Re: Add water; watch chain grow.
- From: jobst.brandt@xxxxxxxxxxxxxxxxxx
- Date: 31 Dec 2005 19:00:47 GMT
Lucas Iragusa writes:
> Not sure if this is attributable to the lingering effects of a
> misspent youth, but over the years I've noticed that my fixies and
> single speeders exhibit a marked increase in chain slack directly
> following a thoroughly drenching ride.
My first inclination is to ask, how did you assess the change in chain
length? Did you measure it or derive it from other effects? Just in
case you haven't seen this, you can measure chain pitch, the criterion
of chain wear, by laying a ruler along the longer exposed run of the
chain (on the bicycle) with an inch mark adjacent to a rivet and
glance at how far off the rivet at 12 inches farther down the chain
is. This is more accurate than chain wear tools that essentially
measure roller clearance along with chain pitch.
> Typically the chains were not clean or well lubed prior to their
> protracted soaking. I suspect that the water, in lubricating and
> cleansing the chain's links, facilitated their conforming to a more
> direct line when not engaged by the chainring or cog, the effect of
> which, post-deluge, is the illusion of greater relative chain
> length. Is this analysis correct?
I think you'll find that unless the chain is slack, dirt on and around
the chain has no effect on pitch measurements. Measure the chain. A
1/16" per foot is 0.5% wear, a reasonable measure for installing a new
chain.
Jobst Brandt
.
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