How do you know what bike size you should ride? Here is a chart to help guide you.
BMX 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 Calculator Below
4’0″-4’6″
Mini
15.5″- 16.5″
Mini Mini XL
2″-3.5″
21″- 23″
See Chart Below
See Calculator Below
4’4″-4’10″
Junior
16″- 17.5″
Mini Mini XL
3″-4.5″
22″- 24.5″
See Chart Below
See Calculator Below
4’8″-5’4″
Expert
17″- 18.5″
Pro
4.5″-6″
24″- 26″
See Chart Below
See Calculator Below
5’2″-5’8″
Expert XL
18″-19″
Pro
6″-7.5″
26″- 27″
See Chart Below
See Calculator Below
5’6″ – 5’10″
Pro
18.5″- 19.5″
Pro Pro XL
7″-8″
27″- 28″
See Chart Below
See Calculator Below
5’10″-6’1″
Pro XL
19″-21″
Pro Pro XL
7″-8″
17″- 28″
See Chart Below
See Calculator Below
6′ & over
Pro XXL
20.5″ & over
Pro XL Pro XXL
7″-8″
28″- ?”
See Chart Below
See Calculator Below
Wheel Sizes
Max Rider Weight
Rim Width
0 – 85 lbs
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″
Crank Sizing
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
Gearing
What Gear Should You Run? Most riders regardless of class seem to prefer a roll-out of approximately 53″ – 54″. To figure your roll-out here is the formula:
** Sprocket divided by Freewheel times Tire Diameter **
