To install a threadless headset, you are going to place the bearings first, both top and bottom, on the opening where the fork is supposed to enter. Put on the spacers, the headset and the dust cap and screw it all down. The threadless headset has no threading on the on the steering columns so you only have to push them onto the column.
View the discussion thread. Do not use cup guides if guides press on any preinstalled cup-bearing unit ex.
For headsets not fitting cup guides, simply press using threaded press plate and sliding press plate. Pressure on the outer rim of aluminum head cups may visually scar the cups.
If not using the guides, it can help to press one cup at at time. Place upper headset cup on top of head tube. Hold one cup guide onto top threaded press plate and lower assembly through top headset cup. Install second cup guide onto sliding press plate, and place lower cup onto guide.
Engage sliding press plate onto hex shaft, and push plate upward until headset cup meets head tube. Release lever. Sliding press plate lever must be engaged in one of seven hex shaft notches. Pull downward on lower press plate to test engagement.
Turn handle clockwise slowly and inspect alignment of cups as cups enter head tube. Continue and press cups fully into head tube. If threaded press plate has bottomed on threads of hex shaft, turn threaded press plate counter clockwise until it is again flush with top of threads. Re-engage sliding plate to a higher notch, and continue to press cups.
If cups will not press using handles, other problems are present and should be addressed. Grease bearing retainers and bearing race cups. NOTE: Do not grease steering column. Install bearing retainers into cup shaped races.
Place fork through head tube. Install adjusting race and race centering cone onto column. Press centering cone into adjusting race to help hold fork. Install spacers and accessories as appropriate. Install stem and snug stem bolts. Check for adequate clearance from top of column to top of stem. Add spacer under stem if necessary.
Image below is view of steering column and stem. There is a gap between stem and top of column. Remove bolt and top cap to inspect steering column. Lubricate adjusting bolt and reinstall cap and bolt by hand only. Do not tighten. Loosen stem bolt s that secure stem to the steering column. Lubricate these bolts if they are dry. NOTE : Do not lubricate inside stem or on steering column surface. Wiggle the stem side to side to see that it is loose.
If the stem is jammed or rusted frozen to the steering column, no adjustment can be made. Align stem straight to wheel and gently secure the top bolt. Stop when any resistance is felt. Tighten stem bolt s. Check for play by pulling back and forth on fork.
Turn the handlebars in different directions while checking for play. There may be play at this early setting. Use care when grabbing suspension forks, because the legs may have play. Grab upper portion of fork. To adjust bearings, loosen stem bolt s. Secure stem bolts, check for play again. Repeat adjustments as above until play disappears. To knock out a headset, use PVC pipe, think I use 28mm. Cut it lengthways so you can flare it out so it looks like the proper tools.
Works a treat and no damage as you can have as much as needed protruding at the top. Or a careful way of balancing it in place. I am keen to learn to do as many spannering jobs myself if I can and replacing the headset is one of the last on the list. My best advice, buy a headset press. Again, I used a flat blade screwdriver for years — and as a result damaged numerous cups. Mainly aesthetic damage to the lip, but still, looks half arsed, becasue it is. To knock the cups out an old seatpost is handy, and work your way round tapping it with a hammer.
I learnt this trick off Hora. The bigger the hammer, the better. Small taps with a heavy hammer are better than mighty swipes with a light one. However a few minutes spent down at a proper hardware store will get you some threaded rod and enough large washers to do the job for pennies.
Last time I looked On-One had a tool at a decent price. The top cap presses the stem and spacers down on the top cover to achieve bearing load. To do this, the top cap is anchored to the fork using either a star nut for use with steel, aluminum, or titanium steerer tubes or an expansion plug for use with carbon steerer tubes and a long bolt that is set in the top cap. To install a star nut, you must use a special star nut setter.
This tool consists of two sleeves: the inner sleeve has a threaded post on which the star nut is threaded, and the outer sleeve slides over the steerer tube. The inner sleeve is hit with a hammer to drive in the star nut, and the outer sleeve keeps the inner sleeve straight and has a lip to stop the star nut from being inserted too far. If you are using an expansion plug, install the plug so that the top cap has room to be adjusted both in and out.
The expansion plug will have an Allen bolt that can be tightened to expand the plug in the steerer tube and hold it in place. Home Excerpts How to install a threadless headset. To learn more about installing a headset, read Essential Bicycle Maintenance and Repair. Active Aging. Coaching and Officiating. Fitness and Health. Health Education. Nutrition and Healthy Eating.
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