After a certain age the spring tension of the original fork springs decreases. When braking, the fork dives in deeply and the chassis becomes unstable. Our PROMOTO fork springs are progressively wound, which means that they respond sensitively to the smallest bumps, but do not dive in deeply during sudden braking manoeuvres. This makes the chassis much more stable! A TÜV certificate is always included. We recommend the use of fork oil with SAE10 (Order-No.: 83-1011).