Bell Z20 Aero Size:M The XC easily adjusts to

The XC easily adjusts to different bike frame sizes with the simple movement of the wheel hoops

It's been designed with the essentials in mind: Nikwax Hydrophobic Down 800-fill insulation resists moisture and maintains warmth

and with CycleOps' quick-cam locking mechanism

Soft and snuggly yet substantial enough for all-day comfort

For 74mm caliper on 74mm fork with 180mm rotor

Bell Z20 Aero Size:M The XC easily adjusts toDetails Built to Lead Every watt counts. The Z20 Aero is built with that in mind, delivering uncompromising performance, innovation, fit and comfort. With its drag defying shape, Progressive Layering, and Integrated MIPS, this helmet provides real world performance for riders who want to lead. Specs Total Vents 10 vents Ventilation Overbrow Ventilation features intake ports on the brow of the helmet to usher in cool air and push it through the air