Headset and stem question...sequence question
09-20-15 | 09:20 AM
#1
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Headset and stem question...sequence question
Hello,
When I am trying to install my stem into the head tube I am having difficulty. If the head set nut is not tightened the stem will insert into the tube easily, after it is adjusted the stem seems to bind/tight. The stem will also slide into the fork tube when not installed on the frame.
This is a new build, but the parts are from the correct so no issues of compatibility.
My questions are:
1. should the nut be left loose and stem inserted and then tightened?
2. Do I need a taller shim in the stack incase the nut is binding on the fork tube?
3. Is there a sequence to install....do I leave the nut loose and set stem height and then tighten?
Regards, Ben
When I am trying to install my stem into the head tube I am having difficulty. If the head set nut is not tightened the stem will insert into the tube easily, after it is adjusted the stem seems to bind/tight. The stem will also slide into the fork tube when not installed on the frame.
This is a new build, but the parts are from the correct so no issues of compatibility.
My questions are:
1. should the nut be left loose and stem inserted and then tightened?
2. Do I need a taller shim in the stack incase the nut is binding on the fork tube?
3. Is there a sequence to install....do I leave the nut loose and set stem height and then tighten?
Regards, Ben
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09-20-15 | 09:26 AM
#2
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From: Ffld Cnty Connecticut
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Is this an old style 1" threaded headset and quill stem ??
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09-20-15 | 10:01 AM
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From: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
You sort of answered your own question. The stem binds if the locknut is tight, so install it first, then tighten the locknut.
The issue is concentricity. When tightened, the locknut isn't perfectly concentric with the ID of the fork. This is fairly common, and nothing to worry about. But if the fork ID and locknut ID are both close fits for the stem (as they should be), they'll slide on individually, but not as a pair when one is slightly offset (not concentric).
Minor issues of alignment are common in all sorts of assemblies, and your bike is no different. That's why many assemblies call for inserting and attaching ALL hardware before tightening any. Failure to follow that sequence is what has people throwing fits when the last nut and bolt won't fit through the (now) misaligned holes.
The issue is concentricity. When tightened, the locknut isn't perfectly concentric with the ID of the fork. This is fairly common, and nothing to worry about. But if the fork ID and locknut ID are both close fits for the stem (as they should be), they'll slide on individually, but not as a pair when one is slightly offset (not concentric).
Minor issues of alignment are common in all sorts of assemblies, and your bike is no different. That's why many assemblies call for inserting and attaching ALL hardware before tightening any. Failure to follow that sequence is what has people throwing fits when the last nut and bolt won't fit through the (now) misaligned holes.
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Just because I'm tired of arguing, doesn't mean you're right.
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09-20-15 | 10:13 AM
#4
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in threaded headsets , if the top nut screws onto the top edge of the fork steerer before It contacts the adjustable cup -nut
then the adjustment will come loose quickly.. so the stack may require a spacer
so The top and cup nuts tighten against each other (2 wrenches required)
before the top nut bottoms out against the end of the threaded fork steerer.
then the adjustment will come loose quickly.. so the stack may require a spacer
so The top and cup nuts tighten against each other (2 wrenches required)
before the top nut bottoms out against the end of the threaded fork steerer.
09-20-15 | 11:34 AM
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You sort of answered your own question. The stem binds if the locknut is tight, so install it first, then tighten the locknut.
The issue is concentricity. When tightened, the locknut isn't perfectly concentric with the ID of the fork. This is fairly common, and nothing to worry about. But if the fork ID and locknut ID are both close fits for the stem (as they should be), they'll slide on individually, but not as a pair when one is slightly offset (not concentric).
Minor issues of alignment are common in all sorts of assemblies, and your bike is no different. That's why many assemblies call for inserting and attaching ALL hardware before tightening any. Failure to follow that sequence is what has people throwing fits when the last nut and bolt won't fit through the (now) misaligned holes.
The issue is concentricity. When tightened, the locknut isn't perfectly concentric with the ID of the fork. This is fairly common, and nothing to worry about. But if the fork ID and locknut ID are both close fits for the stem (as they should be), they'll slide on individually, but not as a pair when one is slightly offset (not concentric).
Minor issues of alignment are common in all sorts of assemblies, and your bike is no different. That's why many assemblies call for inserting and attaching ALL hardware before tightening any. Failure to follow that sequence is what has people throwing fits when the last nut and bolt won't fit through the (now) misaligned holes.
Old style H.S.....That is what I thought but wanted to ask those with more knowledge.
Regards, Ben
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Voice recognition may sometimes create odd spelling and grammatical errors
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Voice recognition may sometimes create odd spelling and grammatical errors
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