XRAY has released their new XB4 Aluminum rear uprights (hubs), CNC-machined from premium Swiss 7075 T6 aluminum. Designed and recommended for high-traction conditions, these uprights increase rear stability. They feature additional upper roll center positions for fine tuning, and roll center height can be adjusted using shims between upright and upper link. Wheelbase range has been increased and can be adjusted within a range of 4mm. Additionally black coated and laser engraved.