Technical Info

When it comes to tyre sizes there are three variations as shown below.

265/65R17 106S

265 = section width in mm
65 = aspect ratio, as a %age
R = tyre construction, radial
17 = rim diameter, in inches
106 = load rating (see below)
S = speed rating (see below)

9.50R16LT

9.50 = width in inches
R = tyre construction, radial
16 = rim diameter, in inches
LT = light truck construction

32×11.50R15LT

32 = diameter of tyre mounted on rim in inches
11.50 = section width, in inches
R = tyre construction, radial
15 = rim diameter, in inches
LT = light truck construction

Speed Ratings
Load Ratings
Symbol Max Speed km/h
L 120
M 130
N 140
P 150
Q 160
R 170
S 180
T 190
U 200
H 210
V 240
Index Number Max Load kg
60 250
70 335
80 450
90 600
100 800
110 1060
120 1400
130 1900
140 2500
150 3350
160 4500
170 6000

Overall Diameter Calculator

This device allows you to enter your original fitment tyre size to calculate the diameter of the tyre (that is, the measurement from the top of the tyre to the ground). It will also calculate the rolling circumference. This is important if you are looking for a wider tyre, lower profile or changing rim size, as these figures need to be similar (+/- 2%) so there will be no effect on your speedometer and gearing. You can input a range of different sizes to a suitable size with equivalent diameters and rolling circumferences.





mm mm mm