Bike Gear Size Chart

Gear Charts

20" X 1.75" Gear Chart
Sprocket	34	35	36	37	38	39	40	41
Freewheel 14	47.4	48.7	50.2	51.6	53.0	54.4	55.7	57.1
Freewheel 15	44.3	45.4	46.0	48.1	49.4	50.7	52.0	53.3
Freewheel 16	41.5	42.7	43.9	45.1	46.3	47.5	48.8	50.0
Freewheel 17	39.0	40.2	41.3	42.5	43.6	44.7	45.9	47.0
Freewheel 18	36.8	37.8	39.0	40.1	41.2	42.3	43.3	44.4

Sprocket	42	43	44	45	46	47	48
Freewheel 14	58.5	59.9	61.9	62.7	64.1	65.5	66.9
Freewheel 15	54.6	55.9	57.2	58.5	59.8	61.1	62.4
Freewheel 16	51.2	52.4	53.7	54.9	56.1	57.3	58.5
Freewheel 17	48.2	49.4	50.5	51.7	52.8	53.9	55.1
Freewheel 18	45.5	46.6	47.7	48.8	49.9	51.0	52.0

20" X 1.50" Gear Chart
Sprocket
34
35
36
37
38
39
40
41
Freewheel 14
46.8
48.1
49.5
50.9
52.3
53.6
55.0
56.4
Freewheel 15
43.6
44.9
46.2
47.4
48.8
50.1
51.3
52.8
Freewheel 16
40.9
42.1
43.3
44.5
45.7
46.9
48.1
49.3
Freewheel 17
38.5
39.6
40.8
41.9
43.1
44.1
45.2
46.4
Freewheel 18
36.4
37.4
38.5
39.6
40.6
41.7
42.8
43.9

Sprocket
42
43
44
45
46
47
48

Freewheel 14
57.5
59.1
60.5
61.8
63.2
64.6
66.0
Freewheel 15
53.9
55.2
56.5
57.7
59.1
60.2
61.6
Freewheel 16
50.5
51.7
52.9
54.1
55.3
56.5
57.7
Freewheel 17
47.5
48.7
49.8
51.0
52.2
53.1
54.3
Freewheel 18
44.9
46.0
47.0
48.1
49.2
50.3
51.3

20" X 1.3/8" Gear Chart
Sprocket
34
35
36
37
38
39
40
41
Freewheel 14
51.0
52.5
54.0
55.5
57.0
58.5
60.0
61.5
Freewheel 15
47.6
49.0
50.4
51.6
53.2
54.6
56.0
57.4
Freewheel 16
44.6
45.9
47.3
48.6
49.9
51.2
52.5
53.9
Freewheel 17
42.0
43.2
44.5
45.7
47.0
48.2
49.4
50.7
Freewheel 18
39.7
40.7
42.0
43.2
44.4
45.5
46.7
47.9
Sprocket
42
43
44
45
46
47
48
Freewheel 14
63.0
64.5
66.0
67.5
69.0
70.5
72.0
Freewheel 15
58.8
60.2
61.6
63.0
64.4
65.8
67.2
Freewheel 16
55.2
56.5
57.8
59.1
60.4
61.7
63.0
Freewheel 17
51.9
53.2
54.4
55.6
56.9
58.1
59.3
Freewheel 18
49.0
50.2
51.4
52.5
53.7
54.9
56.0

20" X 1.1/8" Gear Chart
Sprocket
34 35 36 37 38 39 40 41
Freewheel 14
48.6
50.0
51.4
52.8
54.3
55.7
57.1
58.6
Freewheel 15
45.3
46.7
48.0
49.3
50.7
52.0
53.3
54.7
Freewheel 16
42.5
43.8
45.0
46.2
47.5
48.7
50.0
51.2
Freewheel 17
40.0
41.2
42.3
43.5
44.7
45.9
47.0
48.2
Freewheel 18
37.7
38.8
40.0
41.1
42.2
43.3
44.4
45.6

Sprocket
42 43 44 45 46 47 48
Freewheel 14
60.0
61.4
62.8
64.3
65.7
67.1
68.6
Freewheel 15
56.0
57.3
58.7
60.0
61.3
62.7
64.0
Freewheel 16
52.5
53.7
55.0
56.2
57.5
58.7
60.0
Freewheel 17
49.4
50.6
51.8
52.9
54.1
55.3
56.5
Freewheel 18
46.7
47.8
48.9
50.0
51.1
52.2
53.3

