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gear skip

Old 03-18-11, 11:39 AM
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gear skip

Hello, When trying to shift from the highest to 2nd highest gear on my bike, the chain automatically skips one gear to the third highest(1st - 3rd). I've tried thightning the cord on the rear derailleur with no results. I've also tried the barrel adjustor on the derailleur, also with no results. I shift with thumb switch. Any suggestions would be appreciated. Thanks.
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Old 03-18-11, 06:12 PM
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Two possibilities come to mind.

1. When chain is is jumping a cog when shifting from smallest ring, it usually means cable is too tight, not too loose, so tightening the cable either by disconnecting and pulling out slack or with barrel adjuster exacerbates problem. Shift one click then, while turning crank, turn barrel adjuster slowly to loosen cable until chain settles back the second cog. Alternatively, with chain on the smallest cog, stand behind bike an check to see where derailleur cage is relative to cog. If not directly underneath the smallest cog (if cable is too tight the pulleys will be off a bit to the inboard side), loosen cable a bit with adjuster until the pulleys line up with the cog. Then click once to get chain on second cog and again ensure pulleys line up directly underneath 2nd cog via small turns of the barrel adjuster. No need to repat with rest of cogs, checking alignment with smalles two cogs should be sufficient to dial in shifting.

2. If too much cable tension is not the problem, it could be shifting technique. With trigger shifters, its pretty easy to over-shift when shifting from small cog to larger cog in the rear. Try being a bit gentler when pushing the trigger shifter to ensure you are getting just one click of the shifter with each shift.
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Old 03-18-11, 07:48 PM
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How many rear cogs do you have? The more rear cogs the pickier derailleurs are about having perfect derailleur hanger alignment. On a 7-speed I can eyeball alignment adequately. On a 9 or 10-speed I have to use an alignment gauge.
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Old 03-18-11, 09:22 PM
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Originally Posted by Retro Grouch
How many rear cogs do you have? The more rear cogs the pickier derailleurs are about having perfect derailleur hanger alignment. On a 7-speed I can eyeball alignment adequately. On a 9 or 10-speed I have to use an alignment gauge.
Try aligning a ****ty AL hanger for 11 speed.

****.
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Old 03-18-11, 09:28 PM
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Originally Posted by Retro Grouch
The more rear cogs the pickier derailleurs are about having perfect derailleur hanger alignment.
I concur. If you can't tweak the cable tension so you can consistently single-step up and down the gears, it usually means something is bent. Usually it's the derailleur hanger, sometimes it's the derailleur. Another possibility is a worn out jockey wheel on the derailleur--either it wobbles from side to side on its bushing or the chain can't get properly seated on it.
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Old 03-22-11, 02:59 AM
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reply

Originally Posted by DOS
Two possibilities come to mind.

1. When chain is is jumping a cog when shifting from smallest ring, it usually means cable is too tight, not too loose, so tightening the cable either by disconnecting and pulling out slack or with barrel adjuster exacerbates problem. Shift one click then, while turning crank, turn barrel adjuster slowly to loosen cable until chain settles back the second cog. Alternatively, with chain on the smallest cog, stand behind bike an check to see where derailleur cage is relative to cog. If not directly underneath the smallest cog (if cable is too tight the pulleys will be off a bit to the inboard side), loosen cable a bit with adjuster until the pulleys line up with the cog. Then click once to get chain on second cog and again ensure pulleys line up directly underneath 2nd cog via small turns of the barrel adjuster. No need to repat with rest of cogs, checking alignment with smalles two cogs should be sufficient to dial in shifting.

2. If too much cable tension is not the problem, it could be shifting technique. With trigger shifters, its pretty easy to over-shift when shifting from small cog to larger cog in the rear. Try being a bit gentler when pushing the trigger shifter to ensure you are getting just one click of the shifter with each shift.



Thanks, that did it.
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