| VdxTitle: | Adjusting Threaded Headsets |
| Length: | 11:37 |
| Author: | Park Tools |
| URL | URL |
| Keywords: | Threaded Headsets |
| VdxSummary: | Good introduction to both threaded and unthreaded |
This video starts with a really good explanation of the difference between threaded and unthreaded. Then he goes into detail adjusting the threaded, using two wrenches.
The video has a good index:
0:33 Is your headset threaded?
1:50 Diagnosing the issue
3:33 Adjustment procedure
Relevance: This applies to my 1980's Norco, the Miyata and also the Rocky Mountain. It does not apply to the Brodie or Opus Legato, which both have the threadless system.
Adjustment: The way the bearings work is there is a race threaded onto the fork, and thenthe race to bearing
ChatGpt: Talks about "stack order": (I draw my own diagram) Revised stack, describing each "race" as either a "cup" or a "cone"
I am drawing a diagram but I am confused with bearing surfaces.. Each bearing must have two surfaces, and the balls are between them. So I can draw a bearing cup facing upwards (the crown race). Then some ball bearings. Then you say the head tube. What is the upper surface of that lower bearing?
Crown Race: Cone, pressed onto the fork crown, bearing surface angled upwards
Lower ball bearings
Lower cup (pressed into bottom of the head tube, concave facing down)
Head Tube
Upper cup (pressed into top of head tube)
Upper Ball bearings
Adjustable Cone, threaded onto steerer, bearing surface downward
Keyed washer
Locknut
Answer: The bearing cup is pressed into the frame.
Key terms:
- Race: A generic term meaning a track that balls roll on. Thus it can be either a "cup" or a "cone". For lower bearing
- Cup (outer race)
- Cone (inner race)
- Preload (the adjustment before final lock nut. A better term is "adjustment"