Box Components Box Four 8 Speed Wide/Narrow Chainring Black Friday It is the first 8

It is the first 8 speed specific chainring designed to optimize chain retention when using 8 speed chains

ETROTO:  57-584            Inch: 27

Dual hex screw tension adjustment

strategic design combining multiple layers of fiberglass

SHIMANO Equivalent RD-TY21 / RD-A070

Box Components Box Four 8 Speed Wide/Narrow Chainring Black Friday It is the first 8The 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.