A perfectly functioning and coordinated suspension must be present between the rider and the trail. In bike design, suspension and shock absorbers are more decisive for riding pleasure, control, comfort and safety than almost any other element. We at Denk Engineering want to develop the ultimate suspension for every type of bike, individually fulfil the intended purpose of the bike and the rider’s wishes and, last but not least, convince through the robustness and reliability of our systems.
In this field, Denk Engineering can point to numerous pioneering achievements. The U-Turn system sold on Rock Shox and the patented OTS technology are just two of the revolutionary innovations that identify Denk Engineering as one of the most experienced and most successful developers of suspension systems.
The Dyad RT 2, developed in close collaboration with FOX, is an OTS shock (from Denk Engineering’s patented Oil Transfer System shock absorbers) with revolutionary properties:
the handlebar lever can be used to switch between a hard shock absorber with little spring travel for cross-country and mountain biking or a soft shock absorber with a lot of spring travel for downhill. In addition, the damping and sag are automatically perfectly adapted to the short or long spring travel.
The outstanding feature: no compromise is made in the damping with the two spring travels because progression and rebound damping are automatically appropriately adapted. Every spring travel setting has its own independent damping unit for compression and rebound strokes. During design of the shock the volume ratios of the positive and negative chambers can be adjusted to an almost unlimited extent. As a result, very linear characteristics are achieved (like those of a steel spring), that cannot otherwise be achieved with conventional air shocks.
Also intelligently thought out: the shock elements (shims, valves) were not adapted from other components and are thus particularly well cooled. Another advantage: the pull-shock principle permits greater freedom when designing the frame or implementing new types of frame concepts.
The patented OTS technology is used for shocks with integrated spring travel adjustment and still represents the industry standard. The innovative technology is characterized by the oil being compressed by the shock unit instead of passing the damping piston through oil. This provides almost linear characteristics – as can otherwise only be achieved with heavier steel spring dampers.
A total of nine patents have been registered in the area of OTS technology.
This was the first shock to use our OTS technology. We also added a travel management system. The shock function could be selected by a single lever from the handlebar. The user could select full lockout, half travel, or full travel of the shock.
Instead of the typically far too progressive air springs of that time, this shock had almost linear air springs in both travel settings – like a shock with two different coil springs.
Another feature was the Intelligent Rebound Valve (IRV) which was a nice safety feature. It automatically provided the shock with stronger rebound damping when the shock bottomed out. As a result, the shock could be operated with faster and more sensitive rebound damping and was still safer with large impacts.
The Genius Shock was the first air damper to be developed that had three spring travel options in addition to linear characteristics. Full travel, traction mode and lockout could be selected from the handlebar via the TLC lever.
The shock was specially constructed for the Genius series of frames and, for the first time, exploited the advantages of four-pivot kinematics in combination with its control by means of the Intelligent Linkage System (ILS).
Denk Engineering developed a system in 1998 that permitted individual adjustment of the length and spring travel of downhill forks. We had this system patented and further developed it for cross-country bikes. The variable spring travel led to a significant improvement in climbing properties whilst maintaining ride comfort.
The system was sold to Rock Shox and sold under the famous name ‘U-turn’ from 2000 onwards. The technology set new standards and is still on the market.