Wunderlich Suspension Shock Absorber S4 + HPA - Lowering by -20 mm - rear

Facts and product features of the Wunderlich Suspension powered by TracTive S4 HPA shock absorbers

High-performance shock absorber of the latest generation, designed as an upgrade or replacement for the standard suspension. Developed to meet the high demands of discerning adventure riders who frequently ride off-road, touring riders who regularly travel with heavy loads, and riders seeking additional safety reserves. With PDS anti-bottoming system and hydraulic spring preload adjustment (HPA).

We individually select the spring rate based on your personal riding profile specifications.

• Damping characteristics
• Our shock absorbers are specifically developed for each vehicle and intended use, offering high performance and impressive reserves
• The balanced, sensitive damping characteristics of our suspension components ensure neutral, predictable handling, enhancing rider confidence and overall riding enjoyment
• The shock absorbers stand out for their outstandingly transparent feedback, optimising tyre-to-road contact, wheel guidance and directional stability while reducing tyre wear
• Individual damping adjustment: this high-quality shock absorber features high- and low-speed compression damping adjustment, meaning the compression damping can be tuned depending on the compression speed (i.e. the speed at which the damping piston moves during the process)
• The rebound damping adjustment with 18 clicks allows precise fine-tuning of the damping using the supplied suspension tool
• The shock absorber is equipped with a PDS (Progressive Damping System), which reduces the risk of bottoming out and the associated impact stresses under demanding conditions
• The PDS system and the extensive range of adjustment options for rebound and compression damping meet the highest demands of adventure and touring riders. They noticeably improve comfort and safety, while helping to reduce stress on the frame
• To achieve an optimal and sensitive response,
  • the oil channels are generously dimensioned to minimise oil flow resistance,
  • we use large-diameter pistons (46 mm),
  • as well as low-friction seals and specially designed shim stacks
• These closed shock absorbers feature an external, forged aluminium reservoir that supports thermal stability and system performance through optimal heat dissipation
• The generously dimensioned oil volume and large cooling surface ensure
  • a low, optimal operating temperature of the oil,
  • which not only ensures stable performance at the highest level,
  • but also increases the service life of both damper and oil

• Spring characteristics and preload
• Hydraulic spring preload: the shock absorber is equipped with a sealed, extremely robust hydraulic spring preload adjustment. The preload can be conveniently adjusted using an easily accessible handwheel. The sturdy adjustment mechanism is designed to withstand the toughest conditions
• The wide adjustment range compensates for a large variety of load conditions

• Setup
• Special Wunderlich Suspension tuning for adventure and touring riders with high demands on their suspension

• Individualisation
• We individually select the spring rate based on your personal riding profile specifications: after selecting your shock absorber, simply define your personal specifications during the ordering process – they form the basis for selecting the spring best suited to you

• Maintenance
• Each shock absorber can be completely and professionally serviced at the Wunderlich Suspension Center
• The suspension tool is included in the scope of delivery

Technical data

• Material
  • The shock absorber housings are precisely machined from high-quality aluminium
• Special features
  • PDS system – reduces the risk of bottoming out
  • Closed system
• Manufacturing quality
  • We use only high-strength components such as micro-machined, inductively hardened and tempered 42CrMo piston rods, premium-quality bearings and stainless-steel bushings, as well as low-friction seals
• Dimensions
  • Piston diameter: 46 mm
  • Piston rod diameter: 16 mm
• Spring preload adjustment
  • Hydraulic with handwheel (HPA)
• Installation position
  • Rear swing arm

Your Wunderlich benefits

• Wunderlich product. Small series. Handmade.
• Wunderlich design. Functional and integrated.
• Tested by Wunderlich
• Made in Europe
• 5-year warranty when 24-month maintenance intervals are observed