The compact backside uprights are small in size but are strong as a result of certain composite combination utilized. Because of perfect molding, bearings squeeze into a corner uprights without any additional play and for that reason give maximum security. The trunk uprights feature 2 jobs for mounting top of the roll-center linkage, to permit modifications towards roll-center position. The rear uprights take care of the mounting of optional graphite Aero discs for enhanced security and traction.