RIDE Calendar‎ > ‎

Tyre Codes

 DATE - SIZE/TYPE - LOAD - SPEED
 
DATE of Manufacture : Date Code is WWYY  :  as in "Week/Year"
 Date = 4 Digit Number : Manufactures Date Code   eg.  0911 = 9th Week of 2011
    3 digit number : used prior to 2000 date code is WWY  eg. 378 = 37th week of 1998
    New tyres should be less than 3 years old, recommend discarding motorcycle tyres after 8 years.
 
SIZE/TYPE :  [4]  most common are:
 Width = 3 Digit Number : "millimeters" (nom. cross section width, widest point outer edges of tyre)
    /  slash character  (for character separation)
 Height/Width = 2 or 3 Digit Number : "aspect ratio" (sidewall height / total width, of the tyre, as %)
    An optional letter indicating construction of the fabric carcass of the tire:
    B: bias belt: (where the sidewalls are the same material as the tread, leading to a rigid ride)
    D: diagonal
    R: radial  (if omitted, then it is a cross ply tyre)
 Wheel Diameter = 2 Digit Number : "inches" (Diameter of the wheel that the tyre is designed to fit)
 
LOAD Index :
 Load = 2 or 3 Digit Number : see table below
 
SPEED Rating :
Speed = 1 or 2 Digit or Letter combo : see table below
 
OTHER Ratings : (DOT etc) included for other countries : Tyre Codes etc  M/C Tyres etc  
 
AN Example :  Sport/Touring Motorcycle, Rear Tyre :
MICHELIN PILOT ROAD 3 :  Stamped:  180/55 ZR 17 - (73W) - 0911
  180/55  =  180 = 180 mm Wide  /  55 = 55% Height/Width Ratio
  ZR 17   =  Z = >240 km/hr + R=Radial + 17=17" Rim
  (73W)   =  73 =
 <365 kg Load + W = >270 km/hr
  0911     =  09 = 9th Week + 11 = Mar 2011 Manufacture
 
Load Index
L I 
  kg   
 L I 
  kg    
 L I 
  kg    
 L I 
  kg     
 L I 
  kg   
19
77,5
36
125,0
53
206
70
335,0
87
545,0
20
80,0
37
128,0
54
212,0
71
345,0
88
560,0
21
82,5
38
132,0
55
218,0
72
355,0
89
580,0
22
85,0
39
136,0
56
224,0
73
365,0
90
600,0
23
87,5
40
140,0
57
230,0
74
375,0
91
615,0
24
90,0
41
145,0
58
236,0
75
387,0
92
630,0
25
92,0
42
150,0
59
243,0
76
400,0
93
650,0
26
95,0
43
155,0
60
250,0
77
412,0
94
670,0
27
97,5
44
160,0
61
257,0
78
425,0
95
690,0
28
100,0
45
165,0
62
265,0
79
437,0
96
710,0
29
103,0
46
170,0
63
272,0
80
450,0
97
730,0
30
106,0
47
175,0
64
280,0
81
462,0
98
750,0
31
109,0
48
180,0
65
290,0
82
475,0
99
775,0
32
112,0
49
185,0
66
300,0
83
487,0
100
800,0
33
115,0
50
190,0
67
307,0
84
500,0
-
-
34
118,0
51
195,0
68
315,0
85
510
-
-
35
121,0
52
200,0
69
325
86
530,0
-
-
    
Speed Rating [4] 
 Rating 
Speed (km/h)
Speed (mph)
Moped
50
30
J
100
62
K
110
69
L
120
75
M
130
81
P (or-)
150
95
Q
160
100
R
170
105
S
180
113
T
190
118
U
200
125
H
210
130
V
240
150
W
over 270
over 168
Z
over 240
over 150