Leatt · MTB 4.0 V21 · Leatt MTB 4.0 V21
Leatt MTB 4.0 V21 Carbon
Quick Facts at a Glance
Verified Safety Snapshot
How this helmet’s verified certifications map to recognized safety homologations and crash testing.
Safety standards compliance is based on official manufacturer documentation and public safety laboratory test results. Always verify regional compliance labels on the physical helmet prior to use.
Verified Fit & Sizing Guide
Head shape profile matching and interactive size calculator based on verified manufacturer dimensions.
Leatt MTB 4.0 V21 is a full-face helmet designed for mountain biking with an extended rear coverage for better protection against impacts from above and behind.
How to measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.
Design Concept & Background
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Dominate the trail with the Leatt MTB 4.0 V21 Carbon, where cutting-edge safety meets aggressive aerodynamics. Crafted from high-modulus carbon fiber, this full-face helmet delivers an unmatched strength-to-weight ratio, ensuring you stay light on your feet without compromising protection. The integrated MIPS system provides critical defense against rotational impacts, a common scenario in technical downhill riding. Experience superior airflow through the optimized venting system, keeping you cool even during the most intense descents. With its sleek, modern aesthetic and premium finish, it is not just gear; it is a statement of performance. Trust Leatt to push the boundaries of helmet technology, offering peace of mind so you can focus on conquering the steepest lines.
Rider Profile & Intended Use
Where to buy
Price History & Trends
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Product Concept & Specifications
Leatt (New Zealand)Engineering & Technical Analysis
The Leatt MTB 4.0 V21 Carbon utilizes a multi-density EPS liner and an integrated MIPS (Multi-directional Impact Protection System) to mitigate rotational forces during oblique impacts. Its carbon fiber composite shell offers superior stiffness-to-weight ratios compared to traditional fiberglass, reducing overall mass while maintaining crash energy absorption capabilities.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Technology & Convenience
Interactive Size & Fit Finder
Leatt MTB 4.0 V21 is a full-face helmet designed for mountain biking with an extended rear coverage for better protection against impacts from above and behind.
How to measure
Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, and repeat for consistency.
Available Colors & Graphics
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Data Confidence & Verification Provenance
Helmetsan enforces field-level verification and multi-source cross-referencing. Unverified values are explicitly flagged rather than estimated.