このダイヤルはスペシャライズド S-Works マウンテンバイクシューズの2013年モデルから搭載されはじめました。

This dial is used on Specialized S-Works mountain bike shoes beginning with the 2013 model. It will have an allen screw on the side of the dial that holds it to the shoe. Also, look closely and compare the shape of the grip on the dial to be sure.