BMX Gear Charts
BMX Gear Charts
Most Pro BMXers Run Approximately 54 gear inches
44/16 gear ratio with 20x1.75 tire is the most commonly used combination in BMX
For Exact Gear Measurement... Divide Front Gear by Rear Gear and Multiply by Tire Diameter
Example: 44/16 = 2.75 x 19.5 = 53.625 gear inches (20x1.75 tire)
These charts are for general reference - actual tire diameter varies from brand to brand
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20" X 1.75" GEAR CHART (approx. 19.5" tire diameter) = suitable for any size rider |
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CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 14 |
47.4 |
48.7 |
50.2 |
51.6 |
53.0 |
54.4 |
55.7 |
57.1 |
58.5 |
59.9 |
61.9 |
62.7 |
64.1 |
|
Freewheel 15 |
44.2 |
45.5 |
46.8 |
48.1 |
49.4 |
50.7 |
52.0 |
53.3 |
54.6 |
55.9 |
57.2 |
58.5 |
59.8 |
|
Freewheel 16 |
41.4 |
42.7 |
43.9 |
45.1 |
46.3 |
47.5 |
48.8 |
50.0 |
51.2 |
52.4 |
53.6 |
54.9 |
56.1 |
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20" X 1.50" GEAR CHART (approx. 19" tire diameter) = typically for riders under 150lbs |
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CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 14 |
46.8 |
48.1 |
49.5 |
50.9 |
52.3 |
53.6 |
55.0 |
56.4 |
57.5 |
59.1 |
60.5 |
61.8 |
63.2 |
|
Freewheel 15 |
43.6 |
44.9 |
46.2 |
47.4 |
48.8 |
50.1 |
51.3 |
52.8 |
53.9 |
55.2 |
56.5 |
57.7 |
59.1 |
|
Freewheel 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 |
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20" X 1 3/8"(1.375") GEAR CHART (approx. 21" tire diameter) = typically for riders under 120lbs |
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CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 14 |
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 |
|
Freewheel 15 |
47.6 |
49.0 |
50.4 |
51.6 |
53.2 |
54.6 |
56.0 |
57.4 |
58.8 |
60.2 |
61.6 |
63.0 |
64.4 |
|
Freewheel 16 |
44.6 |
45.9 |
47.3 |
48.6 |
49.9 |
51.2 |
52.5 |
53.9 |
55.2 |
56.5 |
57.8 |
59.1 |
60.4 |
|
20" X 1 1/8"(1.125") GEAR CHART (approx. 20" tire diameter ) = typically for riders under 80lbs |
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CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 14 |
48.6 |
50.0 |
51.4 |
52.8 |
54.3 |
55.7 |
57.1 |
58.6 |
60.0 |
61.4 |
62.8 |
64.3 |
65.7 |
|
Freewheel 15 |
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 |
|
Freewheel 16 |
42.5 |
43.8 |
45.0 |
46.2 |
47.5 |
48.7 |
50.0 |
51.2 |
52.5 |
53.7 |
55.0 |
56.2 |
57.5 |
|
24" X 1.75" GEAR CHART (approx. 23.5" tire diameter) = suitable for any size rider |
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CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 15 |
53.2 |
54.8 |
56.4 |
58.0 |
59.5 |
61.1 |
62.6 |
|
|
|
|
|
|
|
Freewheel 16 |
49.9 |
51.4 |
52.8 |
54.3 |
55.8 |
57.3 |
58.5 |
60.2 |
61.6 |
63.1 |
|
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|
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Freewheel 17 |
47.0 |
48.4 |
49.7 |
51.1 |
52.5 |
54.0 |
55.3 |
56.6 |
58.2 |
59.4 |
60.8 |
62.2 |
|
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Freewheel 18 |
|
|
|
48.3 |
49.6 |
50.9 |
52.2 |
53.5 |
54.8 |
56.1 |
57.4 |
58.7 |
60.0 |
|
24" X 1.50" GEAR CHART (approx. 23" tire diameter) = typically for riders under 150lbs |
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|
CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 15 |
52.1 |
53.7 |
55.2 |
56.7 |
58.2 |
59.8 |
61.3 |
62.8 |
64.4 |
65.9 |
67.4 |
69.0 |
70.6 |
|
Freewheel 16 |
48.4 |
50.3 |
51.8 |
53.2 |
54.6 |
56.0 |
57.5 |
58.9 |
60.3 |
61.8 |
63.2 |
64.6 |
66.2 |
|
Freewheel 17 |
46.0 |
47.3 |
48.7 |
50.0 |
51.4 |
52.8 |
54.1 |
55.5 |
56.8 |
58.8 |
59.5 |
60.8 |
62.3 |
|
Freewheel 18 |
43.4 |
44.7 |
46.0 |
47.2 |
48.5 |
49.8 |
51.1 |
52.4 |
53.7 |
54.9 |
56.2 |
57.5 |
58.9 |
|
24" X 1 3/8"(1.375") GEAR CHART (approx. 24" tire diameter) = typically for riders under 120lbs |
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|
CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 15 |
54.4 |
56.0 |
57.6 |
59.3 |
60.7 |
62.4 |
64.1 |
65.5 |
67.2 |
68.9 |
71.3 |
72.0 |
73.7 |
|
Freewheel 16 |
51.1 |
52.5 |
54.0 |
55.5 |
57.0 |
58.5 |
60.0 |
61.4 |
63.1 |
64.5 |
66.0 |
67.4 |
69.1 |
|
Freewheel 17 |
48.0 |
49.4 |
50.8 |
52.2 |
53.6 |
55.1 |
56.5 |
57.9 |
59.3 |
60.7 |
62.1 |
63.3 |
65.0 |
|
Freewheel 18 |
45.3 |
46.5 |
48.0 |
49.4 |
50.7 |
52.0 |
53.3 |
54.7 |
56.0 |
57.3 |
58.5 |
60.0 |
61.4 |
|
24" X 1 1/8"(1.125") GEAR CHART (approx. 22.6" tire diameter) = typically riders under 80lbs |
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|
CHAIN WHEELS |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
|
Freewheel 15 |
51.3 |
52.8 |
54.3 |
55.8 |
57.3 |
58.8 |
60.3 |
61.8 |
63.3 |
64.9 |
66.3 |
67.9 |
69.4 |
|
Freewheel 16 |
48.1 |
49.5 |
50.9 |
52.3 |
53.7 |
55.1 |
56.6 |
57.9 |
59.5 |
60.8 |
62.2 |
63.9 |
65.1 |
|
Freewheel 17 |
45.2 |
46.6 |
47.9 |
49.3 |
50.6 |
51.9 |
53.2 |
54.6 |
55.9 |
57.2 |
58.6 |
59.9 |
61.3 |
|
Freewheel 18 |
42.7 |
43.9 |
45.2 |
46.6 |
47.7 |
49.1 |
50.3 |
51.5 |
52.8 |
54.0 |
55.3 |
56.6 |
57.9 |
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