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Most Pro BMX'rs Run Approximately 54 gear inches ( this is the high-lighted area in each chart)

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)

 

 

 

20" X 1.75" GEAR CHART (19.5" tire diameter) = any size rider
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1447.448.750.251.653.054.455.757.158.559.961.962.764.1
Rear 1544.245.546.848.149.450.752.053.354.655.957.258.559.8
Rear 1641.442.743.945.146.347.548.850.051.252.453.654.956.1

 

 

20" X 1.50" GEAR CHART (19" tire diameter) = riders under 150lbs
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1446.848.149.550.952.353.655.056.457.559.160.561.863.2
Rear 1543.644.946.247.448.850.151.352.853.955.256.557.759.1
Rear 1640.942.143.344.545.746.948.149.350.551.752.954.155.3

 

 

20" X 1.375"(1 3/8) GEAR CHART (21" tire diameter) = riders under 120lbs
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1451.052.554.055.557.058.560.061.563.064.566.067.569.0
Rear 1547.649.050.451.653.254.656.057.458.860.261.663.064.4
Rear 1644.645.947.348.649.951.252.553.955.256.557.859.160.4

 

 

20" X 1.125"(1 1/8) GEAR CHART (20" tire diameter ) = riders under 80lbs
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1448.650.051.452.854.355.757.158.660.061.462.864.365.7
Rear 1545.346.748.049.350.752.053.354.756.057.358.760.061.3
Rear 1642.543.845.046.247.548.750.051.252.553.755.056.257.5

 

 

24" X 1.75" GEAR CHART (23.5" tire diameter) = any size rider
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1553.254.856.458.059.561.162.6      
Rear 1649.951.452.854.355.857.358.560.261.663.1   
Rear 1747.048.449.751.152.554.055.356.658.259.460.862.2 
Rear 18   48.349.650.952.253.554.856.157.458.760.0

 

 

24" X 1.50" GEAR CHART (23" tire diameter) = riders under 150lbs
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1552.153.755.256.758.259.861.362.864.465.967.469.070.6
Rear 1648.450.351.853.254.656.057.558.960.361.863.264.666.2
Rear 1746.047.348.750.051.452.854.155.556.858.859.560.862.3
Rear 1843.444.746.047.248.549.851.152.453.754.956.257.558.9

 

 

24" X 1.375" (1 3/8") GEAR CHART (24" tire diameter) = riders under 120lbs
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1554.456.057.659.360.762.464.165.567.268.971.372.073.7
Rear 1651.152.554.055.557.058.560.061.463.164.566.067.469.1
Rear 1748.049.450.852.253.655.156.557.959.360.762.163.365.0
Rear 1845.346.548.049.450.752.053.354.756.057.358.560.061.4

 

 

24" X 1.125" (1 1/8") GEAR CHART (22.6" tire diameter) = riders under 80lbs
CHAIN WHEELS
34
35
36
37
38
39
40
41
42
43
44
45
46
Rear Gear 1551.352.854.355.857.358.860.361.863.364.966.367.969.4
Rear 1648.149.550.952.353.755.156.657.959.560.862.263.965.1
Rear 1745.246.647.949.350.651.953.254.655.957.258.659.961.3
Rear 1842.743.945.246.647.749.150.351.552.854.055.356.657.9