Bike and Gear info
PLEASE TALK TO YOUR TRACK OPERATORS BEFORE BUYING A BIKE!! We can help you find the right size and level of bike for your needs.
General bike information
Any standard BMX bike will do. So before you go investing $100's of dollars in a race bike, start off on what you have or something low cost. If you decide you like it and want to stay racing, then start looking or building that perfect race bike. Handlebars cannot exceed 30" in width. Handlebar grips are required & must be sufficient to fully cover & enclose all metal & openings on the handlebar ends.
You cannot have the following items on your bike for safety of the riders.
- Freestyle Pegs
- Kickstands
- Chain Guards
- Front Brakes (can simply be disconnected)
All riders must wear the following:
- Helmet (preferably full-faced) with a working strap
- Pants.
- Long sleeve shirt.
- Enclosed shoes
Is your bike set up properly?
Just like people are built different, bikes are built different too. Use the sizing charts on this page to help you make sure your bike is set up properly.
How do I know what size frame I should ride?
Use the chart below to help you decide what size frame you should be riding.
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Frame Sizing Chart |
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Frame Size |
Micro - Mini |
Mini |
Junior |
Expert |
Expert XL |
Pro |
Pro XL |
Pro XXL |
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Top Tube Lenght |
15"-16" |
16"-17.5" |
17.5"-18.5" |
18.5"-20" |
19"-20" |
20"-20.5" |
20.5"-21" |
21"-22" |
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Riders Height |
4'0" & under |
4'0"-4'4" |
4'3"-4'7" |
4'6"-5'5" |
5'2"-5'8" |
5'4" - 5'10" |
5'9"-6' |
6' & over |
|
Riders Weight |
40-65 lbs |
50-85 lbs |
60-100 lbs |
70-110 lbs |
75-125 lbs |
100 lbs & over |
140 lbs & over |
160 lbs & over |
| Riders approx Age | 4-6 | 5-7 | 7-9 | 9-11 | 11-12 | 13+ | ||
How do I know what size wheels I should ride?
Use the chart below to help you decide what size wheels you should be riding.
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Wheel Sizing Chart |
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Riders Age |
Under 5 |
5 to 10 |
9 to 12 |
12 to 14 |
14 to 19 |
19 & up |
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Riders Weight |
55lbs & below |
55-80lbs |
80-115lbs |
115-145lbs |
145-190lbs |
190lbs & up |
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Wheel Size |
18 x 1" |
20 x 1-1/8" |
20 x 1-3/8" |
20 x 1.50 |
20 x 1.75" |
20 x 2.00" |
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It is recommended riders who weigh 145lbs or more should run atleast a 20 x 1.75 tire on the front wheel. |
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How do I know what size cranks I should ride?
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Gearing info:
Since you can't always have a gear chart by your side. It's important to know how to calulate your gear ratio yourself. All you do is take the number of teeth on your chainring and divide it by the number of teeth on your freewheel, that gives you your gear ratio. For example, if your front sprocket is a 45 tooth, and your rear sprocket is a 16 tooth, then your gear ratio would be 2.8125 (45 divided by 16 = 2.8125). You then take that number (in this case 2.8125) and multiply it by 20 (the diameter of a BMX wheel). 2.8125 x 20 = 56.25 (the gear size). You can apply this simple formula to cruisers (BMX bikes with 24" wheels) by multiplying the gear ratio by 24 instead of 20.
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Gear Chart for 20" X 1.50" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
|
Rear 14 |
46.8 |
48.1 |
49.5 |
50.9 |
52.3 |
53.6 |
55.5 |
56.4 |
57.5 |
59.1 |
60.5 |
61.8 |
63.2 |
64.6 |
66.0 |
|
Rear 15 |
43.6 |
44.9 |
46.2 |
47.4 |
48.8 |
50.1 |
51.3 |
52.6 |
53.9 |
55.2 |
56.5 |
57.7 |
59.1 |
60.2 |
61.6 |
|
Rear 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 |
57.7 |
|
Rear 17 |
38.5 |
39.6 |
40.8 |
41.9 |
43.1 |
44.1 |
45.2 |
46.4 |
47.5 |
48.7 |
49.8 |
51.0 |
52.2 |
53.1 |
54.3 |
|
Rear 18 |
36.4 |
37.4 |
38.5 |
39.6 |
40.6 |
41.7 |
42.8 |
43.9 |
44.9 |
46.0 |
47.0 |
48.1 |
49.2 |
50.3 |
51.3 |
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Gear Chart for 20" X 1.75" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
|
Rear 14 |
47.4 |
48.7 |
50.2 |
51.6 |
53.0 |
54.4 |
55.7 |
57.1 |
58.5 |
59.9 |
61.3 |
62.7 |
64.1 |
65.5 |
66.9 |
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Rear 15 |
44.3 |
45.4 |
46.8 |
48.1 |
49.4 |
50.7 |
52.0 |
53.3 |
54.6 |
55.9 |
57.2 |
58.5 |
59.8 |
61.1 |
62.4 |
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Rear 16 |
41.5 |
42.7 |
43.9 |
45.1 |
46.3 |
47.5 |
48.8 |
50.0 |
51.2 |
52.4 |
53.7 |
54.9 |
56.1 |
57.3 |
58.5 |
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Rear 17 |
39.0 |
40.2 |
41.3 |
42.5 |
43.6 |
44.7 |
45.9 |
47.0 |
48.2 |
49.4 |
50.5 |
51.7 |
52.8 |
53.9 |
55.1 |
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Rear 18 |
36.8 |
37.8 |
39.0 |
40.1 |
41.2 |
42.3 |
43.3 |
44.4 |
45.5 |
46.6 |
47.7 |
48.8 |
49.9 |
51.0 |
52.0 |
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Gear Chart for 20" X 1 1/8" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
