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Winnebagoland BMX
500 E CTY Y
Oshkosh, WI 54901
920-277-3691
Bike Tech
This page is dedicated to helping parents & racers in their quest for the best information on bikes and gears...
Bike Sizing
Wheel Sizing
Crank Sizing
Gear Charts
What Bike Size You Should Ride?
Here is a chart to help guide you.
| BMX RIDER BIKE SIZING | |||||||
| Rider Height |
Frame Size |
Top Tube Length |
Stem Length |
Bar Rise |
Bar Width |
Crank Length |
Gearing |
| 4'0" & under | Micro-Mini | 15"- 15.5" | Mini | 2"-2.5" | 20"- 21.5" | See Chart Below |
See Chart Below |
| 4'0"-4'6" | Mini | 15.5"- 16.5" | Mini Mini XL |
2"-3.5" | 21"- 23" | See Chart Below |
See Chart Below |
| 4'4"-4'10" | Junior | 16"- 17.5" | Mini Mini XL |
3"-4.5" | 22"- 24.5" | See Chart Below |
See Chart Below |
| 4'8"-5'4" | Expert | 17"- 18.5" | Pro | 4.5"-6" | 24"- 26" | See Chart Below |
See Chart Below |
| 5'2"-5'8" | Expert XL | 18"-19" | Pro | 6"-7.5" | 26"- 27" | See Chart Below |
See Chart Below |
| 5'6" - 5'10" | Pro | 18.5"- 19.5" | Pro Pro XL |
7"-8" | 27"- 28" | See Chart Below |
See Chart Below |
| 5'10"-6'1" | Pro XL | 19"-21" | Pro Pro XL |
7"-8" | 17"- 28" | See Chart Below |
See Chart Below |
| 6' & over | Pro XXL | 20.5" & over | Pro XL Pro XXL |
7"-8" | 28"- ?" | See Chart Below |
See Chart Below |
What is the Correct Wheel Size?
| WHEEL SIZES | |
|
Maximum Rider Weight |
Rim Width |
| 0 – 85# | Sew Ups |
| 86 – 100 | 20 x 1-1/8" |
| 101 – 120 | 20 x 1-3/8" |
| 121 – 150 | 20 x 1.50" |
| 151 – 200 | 20 x 1.75" |
What Crank Size Do You Need?
| CRANK SIZING CHART | |||||||
| Riders Inseam | 20" | 21" | 22" | 23" | 24" | 25" | 26" |
| Crank Length | 140mm | 145mm | 150mm | 155mm | 160mm | 162mm | 166mm |
| Riders Inseam | 27" | 28" | 29" | 30" | 31" | 32" | 34" |
| Crank Length | 171mm | 175mm | 177mm | 180mm | 182mm | 185mm | 190mm |
What Gear Should You Run?
Most riders, regardless of class, seem to prefer a rotation of approximately 53."
To figure your rotation here is the formula.
** Sprocket divided by Freewheel times Tire diameter **
| 20" X 1.75" Gear Chart | 20" X 1.50" Gear Chart |
| 20" X 1.3/8" Gear Chart | 20" X 1.1/8" Gear Chart |
| 24" X 1.75" Gear Chart | 24" X 1.50" Gear Chart |
| 24" X 1.3/8" Gear Chart | 24" X 1.1/8" Gear Chart |
| 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. |
| 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. |
| 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 |
|
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