New frame thread grief
01-23-19, 10:06 PM
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New frame thread grief
I am trying to build a NOS Italian frame but threads on the steer tube and bottom bracket are uncooperative. Do new threads need to be deburred? If so what is a good way to do so?
01-23-19, 10:43 PM
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It was common years ago that the team mechanic would do all the final frame prep procedures like chase and face, ream and face and such on new frames. But I sure don't know how well prepped the frame you have is. Certainly the chance of paint in the threads, the full compliment of prep, damaged threads is possible. Not sure we can be of much more help then to explain and suggest what others have needed to do in the past. We're not in a position to see your frame.
As example do you know if your frame is Italian threaded or English (as was the trend to change to in the 1990s). Is there paint is the various threads like bottle bosses or BB shell? Are you sure that the parts you have are of the correct threading/specs? Like I said we don't know anything for real yet. Andy
As example do you know if your frame is Italian threaded or English (as was the trend to change to in the 1990s). Is there paint is the various threads like bottle bosses or BB shell? Are you sure that the parts you have are of the correct threading/specs? Like I said we don't know anything for real yet. Andy
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01-24-19, 08:40 AM
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this thread probably should have been posted in Mechanics or even C&V. How old is the frame? You need to find a bike shop that has an Italian bb tap(probably) and a die for the steerer. Not sure if anyone in Boise would have that.
01-24-19, 05:50 PM
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When you write that the threads are uncooperative, it's a little vague. If they just have a little surface rust or paint you can try to wire wheel the rust or paint off. I have small one that I use occasionally that fits inside a bb shell.
If that doesn't work, then you will have to find some taps/ dies for it.
If that doesn't work, then you will have to find some taps/ dies for it.
01-24-19, 06:07 PM
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~>~
Find an Old School shop that still has these tools and the skills to use them or a local frame builder to perform the tasks for you.
-Bandera
Last edited by Bandera; 01-24-19 at 06:34 PM.
01-24-19, 06:07 PM
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The bike is a mid-90's columbus tubing, and because it's new, the bb and steer tube have never been installed. I'm pretty sure my components are matching in terms of size and threading, but the threads on the frame are course and unpolished and seem to only be threadible with great force. I'm just wondering if the frame has not yet been fully prepared and there is a common treatment to the threads that has not been completed.
01-24-19, 06:33 PM
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~>~
The bike is a mid-90's columbus tubing, and because it's new, the bb and steer tube have never been installed. I'm pretty sure my components are matching in terms of size and threading, but the threads on the frame are course and unpolished and seem to only be threadible with great force. I'm just wondering if the frame has not yet been fully prepared and there is a common treatment to the threads that has not been completed.
-Bandera
Last edited by Bandera; 01-24-19 at 07:32 PM.
01-24-19, 06:57 PM
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steel bikes usually need the bb threads to be chased in order to have reasonable threading. I don't think that is normally true of steerer threads. Unless it's just the first thread that is not that great. In either case, paint can cause this problem, but it seems like the OP would have mentioned that
01-24-19, 07:46 PM
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~>~
-Bandera
01-25-19, 08:15 AM
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It really depends on the builder. Columbus sold unthreaded steerers, so it's possible that the builder of this frame did a crummy job of threading. If it is a steerer threaded by Columbus, it wouldn't need chasing at all unless damaged.
01-25-19, 09:14 AM
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All it should take to get a steer ready is carefully filing a chamfer around the lead thread. It's normal to have a 45 degree chamfer to the root of the thread, to insure an easy start. As for the BB threads, my mid 90's Tommasini Sintesi didn't need any prep before assembly.