24" X 1.75" Gear Chart

Sprocket
34
35
36
37
38
39
40
41
Freewheel 14
58.3
60.0
61.7
63.3
65.0
66.9
68.6
70.3
Freewheel 15
54.4
56.0
57.6
59.3
60.7
62.4
64.1
65.5
Freewheel 16
51.0
52.5
54.0
55.5
57.0
58.5
60.0
61.4
Freewheel 17
48.0
49.4
50.0
52.2
53.6
55.1
56.5
57.9
Freewheel 18
45.3
46.5
48.0
49.4
50.7
52.0
53.3
54.7

Sprocket
42
43
44
45
46
47
48

Freewheel 14
72.0
73.7
75.3
77.0
78.9
80.6
82.3
Freewheel 15
67.2
68.9
70.3
72.0
73.7
75.1
76.8
Freewheel 16
63.1
64.5
66.0
67.4
69.1
70.5
72.0
Freewheel 17
59.3
60.7
62.1
63.6
65.0
66.2
67.7
Freewheel 18
56.0
57.3
58.5
60.0
61.4
62.6
64.1

24" X 1.50" Gear Chart

Sprocket
34
35
36
37
38
39
40
41
Freewheel 14
55.9
57.5
59.1
60.7
62.3
64.2
65.8
67.4
Freewheel 15
52.1
53.7
55.2
56.7
58.2
59.8
61.3
62.8
Freewheel 16
48.4
50.3
51.8
53.2
54.6
56.0
57.5
58.9
Freewheel 17
46.0
47.3
48.7
50.0
51.4
52.8
54.1
55.5
Freewheel 18
43.4
44.7
46.0
47.2
48.5
49.8
51.1
52.4

Sprocket
42
43
44
45
46
47
48

Freewheel 14
69.0
70.6
72.2
73.8
75.7
77.3
78.9
Freewheel 15
64.4
65.9
67.4
69.0
70.6
72.0
73.6
Freewheel 16
60.3
61.8
63.2
64.6
66.2
67.6
69.0
Freewheel 17
56.8
58.8
59.5
60.8
62.3
63.5
64.8
Freewheel 18
53.7
54.9
56.2
57.5
58.9
60.0
61.4

24" X 1.3/8" Gear Chart
Sprocket
34
35
36
37
38
39
40
41
Freewheel 14
58.3
60.0
61.7
63.3
65.0
66.9
68.6
70.3
Freewheel 15
54.4
56.0
57.6
59.3
60.7
62.4
64.1
65.5
Freewheel 16
51.1
52.5
54.0
55.5
57.0
58.5
60.0
61.4
Freewheel 17
48.0
49.4
50.8
52.2
53.6
55.1
56.5
57.9
Freewheel 18
45.3
46.5
48.0
49.4
50.7
52.0
53.3
54.7

Sprocket
42
43
44
45
46
47
48

Freewheel 14
72.0
73.7
75.3
77.0
78.9
80.6
82.3
Freewheel 15
67.2
68.9
71.3
72.0
73.7
75.1
76.8
Freewheel 16
63.1
64.5
66.0
67.4
69.1
70.5
72.0
Freewheel 17
59.3
60.7
62.1
63.3
65.0
66.2
67.7
Freewheel 18
56.0
57.3
58.5
60.0
61.4
62.6
64.1

24" X 1.1/8" Gear Chart
Sprocket
34
35
36
37
38
39
40
41
Freewheel 14
54.9
56.5
58.1
59.7
61.3
63.1
64.7
66.3
Freewheel 15
51.3
52.8
54.3
55.8
57.3
58.8
60.3
61.8
Freewheel 16
48.1
49.5
50.9
52.3
53.7
55.1
56.6
57.9
Freewheel 17
45.2
46.6
47.9
49.3
50.6
51.9
53.2
54.6
Freewheel 18
42.7
43.9
45.2
46.6
47.7
49.1
50.3
51.5

Sprocket
42
43
44
45
46
47
48

Freewheel 14
67.9
69.4
71.0
72.6
74.4
76.0
77.6
Freewheel 15
63.3
64.9
66.3
67.9
69.4
70.8
72.4
Freewheel 16
59.5
60.8
62.2
63.9
65.1
66.5
67.9
Freewheel 17
55.9
57.2
58.6
59.9
61.3
62.4
63.8
Freewheel 18
52.8
54.0
55.3
56.6
57.9
59.0
60.4