The GIRO RADIX MIPS Mountain Bike Helmet in size M (55–59 cm) with a matte stone finish is a trail and enduro helmet that combines multi-impact protection and rotational-impact mitigation. It is designed for active off-road riding and provides a balanced mix of coverage, ventilation and an adjustable fit. The helmet integrates a low-profile shell and internal impact liners to absorb impacts while MIPS technology is used to reduce rotational forces transmitted to the head.
Advantages
The helmet offers multi-impact safety construction and a MIPS rotational protection layer to address both linear and rotational forces. An adjustable retention system ensures a secure, stable fit across the 55–59 cm head size range, while carefully positioned vents promote airflow to help manage heat during prolonged efforts. The matte stone surface provides a subdued aesthetic that resists glare and fits a variety of kit styles.
Suitable for
- Trail riding and enduro mountain biking where both coverage and ventilation are important
- Riders seeking rotational-impact protection alongside standard impact absorption
- Cyclists who need an adjustable, medium-sized helmet (55–59 cm)
When it may not be suitable
This helmet is tailored for trail and enduro use and may not be the best choice for road racing where aerodynamic performance and minimal weight are primary priorities. It also may not be ideal for riders whose head circumference falls outside the 55–59 cm range or for those who prefer full-face protection for very aggressive downhill tracks.
Key specifications
- Size range: medium fit for 55–59 cm head circumference
- Protection: multi-impact liner construction with rotational-impact mitigation layer
- Ventilation: multiple vents positioned for active airflow during off-road riding
- Fit system: adjustable retention for stable on-head positioning
- Finish: matte stone color
How to use
Place the helmet on your head so it sits level and covers the forehead without tilting back. Adjust the retention dial or strap system until the helmet feels snug but comfortable, ensuring the straps form a V under the ears and the chin strap fastens securely. Check that the helmet does not shift significantly when you move your head; perform a quick fit test before each ride. Replace the helmet after significant impact, or if structural damage is visible, and follow manufacturer care instructions for cleaning and storage to maintain protective properties.
What to consider before purchase
- Confirm your head circumference falls within the 55–59 cm medium size range
- Decide if multi-impact and MIPS rotational protection meet your safety needs
- Consider whether a matte stone finish and the helmet profile match your riding style and kit
Usage recommendations
Use the helmet for trail and enduro rides where balanced protection, ventilation and an adjustable medium fit are required. Regularly inspect straps and the shell for wear, and replace after any significant impact to ensure continued effectiveness of the multi-impact and rotational protection systems.
