Cables cutting into bottom bracket
03-17-21, 01:45 PM
#26
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It is worth checking every once in a great while for the cable cutting through the liner. I don't know what the service life is of either cable liner shown.
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03-17-21, 02:36 PM
#27
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Some builders filed a cable track into the casting.
03-17-21, 05:27 PM
#28
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I've seen a lot of bikes with this sort of configuration. Given the thickness of the shell and the anticipated movement of the shift cable (i.e. very little) I can see no way that this configuration will compromise the condition of the shell. Before the under-shell routing, we had brazed on clips above the shell. Even though they are much thinner, I've never seen one of them cut through by the cable.
Just ignore and consider it part of the vintage experience
Just ignore and consider it part of the vintage experience
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03-18-21, 08:24 AM
#29
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Not sure I understand your question. The difference to me is that the liner has a lot more lubricity properties than a steel cable on a steel surface. As the cable starts a groove, the contact surface area increases with a corresponding resistance or drag, coefficient of friction kinda thing. The liner is probably better than when the cable was cutting through the paint!
It is worth checking every once in a great while for the cable cutting through the liner. I don't know what the service life is of either cable liner shown.
It is worth checking every once in a great while for the cable cutting through the liner. I don't know what the service life is of either cable liner shown.
If the grooved guideway wasn't better why is it used on more expensive bikes?
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03-18-21, 10:15 AM
#31
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Loaded
Yeh but he said nothing about towing a caravan with the cables going under the BB.
That's a completely different kettle of fish.
That's a completely different kettle of fish.
That gave me a good laugh.
03-18-21, 10:59 AM
#33
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I agree that the cable will not cause significant damage to the BB shell. On the other hand, protecting it could prevent the spread of rust, and that can't be bad.
I recently put a plastic cable guide on my 1971 Raleigh Super Course. It has brazed on cable guides for over the BB but I needed the left one to be under for the new front derailleur. At first I just ran the cable without anything, but it didn't stay still, and the derailleur went out of adjustment.
So I took the plastic guide and drilled and tapped a hole. The bolt did interfere with the sealed BB so I cut the bolt shorter.
The thing that looks like another cable is the electrical cable for my tail light.
I recently put a plastic cable guide on my 1971 Raleigh Super Course. It has brazed on cable guides for over the BB but I needed the left one to be under for the new front derailleur. At first I just ran the cable without anything, but it didn't stay still, and the derailleur went out of adjustment.
So I took the plastic guide and drilled and tapped a hole. The bolt did interfere with the sealed BB so I cut the bolt shorter.
The thing that looks like another cable is the electrical cable for my tail light.
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Tom Reingold, tom@noglider.com
New York City and High Falls, NY
Blogs: The Experienced Cyclist; noglider's ride blog
“When man invented the bicycle he reached the peak of his attainments.” — Elizabeth West, US author
Please email me rather than PM'ing me. Thanks.
