Measure around your head about one inch above the eyebrows and ears with a soft tape, then use the brand's size chart. Match the helmet's internal shape (round, intermediate or long oval) to your head. A new helmet should feel snug everywhere with cheek pads pressing your cheeks, no hot spots on the forehead, and it should not roll off when you push up on the back.
A certified helmet only protects you if it fits. Sizing takes five minutes.
Step 1: measure
Wrap a soft tape around your head about one inch above the eyebrows and ears, at the widest point. Measure twice and use the larger number in centimeters.
Step 2: head shape
| Shape | Head proportion | Typical sign of a mismatch |
|---|---|---|
| Round oval | Nearly as wide as long | Pressure on the sides of the forehead in most helmets |
| Intermediate oval | Slightly longer than wide | The most common; fits most helmets |
| Long oval | Noticeably longer than wide | Pressure on the forehead and back, gaps at the sides |
Brands state which shape their helmets suit.
Step 3: fit test
- Put the helmet on using the chin strap loops to spread it.
- Cheek pads should press your cheeks; your face should move slightly with the helmet when you move it.
- No gap at the brow; no pressure points on the forehead.
- Wear it for 15 to 20 minutes indoors. Red marks or a headache mean the shape is wrong.
- Fasten the strap and push up on the back. It must not roll forward.
Off-road and youth helmets
Off-road helmets fit the same way and should leave room for goggles. Youth helmets come in smaller shell sizes; never put a child in an adult helmet that is too large. See youth riders.
Check the certification with helmet standards explained, and add intercoms after you have the fit right.
Browse helmets.
Common questions
Should a new helmet be tight?
Snug, yes. Cheek pads compress with use, so a new helmet should feel firm on the cheeks. It should not cause pain or a headache within 15 to 20 minutes.
What if I am between sizes?
Try both. Many riders choose the smaller size if it is comfortable, because liners break in. Some brands offer different cheek pad thicknesses.
What is head shape?
The front-to-back versus side-to-side proportion of your head. Most riders are intermediate oval; helmets are built for one shape.
How do I check a helmet won't come off?
With the strap fastened, push up firmly on the back edge. The helmet should not roll forward over your eyes.