Eric Zamora said:I just visited my two favorite local bike shops today looking for new brake and derailleur cables
for my 1983 bianchi road bike. At the moment, I have some thick 1.8 cables, probably campagnolo.
The only thing these two shops had to offer me were shimano cables which appear to be very thin
and some off brand options, also thin. These ran from $1.99-$2.99 each.
Quoted message said:What gives? I always thought thicker cables were best, especially for brakes (I have modolo
speedys). Anybody care to chime in on their thoughts regarding cable thickness? one guy at one
shop said "cables are all the same..." and this is from one of the two pro shops in town.
the reply that:
# Actually, the best cables for high tension applications are braided (which you thicker cables
# probably were).
Is bad advice. Cables with braided strands were developed for shift cables for bar-end shifters or
STI, both of which change radii from steering while riding. STI shift housing is probably stiff
enough to make braided or unbraided unimportant, the braided strands being more flexible. The
reason this is bad advice is that the finer the individual cable strand the faster the cable will
fail from wear.
draco.acs.uci.edu8f.2.htmlOpen ↗
Cables strands are wound helically so that bending the cable will not change its length. That is,
all strands pass through the inside and outside of each bend. This means that strand wear on the
inside of cable bends, as the cable slides around the bend under load, is the same for all strands.
Therefore, when one strand wears about half way through, the whole cable fails since that is when
strands crack and fail. This rule holds true for braided single stands as well, only that the tiny
strands wear through about 8 times sooner having about
1/8 the major strand diameter.
Jobst Brandt [email hidden] Palo Alto CA