Tire Conversion Chart

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TIRE CONVERSION CHARTS
Street Tire Size Designation
Motorcycle Knobby Tire
Size
Inch Designations
Front Tires
5.00
H
16
4PR
Metric 4-Stroke Metric Inch
Casing strength (ply rating)
70/100
80/90
2.50-2.75
Rim diameter
80/100
90/90
2.75-3.00
Speed Rating
Section width (inches)
90/100
90/100
3.00-3.25
Alphabetical Designations
Rear Tires
Metric 4-Stroke Metric Inch
M
T
90
- 60
Load Range B
Load range
90/100
110/90
3.60-4.10
Rim diameter (inches)
100/100
120/80
4.00-4.10
Aspect ratio (90%)
110/100
130/80
4.00-4.50
Tire width code
Motorcycle code
120/100
140/80
5.00-5.10
Metric Designations
130/
90
- 16
67
H
Speed rating
Load rating
Speed Rating
Rim diameter (inches)
Aspect ratio (90%)
Maximum Design/Test Speed
Selection width (mm)
Tire Rating
(mph)
(km/h)
Load Rating - A numerical code which corresponds to the total load
carrying capacity at the speed indicated by the speed symbol.
F Type
50
80
J Type
62
100
Section Height
Aspect Ratio =
X 100
L Type
75
120
Section Width
M Type
81
130
Section Height
Aspect Ratio =
X 100
Section Width
N Type
87
140
P Type
94
150
R Type
106
170
S Type
112
180
H Type
130
210
Motorcycle Street Tire Size
V Type
149
240
Rear Tires
Front Tires
Z Type
149 +
240 +
Metric
Alpha
Inch
Metric
Alpha
Inch
W Type
160
270
80/90
MH90
2.50-2.75 110/90
MP85
4.00-4.25
90/90
MJ90
2.75-3.00 120/90
MR90
4.50-4.75
100/90
MM90
3.25-3.50 130/80
5.00-5.10
110/90
MN90
3.75-4.00 130/90
MT90
5.00-5.10
120/80
4.25-4.50 140/80
5.50-6.00
120/90
MR90
4.25-4.50 140/90
MU90
5.50-6.00
Off-Road Tire Inflation Pressure Guide
130/90
MT90
5.00-5.10 150/80
MV85
6.00-6.25
Tire Use
Front PSI
Rear PSI
150/90
MV85
6.00-6.25
Motocross Hard Terrain
10-12
10-12
Motocross Intermediate Terrain
12-14
12-14
Motocross Soft Terrain
10-11
10-11
Desert/ Enduro
14-18
14-18
Dual-Sport
18-22
16-26
Off Road Tire Application Chart
Engine cc
Front
Rear
Engine cc
Front
Rear
50
2.50-10
2.75-10
100-125
80/100-21
100/100-18 or 100/90-19
60
2.50-14
80/100-12
250
80/100-21
110/100-18 or 110/90-19
80
70/100-17
90/100-14
500
80/100-21
120/100-18 or 120/90-19
80-100
70/100-19
90/100-16
18
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