The tyre identification number gives information on:

1. the nominal section width (in inches or mm)

2. the ratio: height / width

3. the registered maximum speed

4. the rim diameter

5. the tyre load

______________________________________________________________________________

Some examples:

3.50 = nominal section width 3.5 inches

- = diagonal casing construction

18 = rim diameter in inches

62 = load index

P = speed index, symbol for registered maximum speed (P = 150 km/h, approx. 93 mph)

TT = tubetype

reinforced = increased tyre load capacity

______________________________________________________________________________

150 = nominal section width in mm

/70 = ratio of height to width = 70 : 100

B = bias belted (construction type)

17 = rim diameter in inches

69 = load index

H = speed index, symbol for registered maximum speed (H = 210 km/h approx 130 mph)

TL = tubeless

______________________________________________________________________________

180 = nominal section width in mm

/55 = ratio of height to width = 55 : 100

ZR = radial construction

17 = rim diameter in inches

TL = tubeless

(73) = load index

(W) = > 270 km/h