Re: RE: Re: Fine Tuning Shifting

On Thu Jul 25 23:07:28 2024 Frank Krygowski  wrote:

On 7/25/2024 4:54 PM, AMuzi wrote:

On 7/25/2024 2:58 PM, Tom Kunich wrote:

I have a continuing problem with the shifting goin out of adustment.
In one case the right shifter wire partially broke from my
over-tightening it but in the other three cases I've had to mark it
down to cable stretch which Andrew says doesn't exist. But the wires
did not move and the shifting moved towards shifting into a faster
gear. I can only assume that wire layup tightened up a little and
showing those symptom.

Bowden wire bicycle gear wires do not stretch.

>
Agreed. And if they did, Tom should be able to use his amazing technical
skills to demonstrate it in his basement lab, a la Fogel Laboratories. I
suggest hanging a cable from a fixed point on the ceiling, applying
varying weights and using a caliper of some sort to measure differences
in length. Keep in mind the cable tension necessary to shift a
derailleur is probably under ten pounds.
>

  Casing seats into ferrules and
ferrules into frame stops, but the wires do not change.

>
Right.
>
-- - Frank Krygowski
>

    Frank, why do you think that your two bits are worth anything at all? You according to your own postings are riding a friction shifting 6 speed freewheel bike. What makes you think that you know anything whatsoever about a modern bike, If wires don't stretch why is there so much lever play in the brakes with heavier wires still?