Leatt · MTB 4.0 V21 · Leatt MTB 4.0 V21
Leatt MTB 4.0 V21 Matte Black
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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Conquer rugged trails with the Leatt MTB 4.0 V21, a full-face helmet engineered for speed and safety without compromising breathability. Crafted from high-impact composite materials, this matte black masterpiece offers an aggressive, aerodynamic profile that slices through the air, reducing drag while keeping you cool on long descents. The advanced ventilation system ensures optimal airflow, preventing overheating during intense climbs or technical sections. With a secure fit and superior impact absorption technology, it delivers peace of mind when pushing your limits. Whether you are racing downhill or exploring remote singletrack, the MTB 4.0 V21 combines cutting-edge protection with a sleek, modern aesthetic that turns heads on every ride.
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 utilizes a multi-density EPS liner architecture designed to manage rotational impact forces specific to mountain biking dynamics. Its aerodynamic shell geometry minimizes wind shear while maintaining structural rigidity through carbon fiber reinforcement in critical zones.
Fit & Shell Structure
Intermediate Oval Shape
Balanced oval fit: standard ergonomic curvature fitting 80%+ of riders.
Safety & Certifications
Acoustics & Aerodynamics
Technology & Convenience
Certification Documents & References
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
View on retailers
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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.