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Idle headset question

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Old 10-09-11, 07:19 AM
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Kimmo
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Idle headset question

How would you make half a headset work?

Look at this bike I found on Velospace!





How the hell...?
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Old 10-09-11, 07:26 AM
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FBinNY 
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The bike has an internal upper bearing, and the top cap works in a way similar to threadless systems to adjust the bearings.
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Old 10-09-11, 07:27 AM
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About the only way I can think of is that there is a cartridge bearing that is a press fit into the very top of the headtube and the steerer is a press fit into the inner race of that bearing. The fits would have to be tight to keep the fork from dropping out of the bottom of the headtube if the front wheel is lifted.

Edit: I just saw FB's posting but i don't think the top cap in the photo is anything but a cover. The topcap of a threadless headset rotates with the fork and this one appears to rest on the stationary edge of the headtube. Also the cap is not at right angles to the steerer but it cocked several degrees relative to it as it looks parallel to the top tube.

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Old 10-09-11, 08:11 AM
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Whatever's going on in there, it's pretty damn neat and clever.
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Old 10-09-11, 08:48 AM
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Originally Posted by Kimmo View Post
Whatever's going on in there, it's pretty damn neat and clever.
I suppose so, if you're the type that can pedal while standing on your head. Unless of course it was made for an orangutan.
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Old 10-09-11, 10:37 AM
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Old 10-09-11, 11:07 AM
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Hoo boy

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Old 10-09-11, 11:53 AM
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Originally Posted by Kimmo View Post
Hoo boy

Wow. Just wow.
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Old 10-09-11, 12:12 PM
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Integrated seat mast yet to be cut, obviously
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Old 10-09-11, 01:13 PM
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IMO, the easiest way to make that to work is to use something like a quill stem center bolt, and attach it to a top cap or something and then in the bottom another cap welded.

Those russian bikes were pretty cool.
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Old 10-09-11, 07:31 PM
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Originally Posted by Kimmo View Post
How would you make half a headset work?

Look at this bike I found on Velospace!





How the hell...?
There's another bearing under the cap on top of the head tube.

N.B. that's a Soviet-era "Tachyon" time trial bike. Nice catch!
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