Motorcycle Sprocket Size/Ratio Calculator
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Honda SL125 (1971-1973)
Front
Rear
Chain
Links
Honda SL125 (1971-1973)
15
26
428
110
Select current size of front and rear sprockets
as well as the new sizes.
FRONT
REAR
LINKS
CURRENT
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
NEW
10
11
12
13
14
15
16
17
18
19
20
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
114
Link count is approximate.
Make sure chain is long enough before you cut it.
Front
Rear
Ratio
Torque
Speed
15T
24T
1.60
-8.3%
+8.3%
15T
25T
1.67
-4.0%
+4.0%
15T
26T
1.73
15T
27T
1.80
+3.7%
-3.7%
15T
28T
1.87
+7.1%
-7.1%
15T
29T
1.93
+10.3%
-10.3%
15T
30T
2.00
+13.3%
-13.3%
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