2026 Porsche Cayenne — Base Model

The 2026 Porsche Cayenne Base Model 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.

255/55R20 (Front)

Section width255 mm
Aspect ratio (sidewall height)55% (140.3 mm)
Rim diameter20"
Overall tire diameter~31"
Revolutions per mile~650

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295/45R20 (Rear)

Section width295 mm
Aspect ratio (sidewall height)45% (132.8 mm)
Rim diameter20"
Overall tire diameter~30.5"
Revolutions per mile~662

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285/45R21 (Front)

Section width285 mm
Aspect ratio (sidewall height)45% (128.3 mm)
Rim diameter21"
Overall tire diameter~31.1"
Revolutions per mile~649

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315/40R21 (Rear)

Section width315 mm
Aspect ratio (sidewall height)40% (126 mm)
Rim diameter21"
Overall tire diameter~30.9"
Revolutions per mile~652

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285/40R22 (Front)

Section width285 mm
Aspect ratio (sidewall height)40% (114 mm)
Rim diameter22"
Overall tire diameter~31"
Revolutions per mile~651

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315/35R22 (Rear)

Section width315 mm
Aspect ratio (sidewall height)35% (110.3 mm)
Rim diameter22"
Overall tire diameter~30.7"
Revolutions per mile~657

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What this size means for your Porsche Cayenne

On the 2026 Porsche Cayenne Base Model, the factory 255/55R20 measures about 31″ in overall diameter with a 140.3 mm (5.5″) sidewall, and completes roughly 650 revolutions per mile. Its 55-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 255/55R20 and the rear runs 295/45R20. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.

Other 2026 Porsche Cayenne trims

Porsche Cayenne tire sizes by year

See every Porsche Cayenne 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.