2008 Audi TT — 2.0T FWD Roadster Base Model
The 2008 Audi TT 2.0T FWD Roadster Base Model 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 |
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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 |
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What this size means for your Audi TT
On the 2008 Audi TT 2.0T FWD Roadster Base Model, 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.
On a vehicle of this age, the Audi TT 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 2008 Audi TT trims
- 2.0T FWD Coupe Base Model 225/50R17 / 245/40R18
- 2.0T FWD Coupe Premium 225/50R17 / 245/40R18 / 255/35R19
- 2.0T FWD Coupe S-Line Package 255/35R19
- 2.0T FWD Roadster Premium 225/50R17 / 245/40R18 / 255/35R19
- 2.0T FWD Roadster S-Line Package 255/35R19
- 3.2T Quattro Coupe Base Model 245/45R17 / 245/40R18
- 3.2T Quattro Coupe S-Line Package 245/40R18 / 255/35R19
- 3.2T Quattro Roadster Base Model 245/45R17 / 245/40R18
- 3.2T Quattro Roadster S-Line Package 245/40R18 / 255/35R19
Audi TT tire sizes by year
- 2023 Audi TT 245/40R18 / 245/35R19
- 2022 Audi TT 245/40R18 / 245/35R19
- 2021 Audi TT 245/40R18 / 245/35R19
- 2020 Audi TT 245/40R18 / 245/35R19
- 2019 Audi TT 245/40R18 / 245/35R19
- 2018 Audi TT 245/40R18 / 245/35R19
- 2017 Audi TT 245/40R18 / 245/35R19
- 2016 Audi TT 245/40R18 / 245/35R19
- 2015 Audi TT 245/40R18 / 255/35R19
- 2014 Audi TT 245/40R18 / 255/35R19
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.