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Percentage chain wear for ROHLOFF
PRP:
Hello . What is the maximum chain wear percentage (0.5%,0.75%, 1.0%) ,for ROHLOFF drive train that permits fitting a NEW chain that will mesh with the existing chainring & sprocket without chainring& sprocket rotation??
I am wanting to MAXIMIZE chainring & sprocket life before needing rotation .
Comments Thankyou PRP
Matt2matt2002:
Lots of posts here on this subject.
I stick to 0.75 to change the chain.
It's cheaper that the front and rear cogs.
And quicker.
But a lose chain is quite ok to run on.
Lose and worn aren't the same thing of course.
martinf:
I agree with 0.75% for a Rohloff drivetrain with 16T sprocket or bigger, same as for derailleur bikes. My experience with Brompton folders makes me think that it might be different for small rear sprockets.
But if you can be bothered to go further with the optimisation business, run several chains in alternance on one sprocket, then flip the sprocket and repeat.
Explanation:
Chain 1 with sprocket. Run until cleaning, or for xxx km.
Then fit new chain 2. Run as above to xxx km
Then fit new chain 3. Ditto.
Then fit chain 1 again, which has been cleaned and relubed in the meantime.
And repeat with chain 2 and 3.
Keep doing this until the sprocket and chainring are worn.
Flip sprocket and chainring and start again.
I have done variants of this procedure in the past, with xxx between 500 and 800 kms, but do not bother anymore as I now have Chaingliders on most of the family bikes.
mickeg:
--- Quote from: PRP on September 23, 2018, 11:06:31 am ---Hello . What is the maximum chain wear percentage (0.5%,0.75%, 1.0%) ,for ROHLOFF drive train that permits fitting a NEW chain that will mesh with the existing chainring & sprocket without chainring& sprocket rotation??
I am wanting to MAXIMIZE chainring & sprocket life before needing rotation .
Comments Thankyou PRP
--- End quote ---
I think you are trying to say that you want to go as long as you can before you replace the chain with a goal of minimizing chainring and sprocket replacements.
But the more worn a chain is, the faster it will wear down the chainring and sprocket, so it is a balancing act where buying more chains in the long run would result in buying fewer chainrings and sprockets.
Does anybody know the exact best chain stretch (elongation) to use for that balancing act? I do not know. For derailleur bikes I assume it is 0.75 percent and I have no reason to think that it is any different for an IGH bike so I assume that too.
For derailleur bikes, some people that assumed they could get a cassette to last as long as two or three chains have gone to the extreme of frequently changing their two or three chains with each other so that they can have two or three chains that are all in a similar state of elongation until they replace the cassette and also replace those two or three chains simultaneously with the cassette. That is more work than I want to do.
martinf:
--- Quote from: mickeg on September 23, 2018, 02:48:40 pm ---For derailleur bikes, some people that assumed they could get a cassette to last as long as two or three chains have gone to the extreme of frequently changing their two or three chains with each other so that they can have two or three chains that are all in a similar state of elongation until they replace the cassette and also replace those two or three chains simultaneously with the cassette. That is more work than I want to do.
--- End quote ---
Done that, generally with two chains but sometimes with three. I found it worthwhile when running a derailleur bike as a commuter, but only because I used to remove chains fairly frequently for cleaning, they picked up a lot of muck in wet weather.
I'd take the dirty chain off when needed, wipe sprockets/chainring/derailleurs and put a clean chain on. Then clean/relube when convenient, often waiting till I had two or more chains to clean.
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