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chain un-stretch?
i have been measuring chain stretch on my shimano chain.
8 speed sora components. i think it;s an "hg" style chain. i replaced it at 3000 miles. so these measurements start at 3000 miles. at 3600 miles, i logged 0.8/16" stretch at 4000 miles, 1.0/16" at 4300 miles, 0.1/16" at 4555, 0.1/16" you might think there has been a change in measurement procedure. yes, but if anything, it should measure more lengthening in the later measurements. i now put the chain under a lot of tension when measuring this. i am pretty sure the measurements are right, but what are they measuring? i do try to keep it pretty clean. i use the absolute thinnest lubricants, silicone spray and powdered ptfe. i do ride a lot, probably 100-150 miles a week on that bike. could it be that dirt or rust or something has built up on the rollers, taking up the slack for what must still surely be 1/16 worth of wear? should i just not worry until i can measure 1/16 again? should i just say, ok, well that chain has gone 1500 miles, time to replace it, if it;s gone that long and is measuring all screwy like that? wle. |
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#2
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chain un-stretch?
larry english wrote:
could it be that dirt or rust or something has built up on the rollers, taking up the slack for what must still surely be 1/16 worth of wear? That's certainly possible in theory, there is a comprehensive web page on the subject of chain suck which aruges convincingly (to me) that dirt-induced chain 'shrink' can be a major factor in this phenomenon (typically when a new chain is used on slightly worn chainrings, a mistake I have made in the past). This is however more likely with muddy MTB conditions, I couldn't say how likely it is to be the case in your situation. James |
#3
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chain un-stretch?
James Annan wrote in message ...
larry english wrote: could it be that dirt or rust or something has built up on the rollers, taking up the slack for what must still surely be 1/16 worth of wear? That's certainly possible in theory, there is a comprehensive web page on the subject of chain suck which aruges convincingly (to me) that dirt-induced chain 'shrink' can be a major factor in this phenomenon (typically when a new chain is used on slightly worn chainrings, a mistake I have made in the past). This is however more likely with muddy MTB conditions, I couldn't say how likely it is to be the case in your situation. right, there has been zero mud, and i am not using a sticky or gunky lube. wle. James |
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