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HJC i 100 Flip-Up Helmet - White
(Product No.: BB-107H320.13)
HJC i 100 Flip-Up Helmet - White
The i100 brings variety to the everyday life of a modular helmet. This modular helmet features a fully rotating chin bar that can be used in both open and full-face configurations thanks to P/J dual homologation. An easy-to-use integrated sun visor (Dark Smoke) is cable operated and is located on the lower left side of the shell. This shell is made from our advanced polycarbonate material and is offered in 3 shells ranging in size from XS to 2XL for maximum comfort and fit. It's also designed and engineered with optimal balance and weight distribution for all-day riding comfort. This helmet is also suitable for the SMART HJC Bluetooth systems (10B and 20B).Find more products here
HJC Size Chart
HJC offers motorcycle helmets and bicycle helmets with partly different size ranges. The categories are therefore listed separately. Individual models may differ from the general reference chart; product-specific sizing always takes priority.
Motorcycle helmets – general HJC reference chart
Measure the head circumference with a flexible measuring tape around the head. For motorcycle helmets, HJC recommends measuring approximately 2.5 cm above the eyebrows.
| Size | Head circumference (cm) | Hat size | Head circumference (inches) |
|---|---|---|---|
| 3XS* | 50–51 | 6 1/4 – 6 3/8 | 19 3/4 – 20 1/8 |
| 2XS | 52–53 | 6 1/2 – 6 5/8 | 20 1/2 – 20 7/8 |
| XS | 54–55 | 6 3/4 – 6 7/8 | 21 1/4 – 21 5/8 |
| S | 55–56 | 6 7/8 – 7 | 21 5/8 – 22 |
| M | 57–58 | 7 1/8 – 7 1/4 | 22 3/8 – 22 7/8 |
| L | 58–59 | 7 1/4 – 7 3/8 | 22 7/8 – 23 1/4 |
| XL | 60–61 | 7 1/2 – 7 5/8 | 23 5/8 – 24 |
| 2XL | 62–63 | 7 3/4 – 7 7/8 | 24 3/8 – 24 3/4 |
| 3XL | 64–65 | 8 – 8 1/8 | 25 1/8 – 25 1/2 |
| 4XL | 66–67 | 8 1/4 – 8 3/8 | 26 – 26 3/8 |
| 5XL | 68–69 | 8 1/2 – 8 5/8 | 26 3/4 – 27 1/8 |
* According to HJC, 3XS is available for the C10 as a youth size.
HJC Y10 – youth sizes
| Size | Head circumference (cm) |
|---|---|
| YS | 48–49 |
| YM | 50–51 |
| YL | 52–53 |
Bicycle helmets – model-specific sizing
HJC Sports size ranges vary between certain model generations, especially for size L. The official model-specific measurements are therefore listed separately.
| Model | S – head circumference (cm) | M – head circumference (cm) | L – head circumference (cm) |
|---|---|---|---|
| Atara | 51–56 | 55–59 | 58–61 |
| Bellus | 51–56 | 55–59 | 58–61 |
| Bellus 2 | 51–56 | 55–59 | 58–63 |
| Calido | 51–56 | 55–59 | 58–63 |
| Coban | 51–56 | 55–59 | 58–63 |
| Crosser | 51–56 | 55–59 | 58–63 |
| Furion 2.0 | 51–56 | 55–59 | 58–61 |
| Furion 3 | 51–56 | 55–59 | 58–63 |
| Gleo (Kinder / Kids) | 49–55 | – | – |
| Ibex 2.0 | 51–56 | 55–59 | 58–61 |
| Ibex 3 | 51–56 | 55–59 | 58–63 |
| Route | 51–56 | 55–59 | 58–63 |
| Valeco | 51–56 | 55–59 | 58–63 |
| Valeco 2 | 51–56 | 55–59 | 58–61 |
Safety note: A size chart is a reference only. A helmet must fit firmly and evenly around the head, must not move out of position and should not create problematic pressure points. HJC warns that wearing the wrong helmet size can increase the risk of injury. Always try the helmet on and follow the product-specific fitting and safety instructions.
Updated: 11 August 2026. Basis: official HJC Europe motorcycle helmet size chart and proper-fit guidance, plus official HJC Sports product pages for the bicycle helmet models listed above.