BMX Bike Sizing Info Page
When sizing yourself on a bike, your knees should not be able to hit the handlebars while standing with both feet flat on the pedals.
Bike Size |
general age group |
weight/height |
Top Tube inches |
Crank mm |
stem |
Handlebar inches |
MINI |
3 - 6 |
40-65 lbs & 3'10"- 4'8" |
16-17.5 |
145-155 |
mini |
2-2.5" |
JUNIOR |
6 - 11 |
60-75 lbs & 4'4"- 4'9" |
17.5-18.5 |
155-165 |
mini-
mini xl |
4-5.5" |
EXPERT |
8 - 14 |
75-100 lbs & 4'6"- 5'2" |
19.25-20 |
165-170 |
expert to pro |
5-6.5" |
EXPERT XL |
10 - 14 |
75-110 lbs & 4'10"- 5'4" |
19.5-20 |
170-175 |
expert to pro |
6-7.25" |
JR. PRO |
12 - 16 |
100+ lbs & 5'5"- 5'8" |
20-20.5 |
175-180 |
pro |
7-8" |
PRO XL |
small adult size |
140+ lbs & 5'8"-6'0" |
21-21.5 |
180-182 |
pro or proXL |
7.5-8" |
PRO |
adult size |
150+ lbs 5'10" & over |
biggest |
|
|
|
PRO XXL |
large adult size |
160+ lbs & 5'10" & over |
21.5-22 |
180-185 |
pro XL or pro XXL |
8-8.5" |
To get a good estimate of what size crank arm you should be using see chart below:
Inseam of leg (measure from floor to crotch) |
Crank Arm in Milimeter size mm |
15 - 16 inch |
135 mm |
16 - 17.5 inch |
140 mm |
17.5 - 19 inch |
145mm |
19 - 20 inch |
150 mm |
20 - 22 inch |
155 mm |
22 - 23 inch |
160 mm |
23 - 25 inch |
165 mm |
25 - 26 inch |
170 mm |
26 - 28 inch |
175 mm |
28 - 29 inch |
177 mm |
29 - 31 inch |
180 mm |
31 - 33 inch |
182 mm |
33 inch and over |
185 mm |
The above specifications are generic, it does not mean you have to ride a certain size bike if you fall into any particular categor. The charts are to give you a basic guideline to determining appropriate sizes.
It is important that you feel comfortable on your bike.
Cruiser – This is a different type of bike and class, and you can use the above specifications, since there is jr-cruiser, expert-cruiser, etc.
Please see the gear chart page to see if you are riding on appropriate ratios.
