In article <pan.2004.07.25.23.18.41.789338@cyclist>, Commuter Cyclist
<
[email protected]> writes:
>Is there a quick way to find this posting? Does someone have the MSGID or
>other details to find it? Searching for messages from tbgibb didn't work.
Here it is:
To interject some real data into the chain lubrication debate I devised the
following method for comparing two methods.
1. Take one PC-48 chain, size it for the bike and then "break" it into two
equal sections
2. Join the two sections with second "Power Link."
3. Mark a section by cutting a shallow "+" sign in a rivet with a Dremel and a
cut off wheel so the individual chain sections would always be cleaned by the
same method.
4. Clean one section (called "washed") by thrashing it in paint thinner,
changing the thinner until there is a clean wash. It took 5-6 to do this. I
always used fresh (instead of thinner that was being reused by allowing it to
settle prior to being filtered through a coffee filter) thinner for the last
2-3 washes.
5. Clean the other section (called "unwashed") by throughly wiping it off with
a rag and then brushing it with a tooth brush.
6. Otherwise treat both sections exactly the same oiling both with Quaker State
chain saw bar oil.
7. Measure the chain sections as follows:
a. hang the chain section with a five pound weight on it (a set of
automobile cable chains).
b. measure with an 18 inch ruler that is ruled to 1/32 in the first inch.
Using that long a ruler allowed us to measure between the 1 inch
mark and the 13 inch mark so we could use that first inch and
extrapolate to 1/64.
c. have my wife confirm the measurements (we argued about them several
times).
8. Put the chain back together, oil it, wipe it down to remove excess oil,
replace it on the bike and ride it until the chain needs cleaning again.
9. Repeat until 24 links in one section measures 12 1/16.
Results:
Date Miles Elongation Elongation Notes
of washed of unwashed
chain chain
07/11/03 0
07/14/03 137.1 0 0 Dusty and
noisy
07/23/03 328.6 1/64 1/64 Dusty and
slightly noisy
08/01/03 607.24 1/64 1/64
08/11/03 819.71 1/64 1/64
09/02/03 1076.67 1/64 1/32
rain
09/19/03 1430.39 1/64 1/32
noisy
10/23/03 1801.17 3/64 1/32
11/07/03 2257.55 3/64 1/32
01/05/04 2739.52 1/16 1/32
Very dirty and noisy
Conclusions:
It isn't worth it to soak a chain out in solvent. I've stopped doing so, but I
will be very careful to measure often.
The presence of my wife Susan (an unbiased observer) in this was essential, I
(she) caught myself (me) seeing more wear in the "unwashed" chain than in the
"washed" one early in the trial.
Comments:
It was not easy to measure the chain to the 1/64 level, we spent some time
getting the light right so we could see the marks and either took the glasses
off (Susan) or used 4X readers (me) and we still had to work at it.
I used a needed fresh cassette at the begining.
The bike was my "beater" bike, a Cannondale M700. I use it for commuting and
errands. Part of the riding was on gravel trails.
The method could easily be used to compare other cleaning methods and other
lubricants.
I was prepared to take SRAM to task for advocating cleaning chains by wiping
them down with some kind of degreaser on the rag (trying to sell extra chains
are you?) HA! or NOT!
Tom Gibb <
[email protected]>
Tom Gibb <
[email protected]>
