2021 Audi A4 — quattro Premium
The 2021 Audi A4 quattro Premium 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.
225/50R17
| Section width | 225 mm |
|---|---|
| Aspect ratio (sidewall height) | 50% (112.5 mm) |
| Rim diameter | 17" |
| Overall tire diameter | ~25.9" |
| Revolutions per mile | ~780 |
Compare prices at:
245/40R18
| Section width | 245 mm |
|---|---|
| Aspect ratio (sidewall height) | 40% (98 mm) |
| Rim diameter | 18" |
| Overall tire diameter | ~25.7" |
| Revolutions per mile | ~784 |
Compare prices at:
What this size means for your Audi A4
On the 2021 Audi A4 quattro Premium, the factory 225/50R17 measures about 25.9″ in overall diameter with a 112.5 mm (4.4″) sidewall, and completes roughly 780 revolutions per mile. Its 50-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 passenger (P-metric / Euro-metric) size.
The 225/50R17 and 245/40R18 roll within 0.2″ (0.8%) 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.
Other 2021 Audi A4 trims
- Allroad Premium 245/45R18
- Allroad Premium Plus 245/45R18
- Allroad Prestige 245/45R18
- quattro Premium Plus 245/40R18 / 245/35R19
- quattro Prestige 245/40R18 / 245/35R19
Audi A4 tire sizes by year
- 2025 Audi A4 245/45R18
- 2024 Audi A4 245/45R18
- 2023 Audi A4 245/45R18
- 2022 Audi A4 245/45R18
- 2020 Audi A4 225/50R17 / 245/40R18
- 2019 Audi A4 225/50R17 / 245/40R18
- 2018 Audi A4 225/50R17 / 245/40R18
- 2017 Audi A4 225/50R17 / 245/40R18
- 2016 Audi A4 245/45R17 / 245/40R18
- 2015 Audi A4 245/45R17 / 245/40R18
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.