The Tractor XL sprocket is made from 6061-alloy with a super thick 16mm core diameter that tapers to 6mm thick at the teeth. 

Despite the thicker design, the Tractor XL weighs about the same as traditional sprockets  - 4.0 oz. (25t) and 4.7 oz. (28t) with a 24mm bore (19mm and 22mm spindle adaptors included). 

Spare chainring screws and bolts for Bolts for Super Record, Record, Chorus and Athena Ultra-Torque carbon chainsets (FC-AT300/SR100)

Includes the 4 standard bolts plus the longer arm position bolt with chainring spacer

Black anodised aluminum

Thread lock treated to prevent loosening whilst in use

BR-RE700