Given that you can see some internal rust and some cracking on the
sheathing, I'd guess that this housing got pinched or slightly crushed
at some point and it all slowly went downhill from there. Shimano
housing is hard to beat, and I really doubt it was a factory defect.
It's cheap to replace. I wouldn't try to use brake housing for a
derailleur, as it uses larger ferrules which won't fit in your cable
stops. You'd just be asking for more trouble!
On 3/20/2011 10:55 PM, Earl Grey wrote:
Hi,
yesterday, as I shifted my Sam with alacrity into the big chainring,
the left silver shifter went past the limit of its range of motion
determined by the derailer limit screw. I thought perhaps the cable
had slipped, but then saw that the housing had burst in the loop
coming from the bar-end shifter:
http://www.flickr.com/photos/gernothuber/5545443939/
This is 1.5 year old silver gray Shimano SIS SD housing purchased from
Riv.
I have never burst derailer housing, nor have I ever heard of it
happening to others. Was this a manufacturing defect, low quality
housing, or caused by UV damage, which the gray housing is presumably
more subject to than black housing? Fortunately there remained enough
tension on the cable that I could move the derailer cage by hand to
shift and have it stay in place over the middle chainring.
Has anyone had a similar experience? There is some sign of rust inside
the housing, pointing towards a slow failure, probably starting with a
crack in the gray housing. The gray outer covering on the tight loop
leading to the rear derailer is also cracked. The bike is always
parked in the car port, and is only subject to direct sunlight when I
am riding or when it's parked outside the yoga studio or on errands
(about 8 hours a week).
I like the look of the silver, but if I have to replace the housing
once a year, I'll probably go with black housing, of which I have a
spool. Or should I go with silver gray *brake* housing, since I only
use friction shifting anyway?
Thanks,
Gernot
Cheers,
Gernot
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