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Sizing chart for the GT2i Helmets:
| Head circumference (cm) | Size |
| 53 | XS |
| 55 | S |
| 57 | M |
| 59 | L |
| 60 | L/XL |
| 61 | XL |
| 63 | XXL |
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GT2i Pro / Club Helmet Sizing Chart