How to Choose a Dirt Bike Helmet: DOT Label, Size and Fit
How to choose a dirt bike helmet: measure above the eyebrows, read the DOT and FMVSS No. 218 label, check NHTSA's fit tests and know your head shape.
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Choose a dirt bike helmet in three steps: measure your head just above the eyebrows, buy a helmet whose label shows DOT and FMVSS No. 218, and check that it feels a little tight with even pressure and does not move when you shake your head. All three come from NHTSA's helmet guide.
The same checks apply to kids and adults, gas and electric bikes. Coleman's CT200U manual calls for a DOT certified helmet on its mini bike.
1. Measure your head
NHTSA says to wrap a cloth tape just above the eyebrows, around the largest part of the head. Use the number in centimeters to match a maker's chart.
| Helmet chart | Size | Head |
|---|---|---|
| QSTK | XS | 48 to 50 cm |
| QSTK | M | 53 to 54 cm |
| TRIANGLE | S | 55 to 56 cm |
| TRIANGLE | L | 59 to 60 cm |
| TRIANGLE | XL | 61 to 62 cm |
2. Know your head shape
NHTSA describes three head shapes: round oval, intermediate oval (the most common) and long oval. A helmet shaped for a different head can press on the forehead or sides even in the right size.
3. Read the label
NHTSA says the DOT symbol on the back of a helmet means the maker certifies it meets FMVSS No. 218. The label should show the manufacturer or brand, the model, DOT, FMVSS No. 218 and CERTIFIED; helmets made before May 13, 2013 may read only DOT. NHTSA does not approve helmets: makers self-certify, and NHTSA tests some and can order recalls.
4. Test the fit
- Put the helmet on and fasten the strap.
- It should feel a little tight, with even pressure all around and no pressure points.
- Shake your head side to side and up and down: the helmet should not move on its own.
- Wear it for several minutes indoors before riding; a hot spot that builds is a sign of the wrong shape.
Kids' helmets
Fit a child's helmet now, not for growth. Youth sizes start lower: QSTK lists XS at 48 to 50 cm (per the Amazon listing). Youth riders also need eye protection, gloves, boots and long sleeves and pants.
Where to go next
Picks with these labels and charts: the best dirt bike helmets. Pair with goggles that fit the eye port. The full gear list is in the mini bike safety guide.
Frequently asked questions
How do I measure for a dirt bike helmet?
Wrap a cloth tape just above the eyebrows around the largest part of your head, per NHTSA, and match the centimeter figure to the maker's chart.
How tight should a dirt bike helmet be?
NHTSA describes a correctly sized helmet as a little tight, with even pressure and no pressure points, that stays put when you shake your head.
What should a DOT helmet label say?
NHTSA says it should show the manufacturer or brand, the model, DOT, FMVSS No. 218 and CERTIFIED. Older helmets made before May 13, 2013 may show only DOT.
Does NHTSA approve helmets?
No. Makers self-certify to FMVSS No. 218; NHTSA tests some helmets and can order recalls of those that fail.
What head shapes are there for helmets?
NHTSA describes round oval, intermediate oval (the most common) and long oval. Pick a helmet shaped for your head to avoid pressure points.
Can a kid wear an adult small helmet?
Only if it fits by NHTSA's tests. Many youth heads need an XS like QSTK's 48 to 50 cm; never buy a size up for growth.
Sources
- Choose the Right Motorcycle Helmet, National Highway Traffic Safety Administration
- Coleman Powersports CT200U Owner's Manual, Coleman Powersports
Cover image: Illustration: Mini Bike Review (AI-generated)
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