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Tweeks Cycles£159.00Visit shop Giro Helios Spherical Helmet - Matte Black, L (59-63cm)
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The Giro Helios Spherical is a premium, high-performance road and gravel helmet designed for adult cyclists who prioritize advanced safety, maximum ventilation, and a lightweight feel. Utilizing Mips-powered Spherical Technology, this helmet provides superior impact management by allowing independent movement between liners, though it commands a premium price point compared to entry-level foam-only helmets.
| Age Group | adult |
|---|---|
| Colour | Black |
| Gender | Unisex |
| Model Part Number | 38955-255-M |
| Brand | Giro |
Standard Mips uses a plastic slip-plane inside the helmet, whereas Spherical Mips uses two independent foam liners that move like a ball-and-socket joint, offering better comfort and ventilation.
While it can be used for light gravel riding, it is designed specifically for road and performance cycling and does not provide the extended rear coverage required for aggressive mountain biking.
Giro recommends replacing any helmet after a significant impact, or every 3 to 5 years even without a crash due to natural material degradation.
Yes, the antimicrobial padding is removable and replaceable if it becomes worn or too compressed over time.
No, the Helios is a pure road-style helmet and does not include a visor.
Ensure the Roc Loc 5 Air dial is fully engaged and check that the internal padding is correctly snapped into the shell.
Adjust the tri-glide strap dividers under the ears to ensure the webbing sits flat against the side of your face.
To achieve the perfect fit, start by loosening the Roc Loc 5 Air dial at the back of the helmet. Place the helmet level on your head, ensuring it covers your forehead. Tighten the dial until it is snug but comfortable, then adjust the side strap dividers so they sit just below your ears. The chin strap should allow enough room for two fingers between the strap and your chin. To care for the helmet, hand wash the pads in mild soap and water and allow them to air dry completely. Never expose the helmet to harsh chemicals or extreme heat sources, as this can degrade the EPS foam structural integrity.
