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53 cm Head — Helmet Size
53 cm Head — Helmet Size — recommended helmet size with fit and safety guidance.
53 cm head: Size XS
53 cm (20.9 in) head circumference → size XS
An ill-fitting helmet doesn't protect properly — it should sit level and not rock. Size up if between, and replace after any impact.
Helmet size bands:
| Size | Head circumference |
|---|---|
| XS | 51–53 cm |
| S | 53–55 cm |
| M | 55–58 cm |
| L | 58–61 cm |
| XL | 61–64 cm |
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