2025 Mercedes-Benz GLS63 — AMG

The 2025 Mercedes-Benz GLS63 AMG shipped with 6 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.

275/50R21 (Front)

Section width275 mm
Aspect ratio (sidewall height)50% (137.5 mm)
Rim diameter21"
Overall tire diameter~31.8"
Revolutions per mile~634

Compare prices at:

315/45R21 (Rear)

Section width315 mm
Aspect ratio (sidewall height)45% (141.8 mm)
Rim diameter21"
Overall tire diameter~32.2"
Revolutions per mile~627

Compare prices at:

285/45R22 (Front)

Section width285 mm
Aspect ratio (sidewall height)45% (128.3 mm)
Rim diameter22"
Overall tire diameter~32.1"
Revolutions per mile~628

Compare prices at:

325/40R22 (Rear)

Section width325 mm
Aspect ratio (sidewall height)40% (130 mm)
Rim diameter22"
Overall tire diameter~32.2"
Revolutions per mile~626

Compare prices at:

285/40R23 (Front)

Section width285 mm
Aspect ratio (sidewall height)40% (114 mm)
Rim diameter23"
Overall tire diameter~32"
Revolutions per mile~631

Compare prices at:

325/35R23 (Rear)

Section width325 mm
Aspect ratio (sidewall height)35% (113.8 mm)
Rim diameter23"
Overall tire diameter~32"
Revolutions per mile~631

Compare prices at:

What this size means for your Mercedes-Benz GLS63

On the 2025 Mercedes-Benz GLS63 AMG, the factory 275/50R21 measures about 31.8″ in overall diameter with a 137.5 mm (5.4″) sidewall, and completes roughly 634 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 large-diameter fitment.

This is a staggered setup: the front axle runs 275/50R21 and the rear runs 315/45R21. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.

Mercedes-Benz GLS63 tire sizes by year

See every Mercedes-Benz GLS63 year & trim →

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.