Giro Eclipse Spherical MIPS Road Bike Helmet - Matte Black / Red Size:Small (51-55cm) selecting Retrace Route will provide

selecting Retrace Route will provide turn-by-turn directions to route you back to the starting point of your ride by reversing the route you just rode

5A) Mount size： φ21

dust proof

you bypass the frame's thread

A single lock-on design clamps them tightly in place so you can focus on attacking the trail

Giro Eclipse Spherical MIPS Road Bike Helmet - Matte Black / Red Size:Small (51-55cm) selecting Retrace Route will provideECLIPSE SPHERICAL HELMET THE AERODYNAMIC ECLIPSE SPHERICAL IS OUR MOST SOPHISTICATED, STYLISH, AND LIGHTWEIGHT AERO ROAD HELMET, AND IT'S CRAFTED WITH SPHERICAL TECHNOLOGY POWERED BY MIPS, SO YOU CAN RIDE WITH MORE COMFORT AND AN ADDITIONAL LAYER OF PROTECTION. AERODYNAMICS INCREMENTAL GAINS, EXPONENTIAL REWARDS Not only is Eclipse Spherical a big step up from the speed of our previously fastest aero road helmet, the Vanquish, it is the fastest road