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Rear 14 |
48.6 |
50.0 |
51.4 |
52.8 |
54.3 |
55.7 |
57.7 |
58.6 |
60.0 |
61.4 |
62.8 |
64.3 |
65.7 |
67.1 |
68.6 |
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Rear 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 |
62.7 |
64.0 |
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Rear 16 |
42.5 |
43.8 |
45.5 |
46.2 |
47.5 |
48.7 |
50.0 |
51.2 |
52.5 |
53.7 |
55.0 |
56.2 |
57.5 |
58.7 |
60.0 |
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Rear 17 |
40.0 |
41.2 |
42.3 |
43.5 |
44.7 |
45.9 |
47.0 |
48.2 |
49.4 |
50.6 |
51.8 |
52.9 |
54.1 |
55.3 |
56.5 |
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Rear 18 |
37.7 |
38.8 |
40.0 |
41.1 |
42.2 |
43.3 |
44.4 |
45.6 |
46.7 |
47.8 |
48.9 |
50.0 |
51.1 |
52.2 |
53.3 |
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Gear Chart for 20" X 1 3/8" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
|
Rear 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 |
70.5 |
72.0 |
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Rear 15 |
47.6 |
49.0 |
50.0 |
51.8 |
53.2 |
54.6 |
56.0 |
57.4 |
58.8 |
60.2 |
61.6 |
63.0 |
64.4 |
65.8 |
67.2 |
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Rear 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 |
61.7 |
63.0 |
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Rear 17 |
42.0 |
43.2 |
44.5 |
45.7 |
47.0 |
48.2 |
49.4 |
50.7 |
51.9 |
53.2 |
54.4 |
55.6 |
56.9 |
58.1 |
59.3 |
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Rear 18 |
39.7 |
40.7 |
42.0 |
43.2 |
44.4 |
45.5 |
46.7 |
47.9 |
49.0 |
50.2 |
51.4 |
52.5 |
53.7 |
54.9 |
56.0 |
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Gear Chart for 24" X 1.50" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
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Rear 14 |
55.9 |
57.5 |
59.1 |
60.7 |
62.3 |
64.2 |
65.8 |
67.4 |
69.0 |
70.6 |
72.2 |
73.8 |
75.7 |
77.3 |
78.9 |
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Rear 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 |
72.0 |
73.6 |
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Rear 16 |
48.8 |
50.3 |
51.8 |
53.2 |
54.6 |
56.0 |
57.5 |
58.9 |
60.3 |
61.8 |
63.2 |
64.6 |
66.2 |
67.6 |
69.0 |
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Rear 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 |
63.5 |
64.8 |
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Rear 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 |
60.0 |
61.4 |
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Gear Chart for 24" X 1.75" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
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Rear 14 |
58.3 |
60.0 |
61.7 |
63.3 |
65.0 |
66.9 |
68.6 |
70.3 |
72.0 |
73.7 |
75.3 |
77.0 |
78.9 |
80.6 |
82.3 |
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Rear 15 |
54.4 |
56.0 |
57.6 |
59.3 |
60.7 |
62.4 |
64.1 |
65.5 |
67.2 |
68.9 |
70.3 |
72.0 |
73.7 |
75.1 |
76.8 |
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Rear 16 |
51.0 |
52.5 |
54.0 |
55.5 |
57.0 |
58.5 |
60.0 |
61.4 |
63.1 |
64.5 |
66.0 |
67.4 |
69.1 |
70.5 |
72.0 |
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Rear 17 |
48.0 |
49.4 |
50.8 |
52.2 |
53.6 |
55.1 |
56.5 |
57.9 |
59.3 |
60.7 |
62.1 |
63.6 |
65.0 |
66.2 |
67.7 |
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Rear 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 |
62.6 |
64.1 |
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Gear Chart for 24" X 1.1/8" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
|
Rear 14 |
54.9 |
56.5 |
58.1 |
59.7 |
61.3 |
63.1 |
64.7 |
66.3 |
67.9 |
69.4 |
71.0 |
72.6 |
74.4 |
76.0 |
77.5 |
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Rear 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 |
70.8 |
72.4 |
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Rear 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 |
66.5 |
67.9 |
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Rear 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 |
62.4 |
63.8 |
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Rear 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 |
59.0 |
60.4 |
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Gear Chart for 24" X 1.3/8" wheels |
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Chainwheel |
34 |
35 |
36 |
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
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Rear 14 |
58.3 |
60.0 |
61.7 |
63.3 |
65.0 |
66.9 |
68.6 |
70.3 |
72.0 |
73.7 |
75.3 |
77.0 |
78.9 |
80.6 |
82.3 |
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Rear 15 |
54.4 |
56.0 |
57.6 |
59.3 |
60.7 |
62.4 |
64.1 |
65.5 |
67.2 |
68.9 |
70.3 |
72.0 |
73.7 |
75.1 |
76.8 |
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Rear 16 |
51.1 |
52.5 |
54.0 |
55.5 |
57.0 |
58.5 |
60.0 |
61.4 |
63.1 |
64.5 |
66.6 |
67.4 |
69.1 |
70.5 |
72.0 |
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Rear 17 |
48.0 |
49.4 |
50.8 |
52.2 |
53.6 |
55.1 |
56.5 |
57.9 |
59.3 |
60.7 |
62.1 |
63.6 |
65.0 |
66.2 |
67.7 |
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Rear 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 |
62.6 |
64.1 |
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