2019 Porsche 718 — Boxster S

The 2019 Porsche 718 Boxster S 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.

235/40R19 (Front)

Section width235 mm
Aspect ratio (sidewall height)40% (94 mm)
Rim diameter19"
Overall tire diameter~26.4"
Revolutions per mile~764

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265/40R19 (Rear)

Section width265 mm
Aspect ratio (sidewall height)40% (106 mm)
Rim diameter19"
Overall tire diameter~27.3"
Revolutions per mile~738

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235/35R20 (Front)

Section width235 mm
Aspect ratio (sidewall height)35% (82.3 mm)
Rim diameter20"
Overall tire diameter~26.5"
Revolutions per mile~762

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265/35R20 (Rear)

Section width265 mm
Aspect ratio (sidewall height)35% (92.8 mm)
Rim diameter20"
Overall tire diameter~27.3"
Revolutions per mile~739

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What this size means for your Porsche 718

On the 2019 Porsche 718 Boxster S, the factory 235/40R19 measures about 26.4″ in overall diameter with a 94 mm (3.7″) sidewall, and completes roughly 764 revolutions per mile. Its 40-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.

This is a staggered setup: the front axle runs 235/40R19 and the rear runs 265/40R19. The two sizes are not interchangeable, so order each for its correct axle and don't rotate front-to-rear.

Other 2019 Porsche 718 trims

Porsche 718 tire sizes by year

See every Porsche 718 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.