Spec-R R1 hard coated centre pulley
Spec-R introduce this optional centre pulley for the R1 touring car. The part is machined from 7075 aluminium, sports a hard anodised pulley surface and a multi-piece design with the pulley being secured by a thick O-ring. The part increases the drivetrain efficiency and is sold as set of one piece.
Source: Spec-R [spec-r.com]