Tire sizes.
D - outer diameter,
d - landing diameter of the wheel rim,
H - tire profile height,
W - profile width.
When changing tires, use only tires of the same size and design as the recommended tires for your vehicle and with the same or greater load capacity.
The use of tires of any other size or type can seriously affect handling, comfort, speedometer/odometer accuracy, ground clearance, fuel economy, distance between the body and the tire or snow chain.
Attention: do not mix radial and diagonal tires. This can cause dangerous vehicle behavior leading to loss of control.
The following designations are possible in the marking:
185 - conditional profit width; expressed in millimetres. Valuable size is selected based on the table '' Tire marking and tire pressure", and must match the tire size recommended by the manufacturer.
55 - the ratio of the height of the tire profile to its width, expressed as a percentage (%),
If this designation is absent, then the ratio is 0.80... 0.82. This size is selected based on the table "Tire markings and tire pressure", and must match the tire size recommended by the manufacturer.
R - designation of the radial tire.
B - designation of a diagonal tire. Radial and bias tires differ in the arrangement of the cords. Radial tires have lower rolling resistance, longer life than bias tyres.
15 - tire diameter, expressed in inches. This size is selected based on the table "Tire markings and tire pressure", and must match the tire size recommended by the manufacturer.
81 - conditional index of carrying capacity. It is selected based on the table "Tire load indexes".
V is the tire speed index. It is selected based on the table "Tire speed indices":
Table. Tire speed indices