Motorcycle Sprocket Size/Ratio Calculator
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Honda XR250R (1986-1995)
Front
Rear
Chain
Links
Honda XR250R (1986-1995)
13
48
520
108
Select current size of front and rear sprockets
as well as the new sizes.
FRONT
REAR
LINKS
CURRENT
5
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
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
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
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
8
9
10
11
12
13
14
15
16
17
18
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
65
66
67
68
112
Link count is approximate.
Make sure chain is long enough before you cut it.
Front
Rear
Ratio
Torque
Speed
13T
46T
3.54
-4.3%
+4.3%
13T
47T
3.62
-2.1%
+2.1%
13T
48T
3.69
13T
49T
3.77
+2.0%
-2.0%
13T
50T
3.85
+4.0%
-4.0%
13T
51T
3.92
+5.9%
-5.9%
13T
52T
4.00
+7.7%
-7.7%
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