Box Components Box Four 8 Speed Wide/Narrow Chainring Black Friday simply position your phone and

simply position your phone and the magnets do the rest

Dual hex screw tension adjustment

Quad Lock MAG™ Cases are thinner and flatter with a customizable MAG Ring

you want to protect the bike and components when you are not riding to prolong their life

Box Components Box Four 8 Speed Wide/Narrow Chainring Black Friday simply position your phone andThe Box Four Wide Narrow chainring completes that package for the 1x8 system. It is the first 8 speed specific chainring designed to optimize chain retention when using 8 speed chains. The tooth profile and thicknesses are tailored to match the inside geometry of the unique Box Four chain.