The meaning of motorcycle tire and inner tube size indication

  • Motorcycle tire size indication
  • Motorcycle inner tube size indication

There are many symbols on a motorcycle tires. usually including: size,brand,tire type(TT/TL),ply rating,load capacity,speed symbols,rotation,the certification ID(such as DOT,ISO,ECE,etc),TWI,sometimes, also have the manufacture’s mold ID.

Tire Sizes indication:

Metric representation for example 110/90-16

  • 110:Width Section
  • 90: Sidewall of the tire is 90% of width section, which is 99mm
  • – : Which means bias tire
  • 16:The rim is 16 inches.

Imperial representation for example 3.00-18

  • 3.00: Width Section
  • – : Which means bias tire
  • 17: The rim is 17 inches.

The premise of the above data is that the tire is installed on a standard wheel hub and filled with standard air pressure. But because rubber tires are elasticthe,and the datas still have ±4% errors.

Inner Tube indication:

Acctually,inner tube don’t have metric represention size, because inner tube is circle when inflate pressure. but if you use it in the tire of metric represention size is also ok. Although the shape of the outer tire limits the shape of the inner tube, the inner tube can still play a role due to the wrapping of the outer tire.

Now let’s talk about the load capacity and speed symbol.Every ply rating has the relative load capacity and speed symbols.The details are as follows:

Motorcycle Street Tire Size

Front

MetricAlphabeticalInch
80/90MH902.50/2.75
90/90MJ902.75/3.00
100/90MM903.25/3.50
110/90MM903.75/4.00
120/804.25/4.50
120/90MR904.25/4.50
130/90MT905.00/5.10

Rear

MetricAlphabeticalInch
110/90MN903.75/4.25
120/80MP854.50/4.75
120/90MP854.50/4.75
130/805.00/5.10
130/90MT905.00/5.10
140/805.50/6.00
140/90MU905.50/6.00
150/80MV856.00/6.25
150/90MB856.00/6.25

Pry Rating and LI⁄SS Conversion

Pry RatingLI/SS
2.75-10 2Pry2.75-10 26J
2.75-10 4Pry2.75-10 38J
3.00-10 2Pry3.00-10 32J
3.00-10 4Pry3.00-10 42J
3.50-10 2Pry3.50-10 41J
3.50-10 4Pry3.50-10 51J
Pry RatingLI/SS
2.75-14 4Pry2.75-14 35P
2.75-14 6Pry2.75-14 41P
2.25-17 4Pry2.25-17 33L
2.50-17 4Pry2.50-17 38L
2.50-17 6Pry2.50-17 43L

Load Rating (Load Index:LI)

Load Index
LIKGSLBS
2182.5182
2285187
2387.5193
2490198
2592.5204
2695209
2797.5215
28100220
29103227
30106234
31109240
32112247
33115254
34118260
35121267
36125276
37128282
38132291
39136300
40140309
41145320
42150331
43155342
44160353
45165364
46170375
47175386
48180397
49185408
50190419
LIKGSLBS
51195430
52200441
53206454
54212467
55218481
56224494
57230507
58236520
59243536
60250551
61257567
62265584
63272600
64280617
65290639
66300661
67307677
68315694
69325716
70335736
71345761
72355783
73365805
74375827
75387853
76400882
77412908
78425937
79437963

Speed Rating (Speed Symbol:SS) for Motorcycle use

Speed Symbol
SSKm/hMph
F8050
J10062
L12075
M13081
N14087
P15094
R170106
S180112
H210130
V240149
Z240+149+
W270168
(W)270+168+

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