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BMX Gear Ratio / Rollout Chart

Gear Ratio Chart/Rollout Chart
20 x 1-1/8 Wheels (with 20 x 1″ tires, 19.375″ inflated diameter)
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
73.2
10
65.9
67.8
69.8
71.7
73.6
11
59.9
61.6
63.4
65.2
66.9
68.7
70.5
72.2
12
54.9
56.5
58.1
59.7
61.4
63.0
64.6
66.2
67.8
69.4
71.0
72.7
FREE
13
50.7
52.2
53.7
55.1
56.6
58.1
59.6
61.1
62.6
64.1
65.6
67.1
68.6
70.0
71.5
73.0
WHEEL
14
47.1
48.4
49.8
51.2
52.6
54.0
55.4
56.7
58.1
59.5
60.9
62.3
63.7
63.8
66.4
67.8
69.2
70.6
15
43.9
45.2
46.5
47.8
49.1
50.4
51.7
53.0
54.3
55.5
56.8
58.1
59.4
60.7
62.0
63.3
64.6
65.9
16
41.2
42.4
43.6
44.8
46.0
47.2
48.4
49.6
50.9
52.1
53.3
54.5
55.7
56.9
58.1
59.3
60.5
60.6
17
41.0
42.2
43.3
44.4
45.6
46.7
47.9
49.0
50.1
51.3
52.4
53.6
54.7
55.8
57.0
58.1
18
40.9
42.0
43.1
44.1
45.2
46.3
47.4
48.4
49.5
50.6
51.7
52.7
53.8
54.9
20
39.0
40.7
41.7
42.6
43.6
44.6
45.5
46.5
47.5
48.4
49.4
20 x 1-1/8 Wheels (with 1-1/8 tires, 20.5″ inflated diameter)​
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
69.7
71.8
11
63.4
65.2
67.1
69.0
70.8
12
58.1
61.5
58.1
63.2
64.9
66.6
68.3
70.0
71.8
FREE
13
53.6
55.2
56.8
58.3
59.9
61.5
63.1
64.7
66.2
67.8
69.4
71.0
72.5
WHEEL
14
49.8
51.3
52.7
54.2
55.6
57.1
58.6
60.0
61.5
63.0
64.4
65.9
67.4
68.8
70.3
71.8
73.2
15
46.5
47.8
49.2
50.6
51.9
53.3
54.7
56.0
57.4
58.8
60.1
61.5
62.9
64.2
65.6
67.0
68.3
69.7
16
43.6
44.8
46.1
47.4
48.7
50.0
51.3
52.5
53.8
55.1
56.4
57.7
58.9
60.2
61.5
62.8
64.1
65.3
17
41.0
42.2
43.4
44.6
45.8
47.0
48.2
49.4
47.9
51.9
53.1
54.3
55.5
56.7
57.9
55.8
60.3
61.5
18
41.0
42.1
43.3
44.4
45.6
46.7
47.8
49.0
50.1
51.3
52.4
53.5
54.7
55.8
56.9
58.1
20
40.0
41.0
42.0
43.1
44.1
45.1
46.1
47.2
48.2
49.2
50.2
51.3
52.3
20 x 1-3/8 (with 1-3/8 tires, 21″ inflated diameter)
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
71.4
11
64.9
66.8
68.7
70.6
12
59.5
61.3
63.0
64.8
66.5
70.0
71.8
FREE
13
54.9
56.5
58.2
59.8
61.4
64.6
63.0
67.8
69.5
71.1
WHEEL
14
51.0
52.5
54.0
55.5
57.0
60.0
58.5
63.0
64.5
66.0
67.5
69.0
70.5
72.0
15
47.6
49.0
50.4
51.8
53.2
56.0
54.6
58.8
60.2
61.6
63.0
64.4
65.8
67.2
68.6
67.0
70.0
71.4
16
44.6
45.9
47.3
48.6
49.9
52.5
51.2
55.1
56.4
57.8
59.1
60.4
61.7
63.0
64.3
62.8
65.6
66.9
17
42.0
43.2
44.5
45.7
