Quoted message said:Back to mechanics of "cable stretch" and specifically that rear brake
cables "stretch" more than front cables. The greater"sponge" one may
feel when applying rear brakes can arise from rear brake cable housing
making more bends than the front one, especially with tighter bends of
under-bar-tape routing. Curved cable housing is the bane of "cable
stretch" or better, cable housing compression.
As I mentioned, when a cable housing is bent into a curve that causes
permanent curvature (yield), when relaxed gaps open between housing
coils because it now articulates about its central axis rather than
the inside curve coils. Small as they might be, these gaps compress
when the cable is activated and cause what appears to be cable
stretch, while in fact it is housing compression.
I repeat: Cables do not stretch perceptibly from manual brake
activation,
jobst, you're being, at best, imprecise, at worst, deliberately confusing.
when you refer to "The greater"sponge" one may feel when applying rear
brakes", that is *elastic* deformation. it is perceptible and
absolutely /does/ occur from manual activation. the "stretch" which you
[might] correctly be denying is plastic deformation - entirely not the
same thing.
Quoted message said:nor do cable housings compress if they have not been
stretched so that their coils do not nest without clearance. In other
words, the steel coils of the housing do not compress elastically or
plastically from braking.
no jobst, see above. the whole system deforms elastically, wire,
housing, levers, calipers, the lot. none of it deforms plastically of
course, but you don't specify when you use stupidly imprecise language
like "stretch" which could mean either.
Quoted message said:If they did, one could see dents in the
round coil wire upon dissection. They are not to be found.
the only possible explanation for such a statement is that you're
confused about the distinction between elastic and plastic deformation
regimes.
