Shock Absorber Type 643 Competition PSD643 QSD Diagonal, traversable reservoir. Originally developed for the Honda VFR 1200, this Competition shock adds a diagonally mounted, rotatable compression reservoir to the Wilbers construction kit, unlocking multiple mounting options on bikes with limited space. The upper mount integrates the high and low speed compression adjusters for precise damping control. Spring preload is continuously adjustable with the supplied spanner or, optionally,