2010 Porsche Cayenne — Optional 390mm Ceramic Brakes

The 2010 Porsche Cayenne Optional 390mm Ceramic Brakes shipped with 3 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.

275/45R19

Section width275 mm
Aspect ratio (sidewall height)45% (123.8 mm)
Rim diameter19"
Overall tire diameter~28.7"
Revolutions per mile~702

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275/40R20

Section width275 mm
Aspect ratio (sidewall height)40% (110 mm)
Rim diameter20"
Overall tire diameter~28.7"
Revolutions per mile~704

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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 Optional 390mm Ceramic Brakes, the factory 275/45R19 measures about 28.7″ in overall diameter with a 123.8 mm (4.9″) sidewall, and completes roughly 702 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 passenger (P-metric / Euro-metric) size.

The 275/45R19 and 275/40R20 roll within 0″ (0%) of each other in overall diameter, so they are interchangeable from a speedometer standpoint — the second size is an optional wheel package rather than a different rolling size.

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.