KASK Protone ICON Bicycle Helmet - Red - Large Mountain Bike If using a 9-speed drivetrain

If using a 9-speed drivetrain use a 10-speed chain (shifts and works well on a 9-speed drivetrain and fits the ring tighter for better chain retention)

an offset slit design that holds up to 168 flies

Double-block" center tread increases braking performance

Cable end fits SRAM or Shimano bicycle shifters

KASK Protone ICON Bicycle Helmet - Red - Large Mountain Bike If using a 9-speed drivetrainThe new synonym for victory, the Protone Icon helmet features the latest technological advances in safety, ventilation, and aerodynamics to make it an icon of road cycling. The Protone Icon takes its design from KASK's winning Protone helmet and has improved upon it in every way possible. A redesigned internal frame gives the wearer greater safety. Seamless technology joins the lower and upper parts of the shell to give it a refined, elegant look and