On 8/8/2019 9:10 PM, Frank Krygowski wrote:
On 8/8/2019 8:55 PM, jbeattie wrote:
On Thursday, August 8, 2019 at 1:39:57 PM UTC-7, AMuzi wrote:
On 8/8/2019 2:54 PM, Tom Kunich wrote:
On Tuesday, August 6, 2019 at 7:34:51 AM UTC-7, Sir
Ridesalot wrote:
I was looking at a couple of my old bicycle frames with
the rear derailleur cable routed along the top of the
chainstay. I'm curious now. Why did the rear derailleur
cable routing get moved to under the chainstay?

Cheers

Andrew told us about when it happened but not why. The
rear derailleur cable was moved when the downtube
friction shifters were moved to Shimano Brifters in the
70's.

Running the cables under the downtube gave the cables a
cleaner run from the head tube to the under bottom
bracket plastic runner.


First modern under-BB guides were steel, mid 1970s.
First nylon gear plate was Vitus in 1979.
First integrated shifter was Shimano 1990, followed by
Campagnolo Ergo a year or so later.

With the Vitus, the cables were structural.
https://tinyurl.com/y4kh5o3g It was the first cable-stay
frame design and ensured that the tubes would not separate
in the event of epoxy failure.

Just curious: Were there many joint failures in Vitus
frames? I don't remember.



No, not numerous but some. The material is flexible enough
that one might pull the joint apart enough to clean it and
rebond with a better epoxy.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971