Giro Tyrant Spherical Mountain Bike Helmet

The Giro Tyrant Spherical Helmet merges contemporary aesthetics with cutting-edge protective engineering for progressive trail enthusiasts. Built around Mips Spherical technology, it features dual foam construction - rigid EPS for high-impact scenarios and compliant EPP for low-speed tumbles, working in tandem to dissipate rotational forces during crashes. Wind Tunnel Ventilation keeps you cool during demanding rides, whilst the extended full-cut design delivers comprehensive coverage without compromising on modern styling. Purpose-built for riders who refuse to compromise between protection and attitude.

• CHEEK PAD VENTILATION — Allows cool; fresh air to circulate inside the helmet to help cool you; and to address sweat management.
• HARDSHELL WITH IN-MOLD HARDBODY™ LOWER WRAP — The two-piece shell combines a tough outer hard shell with a polycarbonate lower shell permanently fused to the liner for durability without excess weight.
• SPHERICAL TECHNOLOGY — Spherical Technology's Ball-and-Socket design; powered by Mips®; helps redirect impact forces away from the brain by allowing the outer liner to rotate around the inner liner during a crash. It also eliminates contact with hard plastic or slip-planes against the skin.
• PROGRESSIVE LAYERING&TRADE — Two different materials are used to manage impact energy: One layer is EPS which is well-suited to high-speed crashes. The other is a lower-density EPP foam with rebound characteristics that address the more common; low-speed impacts.
• ROC LOC® AIR DH FIT SYSTEM — This revolutionary fit system adds a new dimension to helmet performance by enhancing cooling; as well as fit comfort and stability. Using a patented design that suspends the helmet just slightly off the top of the skull; Roc Loc® Air DH allows cool airflow to pass directly over your head; further enhancing the performance of vents and internal channeling that exhaust heat out of the helmet. Fit and feel adjustments mimic the Roc Loc 5; allowing you to easily custom tune fit tension and fore-aft tilt of the helmet in seconds using a single hand.
• TOOL-FREE; BOLT-ON VISOR — Easily adjustable without need for tools or extra fiddling; and offers plenty of vertical adjustment to stage goggles when you're not wearing them.
• STACK VENTILATION — Vents at the brow line help warm air to be drawn up and away from your goggles to eliminate fogging; while allowing seamless integration with goggles.

Bike Helmet Size Guide

How to measure your size – Wrap a measuring tape around your head, keeping the tape level from front to back. Note the measurement and reference the Size Guide. Note: Make sure the helmet fits with a little room when the fit system is loose, and sits low enough to protect your forehead without hindering your vision. Once you’ve got the right size, you can adjust the fit.