46.9
48.2
49.4
51.9
53.1
54.4
55.6
56.8
58.1
59.3
57.9
60.5
61.8
63.0
18
40.8
42.0
43.2
44.3
46.7
45.6
49.0
50.2
51.3
52.5
53.7
54.8
56.0
54.7
57.2
58.3
59.5
20
39.9
41.0
42.0
43.1
44.1
45.2
44.1
47.3
48.3
49.4
50.4
49.2
51.5
52.5
53.6
20 x 1.50 (19.25″ inflated diameter)​
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
65.5
67.4
69.3
11
59.5
61.3
63.0
64.8
66.5
68.3
70.0
12
54.5
56.1
57.8
59.4
61.0
62.6
64.2
65.8
67.4
69.0
70.6
FREE
13
50.3
51.8
53.3
54.8
56.3
57.8
59.2
60.7
62.2
63.7
65.2
66.6
68.1
69.6
71.1
WHEEL
14
46.8
48.1
49.5
50.9
52.3
53.6
55.0
56.4
57.8
59.1
60.5
61.9
63.3
64.6
66.0
67.4
68.8
70.1
15
43.6
44.9
46.2
47.5
48.8
50.1
51.3
52.6
53.9
55.2
56.5
57.8
59.0
60.3
61.6
62.9
64.2
65.5
16
40.9
42.1
43.3
44.5
45.7
46.9
48.1
49.3
50.5
51.7
52.9
54.1
55.3
56.5
57.8
59.0
60.2
61.4
17
39.6
40.8
41.9
43.0
44.2
45.3
46.4
47.6
48.7
49.8
51.0
52.1
53.2
54.4
55.5
56.6
57.8
18
39.6
40.6
41.7
42.8
43.8
44.9
46.0
47.1
48.1
49.2
50.3
51.3
52.4
53.5
54.5
20
39.5
40.4
41.4
42.4
43.3
44.3
45.2
46.2
47.2
48.1
49.1
20 x 1.75 (19.50″ inflated diameter)​
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
66.3
68.3
70.2
11
60.3
62.0
63.8
65.6
67.4
69.1
70.9
12
55.3
56.9
58.5
60.1
61.8
63.4
65.0
66.6
68.3
69.9
70.6
FREE
13
51.0
52.5
54.0
55.5
57.0
58.5
60.0
61.5
62.2
64.5
65.2
66.6
68.1
70.5
72.0
WHEEL
14
47.4
48.8
50.1
51.5
52.9
54.3
55.7
57.1
58.5
59.9
60.5
61.9
63.3
65.5
66.9
68.3
69.6
71.0
15
44.2
45.5
46.8
48.1
49.4
50.7
52.0
52.6
54.6
55.9
56.5
57.8
59.0
61.1
62.4
63.7
65.0
66.3
16
41.4
42.7
43.9
45.1
46.3
47.5
48.8
50.0
52.4
51.7
52.9
54.1
55.3
57.3
58.5
59.7
60.9
62.2
17
40.1
41.3
42.4
43.6
44.7
45.9
47.0
48.2
49.3
49.8
51.0
52.1
53.9
55.1
56.2
57.4
58.5
18
39.0
40.1
41.2
42.3
43.3
44.4
45.5
46.6
47.1
48.1
49.2
50.3
52.0
53.1
54.2
55.3
20
39.0
40.0
41.0
41.9
42.9
43.9
44.9
45.8
46.8
47.8
48.8
49.7
24 x 1-1/8 (520mm rims, 22.625″ inflated diameter)
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
11
69.9
72.0
12
64.1
66.0
67.9
69.8
71.6
FREE
13
59.2
60.9
62.7
64.4
66.1
67.9
69.6
71.4
WHEEL
14
54.9
56.6
58.2
59.8
61.4
63.0
64.6
66.3
67.9
69.5
71.1
15
51.3
52.8
54.3
55.8
57.3
58.8
60.3
61.8
63.4
64.9
66.4
67.9
69.4
70.9
16
48.1
49.5
50.9
52.3
53.7
55.1
56.6
58.0
59.4
60.8
62.2
63.6
65.0
66.5
67.9
69.3
70.7
72.1
17
45.3
46.6
47.9
49.2
