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I read the related post, but my situation is a bit different. Additional background - I installed new 105 shifters and derailleurs two years ago (~5000 miles) along with chain and cassette. I also had a 53T chain ring put on in 2013. All was good. Had slight hang-up with slack shifting (to higher gears) on rear cogs this spring, so I replaced the cable and sheaths to the rear derailleur. All was good again. The bearings in my freewheel started making noise last week. Which brings me to the present.

I just replaced the rear wheel, cassette and chain on my 30-speed road bike. The derailleurs shift perfectly and the chain travel when pedalling is smooth and quiet. However when I stand up or dig in on a hill the chain will skip on the cassette. It happens on all THREE chain rings in the front and the spectrum of cogs on the cassette. I thought sure it was a stiff link in the chain, but could not find an issue with it when manually flexing each link. I tweaked the rear derailleur to the point of shifting cogs in both directions and still have the issue. Any suggestions?

marked as duplicate by andy256, Gary.Ray Sep 9 '15 at 0:44

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Welcome to Bicycles @Brad. On the desktop version of the site, as your typed you question you would see a list of similar questions pop up on the right. They are still there now, and they answer you question. – andy256 Sep 8 '15 at 23:06
  • Stupid question: When you replaced the chain, did you get the right width? – Daniel R Hicks Sep 8 '15 at 23:39
  • Good question Daniel. I dug the chain box out of recycling to confirm, it is a 10 speed chain which matches the cassette, derailleur and shifter. It is a Tiagra chain which I bought in a pinch at LBS when I realized I didn't have a spare in my home "stock". Also didn't realize the 10 speed cassette I had at home was Ultegra. I have an Ultegra chain coming later this week, we'll see if that helps. – Brad Johnson Sep 9 '15 at 18:17
  • I started to wonder if I got the wrong chain in the right box, but Shimano stamps the number on the chain itself, CN-4601 - Tiagra 10-speed. – Brad Johnson Sep 9 '15 at 18:25
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    The top answer to the linked question suggests checking the derailleur hanger alignment and the chain length. The next answer suggests looking at cable tension. These can be frustrating problems; keep working at it, and update your post again or ask a new question as you narrow the problem down. – andy256 Sep 9 '15 at 22:06
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Since you replaced the cassette and chain already, it could be your (front) chainrings that the chain is skipping on.

Check if the teeth are significantly worn (shark tooth shaped) and if the chain rides up the teeth under torque. If thats, the case, then your chainrings may need replacing.

  • It would be very unusual for all three chainrings to be worn out. – Daniel R Hicks Sep 8 '15 at 23:40
  • The skipping is basically cog/chain ring independent. It happens in every combination I tried, which is why I'm leaning toward a chain issue. It's definitely skipping in the rear not the front, although I've had mashed chain rings (riding rock gardens on my mtb) cause phantom shifts in the rear, so I understand what you are suggesting. I haven't done any rock gardens with my road bike recently, and my big ring (53T) is only two years old, so I don't think they are the problem. – Brad Johnson Sep 9 '15 at 18:23

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