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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 03-22-07, 03:05 PM   #1
jchou701
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simple question about threading a fork

i've been over to two local bike shops - one says they can't thread the fork i have and one says they can - can someone clear this up for me?

i have a 1", steel, soma fork
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Old 03-22-07, 03:16 PM   #2
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If the fork is already threaded and you need to extend the threads and then cut off the excess steerer tube, thats pretty easy. A little elbow grease and patience.

If the the steerer tube is not threaded at all, then you are bordering on a technique that requires rocket surgery. Very difficult to start the die square on the steerer tube. Although I can't remember seeing a 1 inch fork that wasn't threaded.
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Old 03-22-07, 04:15 PM   #3
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yea mine has no threads at all.....
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Old 03-22-07, 04:37 PM   #4
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Quote:
Originally Posted by jchou701
yea mine has no threads at all.....
best bet is to go threadless in this case...
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Old 03-22-07, 05:15 PM   #5
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well, it's still possible to thread the fork though right?
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Old 03-22-07, 05:19 PM   #6
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The material in the steer tube is thinner (weaker) than that of a threaded one. It can be done, but it's not advisable.
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Old 03-22-07, 05:22 PM   #7
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Originally Posted by jchou701
well, it's still possible to thread the fork though right?
Why would you want to? Threadless is the superior system.
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Old 03-22-07, 05:36 PM   #8
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Why would you want to? Threadless is the superior system.
BUT! BUT! BUT!!! it doesn't look cool enough. obviously that's what's most important.

leave it threadless and stop being such a cry baby.
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Old 03-22-07, 08:40 PM   #9
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Why would you want to? Threadless is the superior system.
says who?
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Old 03-22-07, 08:57 PM   #10
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oh no, not again!

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Old 03-22-07, 09:10 PM   #11
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says who?
Cored machined stems. Nuff said.
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Old 03-23-07, 06:42 AM   #12
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Originally Posted by megatron
says who?
This dude does, sucka:


That said, if somebody says that they can thread it, thread it. If it breaks, you can blame them and plead ignorance, right? Free dental work.
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Old 03-23-07, 06:57 AM   #13
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Quote:
Originally Posted by el twe
The material in the steer tube is thinner (weaker) than that of a threaded one. It can be done, but it's not advisable.
This is not neccessarily true. Do this at your own risk.

Unless the steerer tube is too short why bother though a super cheap stem and headset will perform better then whatever threaded stuff you have and you can always sell them.
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Old 03-23-07, 08:23 AM   #14
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If this is something you really want to do, take the fork to a reputable frame builder and get them to cut off the current steerer near the crown, and then sleeve a new threaded steerer onto it. This is the best (and probably the only) way to do this safely.

You could also just get a nice, classic looking Salsa stem and not worry about it.
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Old 03-23-07, 10:24 AM   #15
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Originally Posted by jim-bob
Why would you want to? Threadless is the superior system.
+1

Though I do like the look of a classic old threaded type with a nice stem better.
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Old 03-23-07, 01:45 PM   #16
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Quote:
Originally Posted by jchou701
i've been over to two local bike shops - one says they can't thread the fork i have and one says they can - can someone clear this up for me?

i have a 1", steel, soma fork
Have you checked to see if a 22.2mm (1") quill stem will tighten up properly inside the steerer tube? The inside diameter of threadless steerers are rarely consistant. It would suck to have it threaded only to find out it's not usable.
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Old 03-24-07, 01:51 AM   #17
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buy a threddedd fork!
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Old 03-24-07, 02:48 AM   #18
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Quote:
Originally Posted by jchou701
well, it's still possible to thread the fork though right?
Possible, but completely unrecommended. Your LBS either won't have the machien to do it, or they'll **** it up. Or it'll strip. Just buy a threaded fork.

The amount you'd pay in labour to have a a finished product that is a semi-hack job would be the equivalent to a new columbus steel threaded fork.
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Old 03-25-07, 03:47 AM   #19
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Quote:
Originally Posted by Svr
Have you checked to see if a 22.2mm (1") quill stem will tighten up properly inside the steerer tube? The inside diameter of threadless steerers are rarely consistant. It would suck to have it threaded only to find out it's not usable.
I might be being totally ignorant as I have never actually played around with threadless setups, but if a quill will grip the inside of the steerer, is there any reason you can't just cut the tube at the top of the headset and use the stem as if it was a threaded system? Provided you're happy with never being able to use it threadless...
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Old 03-25-07, 04:30 AM   #20
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Originally Posted by Rattlebag
I might be being totally ignorant as I have never actually played around with threadless setups, but if a quill will grip the inside of the steerer, is there any reason you can't just cut the tube at the top of the headset and use the stem as if it was a threaded system? Provided you're happy with never being able to use it threadless...
What are you talking about?
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Old 03-25-07, 04:42 AM   #21
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I wondered this after looking at http://www.fixedgeargallery.com/2007...asonThomas.htm

I am currently building a CrossCheck so this caught my eye - at the FGG pic the fork seems threaded - and looks like a original Surly fork. Because 1 1/8" threaded headsets are quite rare IŽd think that either

a) Older Surlys had 1" steerer tube and threaded forks?

or

b) Someone had threads cut in the original Surly fork and found a suitable headset (could it be 1 1/8" ?)

cool bike, nonetheless. My kind
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Old 03-25-07, 04:48 AM   #22
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I did this before. It's still running fine. If you want to thread it, any good bike shop should have a die for threading a fork, if you really want to, see if you can borrow it (it isn't exactly a commonly used tool. In Australia this may be a little easier.....) and use a file (or optimally a lathe) to bevel the top of the fork. There is a green, thick cutting compound which smells like capers (no ****) which can make this infiniteley easier. Then just thread it on until it bites, go 1/2 turn, 1/4 turn back, then 3/4 turn, 1/4 turn back etc. etc.

Of course if the steerer wall is too thin then you will have big problems with bulging when you tighten your stem's centre bolt, not to mention cracking and bending.


EDIT: Ah, its Trefolex I'm thinkin of.
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Old 03-25-07, 09:48 AM   #23
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I had a problem once building up a large frame bike. Could not find a suitable 1" threaded fork with a long enough steering tube. I was able to find NOS 1" unthreaded with hugely long steerers. (I think there was a brief transition stage from threaded to unthreaded that used 1".) So all I had to do was get it threaded. I was advised that it is difficult to start the threads out square, so I should ask lots of questions before paying someone to do it.

I did ask lots of questions. A couple of bike places said they could do it, but did not inspire much confidence. One place though seemed to have done it before and seemed to know what they were doing. I paid them a small amount (maybe $15?) to do it. Worked great. Still use that bike today and have not had one problem.

A previous poster mentioned that unthreaded forks might not all have the same (usable) inside diameter. I cannot speak to this except to say it was not an issue on the fork I used.

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