• Optimized Transmission Design • Dual Linkage • Slidable Cam • Footboard Angle Adjustment • Sync-Coil • Dyna Beater • Hinge Guard Block • Swivel Spring Tight (US.PAT.NO.9236038) • Speedo-Ring • Para-Clamp II Pro • Oiles® Bearing Hinge (US. PAT.NO.6100460)