Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Mentioned: 9 Post(s)
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If the double loop is on the same section of chain, or the chain is off the bike, slowly walk one loop along until it merges with the other and both should disappear.
Otherwise, if the wheel or derailleur were removed, it's possible that the RD or cage are rotated 360° creating a loop.
As you say a picture would help, but we can't picture a solution until you post a picture of the problem.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
- Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance