Mercedes-Benz GLC 43 265/45R20 (Front) / 295/40R20 (Rear) / 265/40R21 (Front) / 295/35R21 (Rear)
- 2024 Mercedes-Benz GLC 43 265/45R20 (Front) / 295/40R20 (Rear) / 265/40R21 (Front) / 295/35R21 (Rear)
- 2023 Mercedes-Benz GLC 43 265/45R20 (Front) / 295/40R20 (Rear) / 265/40R21 (Front) / 295/35R21 (Rear)
- 2022 Mercedes-Benz GLC 43 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
- 2020 Mercedes-Benz GLC 43 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
- 2019 Mercedes-Benz GLC 43 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
- 2018 Mercedes-Benz GLC 43 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (Rear)
- 2017 Mercedes-Benz GLC 43 255/45R20 (Front) / 285/40R20 (Rear) / 255/40R21 (Front) / 285/35R21 (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.