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is a 2mm steel steerer tube thick enough to thread?

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is a 2mm steel steerer tube thick enough to thread?

Old 03-12-06, 02:24 PM
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eddiebrannan
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is a 2mm steel steerer tube thick enough to thread?

any help appreciated
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Old 03-12-06, 07:28 PM
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Not something that I'd try.

What are you planning to cut the threads with? I own a set of taps for threaded forks, but I wouldn't bet on my ability to get the threads started squarely. This sounds to me like one of those jobs where the confidence level of the mechanic is inversely porportional to the likelihood that he's ever done it before.
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Old 03-12-06, 09:42 PM
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The wall thickness is likely thick enough, but it's not a good idea.

Reason 1 - As mentioned, getting the die started squarely would be difficult.

Reason 2 - The threads on production steerers are rolled instead of cut. Rolling actually deforms the metal surface and results in a stronger, more durable thread. Cutting leaves a jagged "V" shape at the valley in between each thread that can lead to a stress crack. The valley of a rolled thread looks more like a "U".
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Old 03-12-06, 10:06 PM
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Originally Posted by eddiebrannan
any help appreciated
That's plenty thick enough, standard steel steerers are 1/16" (1.6 mm) thick.

However, you won't be able to fit a standard stem into it. I got bit by this once on a Gunnar. Had to take the fork to a machine shop to get reamed out to the standard 7/8" inside diameter.

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Old 03-14-06, 10:02 PM
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Sheldon, have you ever noticed that once you enter a thread ...... it stops. Oh wise one!
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Old 03-15-06, 08:41 AM
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Originally Posted by toolboy
Sheldon, have you ever noticed that once you enter a thread ...... it stops. Oh wise one!
It must be the avatar...
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Old 03-15-06, 09:23 AM
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Originally Posted by Sheldon Brown
That's plenty thick enough, standard steel steerers are 1/16" (1.6 mm) thick.

However, you won't be able to fit a standard stem into it. I got bit by this once on a Gunnar. Had to take the fork to a machine shop to get reamed out to the standard 7/8" inside diameter.

Sheldon "Probably Better To Stick With Threadless. It's A Better System Anyway" Brown
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yeah i checked the fork and a standard stem fits in it, therefore it CANNOT be 2mm thick, despite the guy selling it to me saying "i don't know where you get those calculations from" like i'm making up the number of millimeters in a goddamn inch.

1.6 x 2 = 3.2 + 22.2 = 25.4mm = 1 inch, so yes, 1.6mm makes sense. thank you.

eddie "i don't care if it's a better system, there'll be no threadless doodads on my bike" brannan
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Old 03-16-06, 08:33 AM
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Originally Posted by eddiebrannan
yeah i checked the fork and a standard stem fits in it, therefore it CANNOT be 2mm thick, despite the guy selling it to me saying "i don't know where you get those calculations from" like i'm making up the number of millimeters in a goddamn inch.

1.6 x 2 = 3.2 + 22.2 = 25.4mm = 1 inch, so yes, 1.6mm makes sense. thank you.

eddie "i don't care if it's a better system, there'll be no threadless doodads on my bike" brannan
Nice quote. Hey, as long as you're stuck in the past, I've got some 36-spoke high-flange Campy wheels for sale...
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Old 03-16-06, 08:47 AM
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pm me pls

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Old 03-16-06, 03:57 PM
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i just measured another fork and discovered that while measuring w/ caliper that i was using the flat edge, so it gave me 2mm, but your correct it is 1.6mm, my bad!

Last edited by na975; 03-16-06 at 04:56 PM. Reason: info
 
Old 03-17-06, 11:53 AM
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no sweat na975, if you'd been right the fork wouldn't have fitted on my bike, so i'm glad you measured it wrong.

anyway, fork was cut and threaded with no problems whatsoever. as discussed we cut it a couple inches too long, threaded from there and then cut again to length. straightforward, albeit a good workout for the arms! certainly nothing to be wary of in the future.



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Old 03-17-06, 01:07 PM
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looks , fit perfect! what frame is that?
 
Old 03-17-06, 01:10 PM
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nothing specialóbianchi pista
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Old 03-17-06, 01:13 PM
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if the rake had been any less, it would not have worked, looks tight though.
 
Old 03-17-06, 01:18 PM
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yeah the clearance with the downtube isn't quite that tight. about half an inch at the closest point
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