In the example picture above, the tyre details are 195/55 R16 87V
195 is the tyre’s width in millimetres.
55 is the tyre’s profile.
R indicates the tyre’s construction type (in this case radial).
16 is the wheel rim diameter in inches.
87 is the vehicle’s load index (the maximum load it can carry).
V is the tyre’s maximum speed rating.