The compact backside uprights are small in space but are strong as a result of certain composite combination utilized. As a consequence of perfect molding, bearings squeeze into a large part uprights without any extra play and for that reason provide maximum security. The trunk uprights function 2 jobs for mounting the top of roll-center linkage, to permit improvements towards roll-center spot. The rear uprights take care of the mounting of optional graphite Aero discs for improved security and traction.