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Chaining slipping in smallest cog...need help!

15K views 80 replies 26 participants last post by  tommyc  
#1 ·
It's started jumping when on the lowest cog. Although I can't see it jumping when riding, when under load, the chain feels and sounds like it's slipping off the smallest cog for a second, and then back on. Other than that, shifting is fine in all other cogs. When on the bikestand, everything seems fine. The chain makes no noise when on the smallest cog, so I think indexing and limit screw are correct. Some details:

It's a Shimano XT8000, 1x11 setup, 11-46 in the back. Chain is Wipperman, with the quick-link, and yes, the link is on correctly, I use hot wax on the chain. I don't see any stuck links, although after waxing, the links are stiff. I "break" the links, and then go riding. Even after 20 miles of riding, the chain still "jumps."

Chain, cassette, chainrings and cable have about 800 miles, all changed at the same time. Chain is not worn out, I measured with both the two-prong and the three prong Park chain stretch tool, and also measured with a ruler. Shifter and derailleur are about 6 years old, about 9000 miles total. Derailleur is XT8000 long cage. The bike can use the regular cage, but the previous owner for some reason had it built with the long cage. It has a clutch, which I have set to On.

I've used this setup for thousands of miles and never had a problem. I am considering trying a new chain, then a new regular cage derailleur. I read somewhere it could be s slipping free hub. I read that a defective free hub would start slipping on the smallest cog, and later on the others. Is that true, and why?

I don't find myself using the smallest cog often.
 
#81 ·
I had the same issue a few weeks back. I wax my chain so I'm removing my chain every ~175 miles. I always made sure the arrow on the quick link was pointing to correct direction but never really noticed the straight and curved sides of the link. I learned that the curved side needs to go on the inside(towards the chainring/cassette). Once I fixed that, the skipping
stopped.
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