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Chain Stretch
I've been thinking about chain wear, sometimes called chain stretch, and have done a bit of research on the subject. One method is to lay the chain on a flat surface and measure the wear over, perhaps 12 inches of chain length, from the head of one pin to another. But modern multi speed chains are a bit more complex then the old fashioned chains and the rollers on a modern chain are not supported by the pins but by protrusions on the inner surface of the inner links thus does the distance from roller to roller relate to distance from pin to pin? Another method is to ignore the pin to pin distance and simply measure the roller to roller distance using a chain gauge. But I have also read that when comparing roller to roller measurement to pin to pin measurement there is not necessarily a correlation, or in other words a pin to pin measurement might show one thing while the roller to roller might show a totally different wear pattern. In addition I read that in at least one case the roller to roller wear was not constant and varied from place to place in the length of the chain Brandt, I believe, wrote a treatise on chain measuring gauges and argued that nearly all of them gave an incorrect figure for wear, or perhaps, did it the wrong way. So the question is what is the best system to use to avoid unnecessary sprocket wear, assuming that sprockets cost more and are more trouble to change than chains. There seems to be three options. One, to use a ruler and measure from pin to pin. Two to use a chain tool and measure from roller to roller. Or three, to use some combination of the two. Or perhaps there is a fourth - ignore the whole thing as a tempest in a tea pot :-) -- Cheers, John B. |
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