2019 Audi A3 — Cabriolet 2.0T quattro Prestige

The 2019 Audi A3 Cabriolet 2.0T quattro Prestige shipped with 2 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.

225/40R18

Section width225 mm
Aspect ratio (sidewall height)40% (90 mm)
Rim diameter18"
Overall tire diameter~25.1"
Revolutions per mile~804

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235/35R19

Section width235 mm
Aspect ratio (sidewall height)35% (82.3 mm)
Rim diameter19"
Overall tire diameter~25.5"
Revolutions per mile~792

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What this size means for your Audi A3

On the 2019 Audi A3 Cabriolet 2.0T quattro Prestige, the factory 225/40R18 measures about 25.1″ in overall diameter with a 90 mm (3.5″) sidewall, and completes roughly 804 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.

The 225/40R18 and 235/35R19 differ in both width and overall diameter (0.4″, 1.6%), which usually means a staggered front/rear setup — the two sizes are not interchangeable side to side, so match each to its correct axle.

Other 2019 Audi A3 trims

Audi A3 tire sizes by year

See every Audi A3 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.