How to read a tyre size
How to read a tyre size
The sidewall of every tyre shows everything you need to order. An example:
205/55 R 16 91 V
| 205 | Tyre width in millimetres |
| 55 | Aspect ratio in percent (sidewall height = 55% of 205 mm) |
| R | Radial construction (D = bias-ply, B = bias-belted) |
| 16 | Rim diameter in inches |
| 91 | Load index – 91 = 615 kg per tyre |
| V | Speed index – V = up to 240 km/h |
Additional letters
- C (e.g. 235/65 R16C) – Commercial, reinforced version for vans
- XL or Reinforced – reinforced casing, higher load capacity
- TL – tubeless, TT – with tube (tube type)
- M+S and snowflake – suitable for winter, see winter tyre rules
Truck sizes
Truck tyre markings look similar, e.g. 315/80 R 22.5 156/150 L. The double load index means: 156 for single fitment, 150 for dual fitment.
Also check which axle the tread is approved for: steer, drive and trailer axles use different tread patterns and compounds.
Agricultural and industrial tyres
Here you will find both systems side by side. Metric: 520/70 R 38. Inch: 18.4 R 38. Many tyres carry both. Often there is also a tread code such as R-1W (field tread, deeper lugs) or a ply rating such as 16PR.
Where else to find the size
In the vehicle registration document (registration certificate part I), fields 15.1 and 15.2. These list the sizes approved by the manufacturer – stick to them, otherwise the vehicle's type approval becomes invalid.
Not sure?
Use the size search on the home page or call us: +43 670 306 1217. Just tell us the numbers on the sidewall – we will find the right tyre.