This is an optional XRAY Composite Upright Rear in Medium compound. This super-compact rear upright is made from MEDIUM-hardness composite material. Perfect balance between reliability and performance, for use on left or right side. Features 7 different upper roll center positions.
The rear uprights have 0° toe to ensure stability and to prevent suspension geometry changes in hard crashes. It also features a hole for the set-screw that secures the pivot pin in place.
MEDIUM-hardness composite is suitable for most track conditions, especially very-low and low-traction tracks.
For maximum drivetrain reliability, larger 5x12mm ball-bearings are used in the outer position to handle increased dynamic load. On the inner position, smaller 5x10mm ball-bearings are used to minimize unsprung weight.