Shock Absorber Type 640 Road Preload Adjuster:Hydraulic Preload Adjuster (Wilbers-PA) (+$505) the non-adjustable cartridge is upgraded

the non-adjustable cartridge is upgraded to a Wilbers powered by ZF open cartridge with adjustable rebound and spring preload

the first spring rate is too soft while the second is too firm

but omits the compression reservoir and the option for high- and low-speed compression adjustment

New is the “blow-off” compression valve

Shock Absorber Type 640 Road Preload Adjuster:Hydraulic Preload Adjuster (Wilbers-PA) (+$505) the non-adjustable cartridge is upgradedThe basic edition of the Wilbers Adjustline mono shock absorber features the same advanced technology as the more complex versions. The only difference is the omission of the compression reservoir, and therefore the ability to adjust high and low speed compression. Despite this, the shock absorber makes no compromises in terms of response behavior or durability. Its radial piston design, wet run operation, and Teflon guided self aligning bearings