Giro Helios Spherical MIPS Helmet - Matte Black Size:S Bottom Bracket Shell Width (mm):

Bottom Bracket Shell Width (mm): 86mm - 121mm

Two shift cables (2100mm and 1700mm)

Compatibility with 13-speed cassettes: all-encompassing

The size adjustment system spans from temple to temple around the back of the head

Weight: 60g

Giro Helios Spherical MIPS Helmet - Matte Black Size:S Bottom Bracket Shell Width (mm):The heart of the Helios's extraordinary design and performance is Spherical Technology, which utilizes a ball and socket design powered by Mips, the market leading brain protection system that can help to reduce rotational forces. Spherical Technology allows the helmet's outer liner to rotate around the inner liner during a crash, and also allows Progressive Layering of the inner and outer liners to provide more comprehensive protection and