Matris Replacement Fork Springs Product Details: This is a replacement pair of fork springs to fit Matris fork kits Spring Rate 6.5NM Outer Diameter 30mm Length 220mm If you need any advice or are unsure about fitment please get in touch and a member of our team will be happy to help. Manufactured in Italy to the highest quality, Matris springs are made from Silver-Chrome alloy steel with specific production processes to guarantee durability and quality over time. The correct spring is important for a comfortable set-up depending on the bike model, use, ride style and rider weight. Matris have been manufacturing some of the highest quality hydraulic suspension systems for more than 40 years. For Matris, improving safety is more than just a slogan, it .