Tyre size 205/55 R16 91V: what do the numbers and letters mean?

The code on a tyre sidewall helps you find a suitable replacement. 205/55 R16 91V contains a tyre size, a load index and a speed rating. You may find the code in your vehicle handbook, on a driver's-door label or in a shop search. Before ordering, use the sizes approved for your particular vehicle.

How do you read 205/55 R16?

• 205 is nominal section width in millimetres.
• 55 is the aspect ratio: sidewall height is 55% of the nominal width.
• R means radial construction.
• 16 is the nominal rim diameter in inches.

For example, 205/55 R16 and 205/60 R16 are different sizes: changing the aspect ratio changes the tyre's dimensions. The European Commission's parameter guide explains each element.

What do 91 and V mean?

91 is the load index. In the Commission's table it corresponds to 615 kg per tyre under the specified conditions. V is the speed rating, with a table value of 240 km/h. That is a technical tyre rating, not a suggested driving speed. Choose both ratings according to your vehicle's requirements. Some countries have limited exceptions for winter-tyre speed ratings, so check the applicable local rules before choosing a lower rating.

Where can you confirm the right size?

Compare your vehicle handbook and manufacturer data with the tyres currently fitted. If several tyre and rim combinations are approved, select one complete approved combination. A label near the driver's door may also show tyre pressure; that is a separate setting, not a substitute for confirming the size. If the information conflicts, check with the vehicle manufacturer or a tyre specialist before ordering.

Write down the full size and ratings, such as 205/55 R16 91V. For winter tyres, also check the winter markings and the particular model's performance. Search Rehvidemaailm by the exact size and compare the complete markings on product pages.