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I've been a bit stupid and removed the large and middle chainrings for cleaning on my Specialized Secteur Sport without noting which position the middle chain ring was in.
The large chainring was obvious because it has a stub which sticks out to prevent the chain from getting caught between the chainring and the crank arm. However there was no obvious mark on the middle chainring so I just went ahead and removed it thinking it wouldn't matter how I put it back on.
I am now getting chain suck when down shifting under load from the large to the middle chain ring, and after checking Sheldon and his reference to Jonathan Levy it appears the problem might be because the middle chain ring is out of teeth alignment with the large one. I have checked the chain for wear and I am just approaching the 1/16" mark so I don't think chain wear is the issue yet.
So I have the option of rotating the middle chain ring one position at a time but with four potential positions to try this may take a while as the chain does not suck on every down shift, it's probably one in 20.
Does anyone know of a quicker/easier way to work this out or is it simply trial and error and a few more scratches on the chain stay due to the chain jamming?
The large chainring was obvious because it has a stub which sticks out to prevent the chain from getting caught between the chainring and the crank arm. However there was no obvious mark on the middle chainring so I just went ahead and removed it thinking it wouldn't matter how I put it back on.
I am now getting chain suck when down shifting under load from the large to the middle chain ring, and after checking Sheldon and his reference to Jonathan Levy it appears the problem might be because the middle chain ring is out of teeth alignment with the large one. I have checked the chain for wear and I am just approaching the 1/16" mark so I don't think chain wear is the issue yet.
So I have the option of rotating the middle chain ring one position at a time but with four potential positions to try this may take a while as the chain does not suck on every down shift, it's probably one in 20.
Does anyone know of a quicker/easier way to work this out or is it simply trial and error and a few more scratches on the chain stay due to the chain jamming?