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Chain Skip Problem

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Chain Skip Problem

Old 09-12-22, 06:40 PM
  #1  
oldukbkr 
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Chain Skip Problem

I am a newbie to the single speed world. I mostly ride and repair old school road bikes so am familiar with derailleurs, etc. I recently built up an old 40s road frame with a 3 speed Sturmey Archer hub, a brand new SA cog, a chain tensioner, and a new 1/2 x 1/8 single speed chain. I don't have the correct crankset for this yet so I temporarily used a 53T chainring I had handy.

I know this isn't single speed but its a single cog and I figure one of you may know what I'm doing wrong The drivetrain runs smoothly on the stand. But when I took it for a test ride, the chain skips on the rear cog. I've attached some photos. My best guess is the combination of too large a chainring (being higher than the cog) together with the chain tensioner is allowing the chain to climb up the teeth on top of the cog such that at the back of the cog the chain ends up sitting on top of the teeth until it skips down into place. Am I on the right track or is there something else obvious I'm missing here? The chainline looks good and the chain is centered on the cog, i.e. side of links not catching on cog.

Not knowing any better, I basically replicated what I know from my multi-speed world - big ring, small cog and chain tensioner in place of derailleur and now I'm puzzled why this doesn't work.






Thanks
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Old 09-12-22, 09:24 PM
  #2  
TejanoTrackie 
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Try removing some links from the chain, such that the tensioner pully moves forward and the cog catches the chain at a lower point.
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Old 09-12-22, 10:33 PM
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it looks like your tensioner is too slack. I'd remove some links from the chain and run the tensioner more horizontal at maybe 45 degrees so it catches the chain once it's fully engaged to the cog.
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Old 09-13-22, 07:45 AM
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Makes sense. Thanks both for quick reply
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