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#1
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muck on chainring/sprocket on 1SP/internal gear hub bikes
Almost always there is a pattern of dirt, like
the "negative" of the chain, on the chainring/sprocket. This is often very loose, a wood stick and then rotation will remove most of it in but a few rotations. Question is how much this really influence anything? Once removed, there is a slightly better feel to pedaling - but I don't know, maybe it is all psychological? -- underground experts united http://user.it.uu.se/~embe8573 |
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#2
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muck on chainring/sprocket on 1SP/internal gear hub bikes
On 18-02-18 01:26, Emanuel Berg wrote:
Almost always there is a pattern of dirt, like the "negative" of the chain, on the chainring/sprocket. This is often very loose, a wood stick and then rotation will remove most of it in but a few rotations. Question is how much this really influence anything? Once removed, there is a slightly better feel to pedaling - but I don't know, maybe it is all psychological? I seem to remember Jobst Brandt many years ago writing that there was no need to clean the cogs and chainrings, because the chain would always clear out the area it needed to contact. However, I couldn't find this text just now with a Google search. In any event, I don't bother cleaning the sprockets or chainrings. Jobst also wrote that it's necessary to remove the chain and shake it in a bath of solvent before lubricating. I used to do this (when I retired a parting gift from colleagues was several liters of hexane), but no longer bother. My impression is that chain life is still fine, and I no longer feel pangs of conscience because of air pollution caused by the rapidly evaporating hexane (it's extremely volatile). And just a warning to anyone who uses hexane as a solvent: There is a disease called hexane neuropathy. It used to occur in truck mechanics, who often got it on their hands and wrists while using hexane spray to degrease truck brakes. The hexane would interact with a neuronal protein called neurofilament, damaging the axons in the nerves leading to and from the hands and producing lack of sensation and motor problems. Ned |
#3
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muck on chainring/sprocket on 1SP/internal gear hub bikes
Ned Mantei wrote:
I seem to remember Jobst Brandt many years ago writing that there was no need to clean the cogs and chainrings, because the chain would always clear out the area it needed to contact. This was my intuition as well. Anyway interesting post - yeah, better stay clear of hexane -- underground experts united http://user.it.uu.se/~embe8573 |
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