Motocross is going through a dynamic shift in suspension technology. Concepts that were way ahead of their time—like the Fox Air Shox and Factory Forx from the mid-1970s—are now viable options due to progress in technology and manufacturing.
Two of the latest suspension systems that have made headlines are Showa's Separate Function Fork (SFF) as used on the Suzuki RM-Z450 and the brand-new KYB Pneumatic Spring Fork (PSF), which is fitted to the 2013 Honda CRF450R and Kawasaki KX450F.
While SFF separates the spring into one leg and damping duties into the other, the PSF does away with springs altogether. Here is a closer look at the PSF and its alleged benefits.
Less work: Reduced weight means more-efficient damping circuits, allowing transitions from compression to rebound to happen more quickly, keeping the tire on the ground for improved traction.