# GIRO RADIX MIPS Mountain Bike Helmet — size M (55–59 cm), matte stone

**URL:** https://aio.lv/en/product--giro-gr-39305-224-m--12382493
**Data updated:** 2026-04-26 20:54 (EEST)
**Category:** Protective Helmets
**Manufacturer:** GIRO
**Manufacturer code:** GR-39305-224-M
**EAN:** 199270035239
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

GIRO RADIX MIPS is a mountain bike (MTB) helmet with MIPS rotational impact protection, offered in size M (55–59 cm) and a matte stone finish. Designed for trail and enduro riding, it features multi-impact safety technology, adjustable fit for stable retention, and ventilation to manage airflow during active use.

## Long description

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.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All GIRO products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized GIRO service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty