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fc-moto.uk£345.16Visit shop Troy Lee Designs Men's Black Matt D4 Mips Stealth 2025 Carbon Downhill Helmet
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The Troy Lee Designs D4 Mips Stealth 2025 Carbon Downhill Helmet is engineered for adult downhill mountain bikers who prioritize high-level impact protection and a lightweight feel. Its standout benefit is the combination of a high-strength unidirectional (UD) carbon shell with advanced Mips C2 rotational technology, though users should be aware that the professional-grade performance comes with a higher price point compared to entry-level helmets.
| Age Group | adult |
|---|---|
| Colour | Black |
| Gender | Male |
| Model Part Number | 139437016 |
| Brand | Troy Lee Designs |
The Mips C2 system is designed to allow the helmet to slide slightly during an impact, which helps reduce the rotational forces transmitted to the brain.
Yes, while designed for downhill, its lightweight carbon construction makes it a popular choice for aggressive enduro riders who prioritize maximum protection.
You should replace your helmet after any significant impact or if the materials show signs of degradation or wear, typically every 3 to 5 years depending on frequency of use.
Many riders keep spare liners to swap out after heavy sweat-inducing rides; check your specific packaging for included extras.
Use a flexible measuring tape around your head. If you fall between sizes, it is generally recommended to try on the size that fits most snugly without creating uncomfortable pressure points.
Adjust the internal padding configuration or check if you need a different shell size based on your exact head circumference.
Small surface scuffs are usually cosmetic. However, if the carbon shell shows cracks, deep gouges, or structural deformities, the helmet must be replaced immediately.
To achieve the best fit, measure the circumference of your head just above your eyebrows and refer to the size guide to match your measurement with the correct shell size. Ensure the chin strap is tensioned properly so the helmet does not shift during use. For care, clean the exterior shell with a soft cloth and mild soap. Avoid using harsh solvents or high-heat drying methods, as these can damage the carbon fiber integrity and the protective foam liner. Always store the helmet in a cool, dry place away from direct sunlight when not in use.
