SKF PRODUCTS - Increase Service Life and Reduce Friction! The feel of riding and durability are two decisive factors when designing seals for forks in motorcycles and bicycles. Especially in off-road applications, such as enduro or motocross, the requirements on the sealing are very demanding. SKF has developed a range of seals with this in mind. Solutions are available for both off-road and on highway use. For motorcycles, the seals come in pairs with a separate oil seal and dirt wiper seal tuned to each other to give low friction for the best riding experience, as well as long life.