A high performance chainset from the classic ATB group, using the most advanced 10-speed Dyna-Sys chainrings. Forged Hollow Tech II aluminium cranks offer unrivalled strength-to-weight ratio. Lightweight construction with external super smooth bottom bracket bearings for efficient use. Drilled steel & carbon composite construction middle ring combined with a thicker aluminium double anodized 42 tooth, & plated aluminium 24 tooth ring for excellent rigidity & durability. Close ratio gear combination: 42-32-24T provides enhanced cadence while reducing pedal feedback on suspension bikes. HG-X chainring with patented spike pins give smooth & fast gear shifts under load..