Motorcycle Fork Cartridge Spring Perches & Parts

An internal damping cartridge cylinder sits in the middle of the outer case tubes inside most oil filled motorbike front forks. The suspension fluid can either be shared with the rest of the fork leg, or can be separately sealed - read more in our Closed vs Open Chamber Forks technical article.

Slid over the outside of the cartridge inserts are these conical assemblies - plastic or alloy stands with holes cut in for oil flow - which seat the top of the fork coil springs onto the cartridge & connect suspension forces between upper & lower fork pipes. We also sell these individual servicing parts separately, such as preload spacer washers & rings, spring seat collars, guide bushings & wire retaining clips.

But if factory isn't good enough, you can mod your bike with our performance billet spring perch pairs.