If your your head circumference is 50 to 54 cm head, go with a Small (kids / small adult). Bike helmets are sized by head circumference. A correct helmet sits level, two finger widths above your eyebrows, and does not rock when you shake your head.
Full bike helmet size chart
How to measure
- Wrap a soft tape around your head about 2 cm above the eyebrows.
- Keep the tape level all the way around.
- Match the cm to the brand size band.
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Compare top-rated bike helmet in Small (kids / small adult) from trusted retailers.
Shop bike helmet →What changes your size
| Between sizes | Size down if the dial retention system can expand to fit. |
| Thick hair | Measure with hair as you normally wear it. |
FAQ
- What size bike helmet for 50 to 54 cm head?
- For your head circumference of 50 to 54 cm head, the recommended bike helmet size is Small (kids / small adult).
- How should a bike helmet fit?
- Snug and level, about two finger widths above the eyebrows, with no rocking. Tighten the dial so it stays put before you buckle the strap.