Use these tables to convert your older style sizing to the new style metric sizing.
STREET TIRES
Front Tires
Metric
Alpha
Inch
80/90
MG90
2.50/2.75
90/90
MJ90
2.75/3.00
100/80
MJ90
3.00
100/90
MM90
3.25/3.50
110/70
-
-
110/80
-
3.25/3.50
110/90
MN90
3.75/4.00
120/80
-
-
120/70
-
-
120/80
-
3.75/4.25/4.60
120/90
MR90
4.25/4.50
130/60
-
-
130/70
-
-
130/90
MT90
5.00/5.10
Rear Tires
Metric
Alpha
Inch
110/90
MN90
3.75/4.25
120/80
MP85
4.50/4.75
120/90
MP85
4.50/4.75
130/70
-
-
130/80
-
5.00/5.10
130/90
MT90
5.00/5.10
140/60
-
-
140/70
-
-
140/80
-
5.50/6.00
140/90
MU90
5.50/6.00
150/70
-
-
150/80
MV85
6.00/6.25
150/90
MV85
6.00/6.25
160/60
-
-
160/70
-
-
160/80
-
-
170/60
-
-
170/80
-
-
180/50
-
-
180/55
-
-

 
DIRT TIRES
Front Tires
Metric
Repl. Size
Inch
60/100
90/80
2.50/2.75
70/100
-
2.75/3.00
80/100
90/90
3.00
Rear Tires
Metric
Metric
Metric
Low
Profile
Inch
80/100
-
80/90
-
2.50/3.00
-
110/80
100/90
4.10
3.25/3.50
90/100
-
110/90
4.10
3.60/4.10
100/100
120/80
-
4.10
4.00/4.10
110/100
130/80
120/90
4.60
4.00/4.50
120/100
140/80
130/90
5.10
5.00/5.10
-
150/80
-
5.60
5.50

 
 
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