33. How to Adjust a Threadless Headset
Learn how to check the adjustment of a threadless (Aheadset) and align the handlebars.
In today’s tutorial, we’ll learn how to adjust a threadless headset, otherwise known as an ‘Aheadset. For this job, you’ll need either a 5mm or a 6mm allen key, depending on your stem.
To loosen the stem, simply turn the allen key on top counter-clockwise a few turns. Don’t remove it completely. Then loosen the two bolts on the side. Now your stem should turn freely.
To check if the headset is tight, lift the front of the bike off the ground. The handlebar should rotate freely and fall to one side or the other. If it doesn’t, you’ll have to loosen the top bolt a little bit and try it again.
To check for play, hold the front brake, place one hand on your headset, and rock the bike forward and backward. If the headset is loose you’ll feel it, and you’ll have to tighten the top bolt a little bit.
Once the adjustment is set, check the alignment. I find it easiest to line up the stem with the front wheel while you’re sitting on the bike. Once the handlebar is straight, tighten the two stem bolts and check the adjustment again just to be sure.
New to the forum.
I have an older dual suspension mountain bike, a giant ATX900. It has a weird head tube inside diameter of 42mm, which puts it somewhere in between the old 1 1/4" standard and the 1 1/2" standard.
Anyone know what type of head set was intended for this diameter head tube?
Cam... Read more >>
So I got a cheap bike from craigslist that I'm trying to fix up. The headset to this thing is really loose, if I lift the handle bars I can shake the whole fork easily. (Sorry if my terminology sounds retarded, I'm not super bike savvy)
I tried to loosen handle bars and tighten the bolt the youtube guy told me to tighten, with no luck. The bottom of the fork near tire seemed just fine, but the top still shook around. It almost seems like I'm just missing an important part. Im including pictures of it all put together, taken apart, and all the parts from the problem area. Because I... Read more >>
I am trying to remove a headset so I can service it but one part won't come off, I'm trying lubricating it and leaving it overnight. But I don't know if I should be trying to screw it off or trying to bang it off.
Any help would be appreciated!... Read more >>
I have pressed headset bearings into steel frames many times, but in a couple of weeks I'll be doing it into carbon fiber - I do have the headset press in tools. In a video I watched, the guy checked the sizes with a digital Vernier gauge on the frame and the bearing piece - is this absolutely necessary? If so, does anyone know the tolerances for a light press fit? It'll save me looking it up in my old books.... Read more >>
advertised as 1 ⅛” headset. chinese carbon mountain bike frame on ebay. it has v brake tabs so i wouldnt' be surprise if it was a pretty old design. so do you think the fsas i linked above would work. Let me take some better pics.
here you go with some additional measurements.
cups are metal with black paint on them.
those numbers are 43.84mm, 35.05mm, and 8mm.
here's the fork
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[attachment=4796]I just got this bike and it needs work, the headset moves alot, i thought it was the bearings, it still might be, i cant see any, unless they are sealed? if they are sealed it seems everythings fine, though the gap from the forks to the stem is small so it wont lock all into place, making it move, i added a spacer but now the bolt will not reach the fork thread, the bolt is also slighty bent making it harder to tighten and work out whats up with it, do i need bearings? a new bolt? something completely different? im not very good with bearings at all so i need help please,... Read more >>
Is there one or two bearings in this assembly? If there is two .... then im gonna need one. Elgin 1938. Does anyone by chance have any diagrams of the Elgin 37,38?
Monk... Read more >>
Thanks for taking the time to read this.
I just got my hands on a 2nd hand Dahon folding bike.
There seems to be a little play in the headset but as this is my first folder I'm not sure if this is inherent in folders or not.
Would anybody know if it is inherent and have any ideas on how to fix it? I have some experience of changing threadless headsets on mountain bikes but I'm not sure about folder headsets.
Ben... Read more >>
I've acquired an old frame, I think early '80's Japanese or Taiwanese (thanks to nfmisso for his help there!) and I'm planning on building a single speed out of it. This is my first bike build so its a learning process for me, I'm pretty excited about the whole learning thing I must admit! I have a million and one questions to ask you bike guru's about bike building etc!
I plan on building the bike on a relatively low budget so I'll be looking on ebay for second hand parts etc. I want to keep the bike looking like an old bike not a new build where possible (as original as possible but n... Read more >>
Hi; I just bought a used, rather nice Columbus frame to build a lightweight for my daughter. It has (had) a no-name roller- bearing headset which was decidedly crunchy, to the extent that when the forks were turned backwards it almost jammed. Also there is a half-ring patch of bare metal on the lower front of the steering tube ..... no sign of damage to the forks or frame, so I suspect poor installation of a worn headset and have bought another. Anyone else come across this type of uneven friction? Don't want to put out a bike with wonky steering!... Read more >>
my first post here.
i decided i needed a little project so i boughta 1968 Hercules with a 21" frame. it will be a surprise for my daughter.
I'd like to replace the parts shown in the pics with new ones. When i took it apart all the bearings fell out. i wonder if i could replace the bearings with caged ones?
what are the names of these parts please?
[attachment=4173]... Read more >>
I'm new to the forum and need help. I bought a used year old Trek 7300 and then bought a headset extension to give me a more up right riding position. I'm 67 and bending over is no longer an option. Anyway to get to the point I installed the headset extension and after tightening the headset bolt there was still a little play in the headset. I'm pretty sure I tightened the headset bolt before the clamp bolts but after several attempts I can't say for sure I didn't forget something along the way as I said I'm 67. Anyway after several attempts I thought well maybe I just ne... Read more >>
Hi guys, I have a 2001 Gary Fisher Marlin. I took off the stem on my bike and didn't realize as the fork was loose the bearing fell out and broke. I'm not sure what size they are and the orientation it is suppose to be. The top bearing is still there. All i know is the bearing is in a retainer that is all. Any help would be amazing. Thanks... Read more >>
I'm trying to raise the handlebars on an old ladies Schwinn Traveler. I loosened the bolt to raise the handlebars, and once the handlebars are at the desired height the bolt will not tighten down anymore. I've been searching threads on here and learned there is a nut in the frame that I'm assuming I'm not catching anymore. Does anyone have any advice as to how I can raise the handlebars and still be able to tighten the bolt down? Or how to catch that nut so I can tighten the bolt? Any and all suggestions would be greatly appreciated. I will upload some pictures wh... Read more >>
Can anyone tell me what type of headset I have. If so any advise on how to service or videos on how to do so would be a great help.
Geoff... Read more >>