Down tube shifter, band clamp bolt: torque setting?
01-21-24, 02:40 AM
#1
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Thread Starter
Down tube shifter, band clamp bolt: torque setting?
For a 753 down tube. Don't want to over torque it.
Any Nm ideas, or feel guides?
Campy Victory.
Any Nm ideas, or feel guides?
Campy Victory.
01-21-24, 03:50 AM
#2
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Do a test on a frame the finish of which you don't care as much.
A properly tightened clamp should crease the paint slightly (you have to remove it to check).
But -
You have a 753 frame with no pip to keep the clamp from sliding?
A properly tightened clamp should crease the paint slightly (you have to remove it to check).
But -
You have a 753 frame with no pip to keep the clamp from sliding?
01-21-24, 06:16 AM
#3
Senior Member
Thread Starter
Thanks for the paint crease tip.
No other tube to test on.
01-21-24, 06:53 AM
#4
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Never thought about the potential for damaging the tube itself... but also never considered that there was a torque spec for it either.
My 753 Raleigh Team has braze-on shifter mounts, but the front derailleur does clamp on. The tubing never seemed so lightweight that this sort of damage was a concern.
Steve in Peoria
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01-21-24, 07:57 AM
#5
Blamester
Put some tape on the frame where you want the clamp. Snug it up gently. Check how it fits because you may want to move it.
Get a feel for it. There is no harm in doing it up a few times to check. Leave the tape on it till you are confident it's a good fit and secure. Step by step add cables check tension. Always release the cables before you adjust it. Eventually you will ride it and it doesn't move. Any other time it moves is fine so long as it does no damage.
I place great importance on a good bolt and the tool fit. If the screwdriver is a good fit on the bolt it won't move. If it starts to move on the head of the bolt it's the fit or too much torque.
The last bike I built the clamp on fd pulled down on the first ride. The same thing really. But it did no damage because it was just below minimum torque. And only moved a fraction. And I had a tool with me. So I could add a touch.
Get a feel for it. There is no harm in doing it up a few times to check. Leave the tape on it till you are confident it's a good fit and secure. Step by step add cables check tension. Always release the cables before you adjust it. Eventually you will ride it and it doesn't move. Any other time it moves is fine so long as it does no damage.
I place great importance on a good bolt and the tool fit. If the screwdriver is a good fit on the bolt it won't move. If it starts to move on the head of the bolt it's the fit or too much torque.
The last bike I built the clamp on fd pulled down on the first ride. The same thing really. But it did no damage because it was just below minimum torque. And only moved a fraction. And I had a tool with me. So I could add a touch.
01-21-24, 09:09 AM
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A product like this friction tape may help.
