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Curious about threaded-headset folding bicycles.

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Curious about threaded-headset folding bicycles.

Old 04-11-21, 03:26 PM
  #1  
Nyah
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Curious about threaded-headset folding bicycles.

I been considering the purchase of a KHS F20-JJ folding bicycle, for conversion to drop-bars. Since I see many other folding bicycles that appear to use this same technology, I thought that I might be able to get some info about the system as a whole, from this forum. This bicycle has a 1&1/8 threaded headset. I believe that it has a quill handlepost, and that a threadless stem is employed to secure the handlebars. This system would be all different from what the Dahon Speed (a threadless headset in conjunction with something other than a threadless stem) employs. So I'm curious about some things:

1. The handlepost on this bicycle folds to the outside. Can that be easily changed on these quill handleposts, so that it folds to the inside? Just loosen it up, rotate it around to whichever angle I want it to fold to and then tighten it back up?

2. How much height adjustment range does this system allow?

3. And an unrelated question: I don't see any magnet holding the fold together. Assuming that it doesn't include anything to hold the fold together, is there any way to make this happen so that I can roll it while in folded mode?
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Old 04-11-21, 04:56 PM
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Originally Posted by Nyah View Post
I been considering the purchase of a KHS F20-JJ folding bicycle, for conversion to drop-bars. Since I see many other folding bicycles that appear to use this same technology, I thought that I might be able to get some info about the system as a whole, from this forum. This bicycle has a 1&1/8 threaded headset. I believe that it has a quill handlepost, and that a threadless stem is employed to secure the handlebars. This system would be all different from what the Dahon Speed (a threadless headset in conjunction with something other than a threadless stem) employs. So I'm curious about some things:

1. The handlepost on this bicycle folds to the outside. Can that be easily changed on these quill handleposts, so that it folds to the inside? Just loosen it up, rotate it around to whichever angle I want it to fold to and then tighten it back up?

2. How much height adjustment range does this system allow?

3. And an unrelated question: I don't see any magnet holding the fold together. Assuming that it doesn't include anything to hold the fold together, is there any way to make this happen so that I can roll it while in folded mode?

1. No. The angle will be completely wrong. But replacements are easy to come by.
2. dunno
3. Velcro straps are idiot-proof and hold better than magnets.
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Old 04-12-21, 10:58 AM
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Don't buy it on the assumption that the Dahon aftermarket parts will fit the KHS. Confirm. The Dahon Speed variants I am familiar with use an internally threaded headset and threadless stem.

As stated above just rotating will change the angle:

stolen picture from the internet

Dahon and Brompton use plastic catches to retain the stem while folded
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Old 04-12-21, 03:25 PM
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Actually, I'm sort of interested in it because it's not Dahon technology.
Here's the bicycle below. Doesn't appear to be any angle in the handlepost.
To me, that is straight and square with the headtube.
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Old 04-12-21, 03:53 PM
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I don't see how rotating the handle post would be a bad choice. If it won't fold properly it would be easy to put it back.
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Old 05-10-21, 09:02 PM
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Is anyone on this forum familiar with folding bicycles that have threaded headsets? I'd like to know what the options are for changing the height of the handlebars on them. The KHS F20-JJ doesn't appear to have a height-adjustable handlepost so, I'd like to know what I can do about that.
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Old 05-10-21, 10:52 PM
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You can buy 1" and 1-1/8" quill type steerers that have adjustable height and are folding. Quality varies. I bought a 24 dollar unit originally for one bike, but I was worried about it snapping off. I didn't use it.

You can also buy a quill adapter that takes a 1-18" collar, Then you can install any number of 1 1/8" theadless steerers of adjustable height. That was my final solution. I liked the 1-1/8" steerer n my Downtube Nova, so I bought a spare part for about $80. Mounted that on a 1" threaded bike.
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Old 05-11-21, 04:49 PM
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Nyah
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Originally Posted by Doc_Wui View Post
You can buy 1" and 1-1/8" quill type steerers that have adjustable height and are folding. Quality varies. I bought a 24 dollar unit originally for one bike, but I was worried about it snapping off. I didn't use it.

You can also buy a quill adapter that takes a 1-18" collar, Then you can install any number of 1 1/8" theadless steerers of adjustable height. That was my final solution. I liked the 1-1/8" steerer n my Downtube Nova, so I bought a spare part for about $80. Mounted that on a 1" threaded bike.
That's some helpful info. I think that I've seen some of the threadless steerer-posts that you're talking about. I might have to shorten the pieces of it in order to make it all low enough but, I'm feeling positive about it. It's all a lot clearer for me, now. Thank you!
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