Quote:
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Originally Posted by jonboy
Quote:
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Originally Posted by cosmiccharlie
...but 'tightspots' what are they ?
Are they links that are a little stiffer than others or what?
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Yes, it's where a link doesn't move around it's pins sufficiently and therefore is stiff and temporarily shortens a section of chain as it goes around the sprocket causing undue wear on the sprocket bearings.
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A tight spot doesn't necessarily mean stiff links. When a section on chain is worn more than another, the less-worn section is the tight spot. A section where the pins and/or the holes in the plates are worn more than in another means the chain has effectively stretched - the pin to pin distance has increased. This is when the sprocket wear really accelerates. Another wear test is to see how far you can lift the chain off the back edge of the rear sprocket. You shouldn't be able to lift it much at all on a new chain - perhaps a millimeter or two. Extremes of this sort of stretching are dangerous, as under load, the chain will climb up the teeth and possibly jump off the top if it's very worn.