2010 Porsche Cayenne — GTS

The 2010 Porsche Cayenne GTS came from the factory equipped with 295/35R21 tires. If your vehicle has since been fitted with aftermarket or upsized wheels, your actual tire size may no longer match this factory spec — always confirm against your door placard before buying.

295/35R21

Section width295 mm
Aspect ratio (sidewall height)35% (103.3 mm)
Rim diameter21"
Overall tire diameter~29.1"
Revolutions per mile~692

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What this size means for your Porsche Cayenne

On the 2010 Porsche Cayenne GTS, the factory 295/35R21 measures about 29.1″ in overall diameter with a 103.3 mm (4.1″) sidewall, and completes roughly 692 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 large-diameter fitment.

On a vehicle of this age, the Porsche Cayenne may have been refitted with a slightly different replacement size somewhere in its life, so check the current sidewall — not just the factory spec — before buying.

Other 2010 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.