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Once you have the fork out of the frame, you can see what kind of bearings the headset uses. The illustrations below show the assembly order for typical headsets with different types of bearings. A headset may or may not have contact-type seals as shown under the lower bearing of the headset at the left. | Once you have the fork out of the frame, you can see what kind of bearings the headset uses. The illustrations below show the assembly order for typical headsets with different types of bearings. A headset may or may not have contact-type seals as shown under the lower bearing of the headset at the left. | ||
This threaded headset has bearing balls in cages (retainers), though generic loose bearing balls can be installed as replacements in most headsets which were supplied originally with retainers. This threadless headset has cartridge bearings. Only exact replacement cartridges will work. Cartridge bearings are mostly to be found in newer, threadless headsets. | This threaded headset has bearing balls in cages (retainers), though generic loose bearing balls can be installed as replacements in most headsets which were supplied originally with retainers. This threadless headset has cartridge bearings. Only exact replacement cartridges will work. Cartridge bearings are mostly to be found in newer, threadless headsets. | ||
382px | [[Bild:Bicycle headset exploded view.png|382px|left]] | ||
[[Bild:Bicycle headset (threadless) exploded view.png|382px|right]] | |||
Once you have removed the fork, you can check the condition of cartridge bearings by turning them with your fingers. They should turn smoothly, though there will usually be some drag from bearing seals. Exact replacement is needed with cartridge bearings -- or else, replace the entire headset. | Once you have removed the fork, you can check the condition of cartridge bearings by turning them with your fingers. They should turn smoothly, though there will usually be some drag from bearing seals. Exact replacement is needed with cartridge bearings -- or else, replace the entire headset. | ||
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For a threaded system, you can then turn the bike right-side up to complete assembly/adjustment and wipe off the excess grease. | For a threaded system, you can then turn the bike right-side up to complete assembly/adjustment and wipe off the excess grease. | ||
For a threadless system, you need to secure the fork before turning the bike right-side up. I sometimes use an old toe strap for this, tying the fork crown to the down tube of the frame. | For a threadless system, you need to secure the fork before turning the bike right-side up. I sometimes use an old toe strap for this, tying the fork crown to the down tube of the frame. | ||
==Replacement/Installation== | ==Replacement/Installation== | ||
Removing and re-installing the headset bearing races is not necessary for a normal overhaul, only when you are replacing the headset or installing a new fork. | Removing and re-installing the headset bearing races is not necessary for a normal overhaul, only when you are replacing the headset or installing a new fork. | ||
