Giro Radix MIPS Adult Dirt Bike Helmet - Trail-Ready Protection

Our review of the Giro Radix MIPS Adult Dirt Bike Helmet finds it best suited for core trail riders who want a balance of protection, ventilation, and adjustable comfort for long days on the mountain. The single biggest reason to consider this helmet is its combination of a tested safety design and the MIPS rotational protection system, which together deliver market-leading crash energy management without adding unnecessary bulk. It feels purposeful on the trail and stays comfortable for hours thanks to a customizable fit system and thoughtfully engineered ventilation.

Key Features

• Market-leading protection: Engineered in Giro's category-leading helmet test lab to prioritize impact performance and rider safety on rough trails.
• MIPS rotational protection: The integrated Multi-Directional Impact Protection System is designed to redirect rotational energy during angled impacts for added safety.
• Roc Loc 5 fit system: Easily adjust vertical position and tension to dial in a stable, personalized fit that reduces pressure points on long rides.
• In-Mold construction: The polycarbonate shell is fused to the EPS foam liner to keep the helmet lightweight while enhancing durability and ventilation.
• P.O.V. visor with 15deg adjustment: The adjustable visor lets riders change sightline and sun protection quickly without tools.
• All-day wearability: The combination of coverage, ventilation, and low weight helps riders stay comfortable and confident on extended trail sessions.

Who It's For

The Radix MIPS is aimed at core trail and dirt riders who need a durable, well-ventilated helmet with thoughtful safety features and an adjustable fit system for all-day comfort. Its coverage and light weight make it a solid choice for riders who move between technical climbs and fast descents.

Riders who want a full-face helmet, or those seeking the absolute lightest cross-country race shell, should look elsewhere; this helmet is optimized for trail use where a balance of protection, ventilation, and durability matters most.

Pros & Cons

Pros

• Solid safety focus with lab-engineered impact performance and added rotational protection from MIPS.
• Comfortable, adjustable fit thanks to the Roc Loc 5 system that lets you fine-tune position and tension.
• Durable In-Mold polycarbonate shell fused to EPS for good ventilation without extra bulk.

Cons

• Not a full-face design, so riders wanting chin protection will need a different model.
• Fit and ventilation are trail-focused; extreme enduro or XC racers might prefer more specialized helmets.

Specifications

Brand	Giro
Model	Radix MIPS
Protection system	MIPS (Multi-Directional Impact Protection System)
Fit system	Roc Loc 5 adjustable fit
Construction	Polycarbonate outer shell fused to EPS liner (In-Mold)
Visor	P.O.V. visor with 15 degree adjustment

Our Verdict

The Giro Radix MIPS is a well-considered trail helmet that blends tested impact protection, rotational-energy mitigation, and a highly adjustable fit into a comfortable, ventilated package. Core trail riders who value safety and all-day comfort will find it good value, while those needing full-face protection or highly specialized race shells should consider other options.

Frequently Asked Questions

Does this helmet include rotational impact protection?
Yes. The Radix integrates the MIPS system to help redirect rotational forces in angled impacts.

Can the fit be adjusted for different head shapes?
Yes. The Roc Loc 5 fit system allows vertical position and tension adjustments to customize stability and comfort.

Is the visor adjustable?
Yes. The P.O.V. visor offers about 15 degrees of adjustment to change sightline and sun protection.