Motorcycle Fork Cartridge Rod Jam Nuts

Motorbike front forks aren't just the two outer tubes you see - there's a separate internal cartridge doing the real work. Our closed vs open chamber article explains more - but sliding in the middle of that cartridge, with a reb adjuster assembly on the bottom & damping piston parts up top, is a fork cartridge rod.

The top of that hollow shaft needs to be locked securely to the rebound damping piston base tower, so these specially shaped long locknuts fasten the two together. Because of the tolerances & torque, these jamnuts shouldn't really be reused - try replacing them every suspension rebuild.

The clicker in the lower fork leg presses on the inner pushrod which adjusts the flow of oil through the piston & shim stack on the end of the rod - learn how to use them in our damping adjusters article.

We sell upgrades for suspension tuners too - improve the damping of your cartridge forks with one of our performance revalving kits, or if you're a pro with a suspension dyno you can mix up your own valving shims stack from a huge variety of sizes & thicknesses.