50.6
51.9
53.2
54.6
55.9
57.2
58.6
59.9
61.2
62.6
63.9
65.2
66.5
67.9
18
42.7
44.0
45.3
46.5
47.8
49.0
50.3
51.5
52.8
54.0
55.3
56.6
57.8
59.1
60.3
61.6
60.8
64.1
20
39.6
40.7
41.9
43.0
44.1
45.5
46.4
47.5
48.6
49.8
50.9
52.0
53.2
54.3
55.4
56.6
57.7
24 x 1.50 (with 24 x 1.50 tires, 22.50″ inflated diameter)
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
11
69.5
12
63.8
65.6
67.5
69.4
71.3
FREE
13
58.8
60.6
62.3
64.0
65.8
67.5
69.2
71.0
WHEEL
14
54.6
56.3
57.9
59.5
61.1
62.7
64.3
65.9
67.5
69.1
70.7
15
51.0
52.5
54.0
55.5
57.0
58.5
60.0
61.5
63.0
64.5
66.0
67.5
69.0
70.5
16
47.8
49.5
50.6
52.0
53.4
54.8
56.3
57.7
59.1
60.5
61.9
63.3
64.7
66.1
67.5
68.9
70.3
17
45.0
46.3
47.6
49.0
50.3
51.6
52.9
54.3
55.6
56.9
58.2
59.6
60.9
62.2
63.5
64.9
66.2
67.5
18
42.5
43.8
45.0
46.3
47.5
48.8
50.0
51.3
52.5
53.8
55.0
56.3
57.5
58.8
60.0
61.3
62.5
63.8
20
39.4
40.5
41.6
42.8
43.9
45.0
46.1
47.3
48.4
49.5
50.6
51.8
52.9
54.0
55.1
56.3
57.4
24 x 1.50 (with 24 x 1.75 tires, 23″ inflated diameter)
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
11
71.1
12
65.2
67.1
69.0
70.9
FREE
13
60.2
61.9
63.7
65.5
67.2
69.0
70.8
WHEEL
14
55.9
57.5
59.1
60.8
62.4
64.1
65.7
67.4
69.0
70.6
15
52.1
53.7
55.2
56.7
59.8
59.8
61.3
62.9
64.4
65.9
67.5
69.0
70.5
16
48.9
50.3
51.8
53.2
56.0
56.1
57.5
58.9
60.4
61.8
63.3
64.7
66.1
67.6
69.0
70.4
17
46.0
47.4
48.7
50.1
51.4
52.8
54.1
55.55
56.8
58.2
59.5
60.9
62.2
63.6
64.9
66.3
67.6
69.0
18
43.4
44.7
46.0
47.3
48.6
49.8
51.1
52.4
53.7
54.9
56.2
57.5
58.8
60.1
61.3
62.6
63.9
65.2
20
 

39.1
40.3
41.4
42.6
43.7
44.9
46.0
47.2
48.3
49.5
50.6
51.8
52.9
54.1
55.2
56.4
57.5
58.7
24 x 1.75 w/24 x 1.75 tires or old 24 x 1-3/8 Tires on 520mm rims(24″ inflated diameter)
Gear
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
9
10
11
12
68.0
70.0
FREE
13
62.8
64.6
66.5
68.3
70.0
WHEEL
14
58.3
60.0
61.7
63.4
65.1
66.9
68.6
70.3
15
54.4
56.0
57.6
59.2
60.8
62.4
64.0
65.6
67.2
68.8
70.4
16
51.0
52.5
54.0
55.5
57.0
58.5
60.0
61.5
63.0
64.5
66.0
67.5
69.0
70.5
17
48.0
49.4
50.8
52.2
53.6
55.1
56.5
57.9
59.3
60.7
62.1
63.5
64.9
66.4
67.8
69.2
70.6
18
45.3
46.7
48.0
49.3
50.7
52.0
53.3
54.7
56.0
57.3
58.7
60.0
61.3
62.7
64.0
64.0
66.7
68.0
20
40.8
42.0
43.2
44.4
45.6
46.8
48.0
49.2
50.4
51.6
52.8
54.0
55.2
56.4
57.6
57.6
60.0
61.2