Due to their construction they manage to take small road damages as easy as deep potholes or brutal braking manoeuvres. That is the result of our critical testing- and development procedures. We permanently test our bikes on racetracks like the “Nürburgring” or on the German autobahn. This provides us with the necessary experience of creating the ideal progressive fork springs. Not before all skilled test drivers are satisfied, a product is offered to the market. Wilbers progressive fork springs are resistant to wear off. They have a lifetime guarantee and a detailed installation manual. Together with the best fork oil and a precisely adjusted air chamber you can expect perfect results and unforgettable riding experiences.