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head tube   Message List  
Reply | Forward Message #830 of 1017 |
Re: head tube

--- In bentechriders@yahoogroups.com, "Jim" <obsidian_nj@...> wrote:
>
> If you want to use a threaded headset you can thread the fork
> tube with the proper tool.

In theory, yes; in practice, it's almost impossible to cut this thread
accurately once the fork is assembled; here's why.

When threaded forks are made, the thread on the steerer tube is
usually cut on a lathe before the tube is brazed to the forks
themselves. Once the fork is assembled, it's difficult to fit it in a
lathe.

There are such things as dies for cutting this thread, but they're
usually used for cleaning up or extending a thread that's already
there. If you try to use one to cut a thread from scratch on a
steerer tube, the chances are your thread will not be perpendicular to
the axis of the tube. This will make it hard to adjust the headset
properly at best, and at worst, your headset components won't screw
onto it at all.

BMX forks are relatively cheap; if you need a threaded one, buy a
threaded one and save yourself a lot of grief.

I agree though, that there's no advantage in threadless on a 'bent.
(Actually, I think there's no advantage in threadless, period, but
that's just my opinion!)




Mon Jan 22, 2007 10:10 am

philprosser2002
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Message #830 of 1017 |
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Hello everyone, I am getting all of my parts togetherfor a swb under frame steering bent. I have a question regaurding the steer tube. I want to get a bmx 20"...
Randy
utahsailing
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Jan 19, 2007
9:20 am

Hi Randy, The head tube itself is neither threaded or threadless, but the fork and headset you use will be one or the other. The original plans call for a...
Jim
obsidian_nj
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Jan 21, 2007
10:55 pm

... In theory, yes; in practice, it's almost impossible to cut this thread accurately once the fork is assembled; here's why. When threaded forks are made, the...
Phil Prosser
philprosser2002
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Jan 22, 2007
10:10 am

Randy, I am in the process of building a bentech type recumbent with SWB and under seat steering. I used the rear diamond off a ten speed and I used a 20"...
matospeter@...
peteramatos
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Jan 22, 2007
12:42 am

Hey Guys, thanks for your replies, I had found a set of 20" bmx forks with 1 1/8 threadless steer tube. I was just curious if anyone had ever used this size...
Randy
utahsailing
Offline Send Email
Jan 23, 2007
2:14 pm
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