The compact rear uprights are tiny in dimensions but are strong because of specific composite combination used. As a result of perfect molding, bearings squeeze into a corner uprights with no additional play and for that reason provide maximum protection. The trunk uprights function 2 jobs for mounting top of the roll-center linkage, to permit improvements towards roll-center place. The rear uprights take care of the mounting of optional graphite Aero discs for enhanced protection and traction.