Wilbers progressive fork springs
Promoto springs are as thoroughly crafted as springs of other product lines. Although they consist of type B silicon spring steel they are crafted by computer-controlled machines and were customized in road tests to exactly match the respective motorcycle model. Due to their progressive spring rate they offer sensitive response at slow compression speed but also prevent the fork from bottoming out a higher velocities or if you have to brake hard.
Product may vary from picture.
Download available ABE
Recommended oil viscosity and air chamber:
