Having a weird self shifting action on the rear
08-27-08, 10:11 AM
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Having a weird self shifting action on the rear
on road regular pace just all of a sudden it will just start jumping up one down one then after a few it will do it again. Seems to happen even when just barely pedaling .
08-27-08, 10:19 AM
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you need to adjust the rear dérailleur cable turn the adjustment barrel 1/4 at a time until things settle back down again.
08-27-08, 10:25 AM
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I appreciate the tip will let you know how it goes 
08-27-08, 11:34 AM
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Bikeman is probably correct, but if the shift cable adjustment doesn't fix the problem you may have a bent derailleur hanger.
Al
Al
08-27-08, 01:25 PM
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turned and tested
I took your advise and tested it for a couple blocks and it felt a lot better still just a little bit of chatter but I could kick hard without any slipping and virtually no noise other than that little chatter. Thanx a lot this why I will be on these forums for a long time to come you really know your stuff
08-27-08, 01:55 PM
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Thank You
Al , thanx for the help fortunately I think that small adjustment may have gotten it until I beat it up again:
Last edited by Desertsasquach; 08-27-08 at 01:55 PM. Reason: forgot to name al for his response
08-27-08, 07:29 PM
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Ride home test
My ride home produced winning results from the adjustment that you recommended . Not one off shift , though the chain is not quite centered on cassette so that is where my chatter is coming from had the usual 4 miles to test it. There are 2 adjustment screws one has an H next to it . How can I find out what each ones job is ? When I made the adjustment I turned them both to the left that 1/4 turn like you said ...
08-27-08, 11:07 PM
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The two screws are the high and low limit sets for the rear derailleur. You shouldn't have to mess with those unless your chain is falling off the top or bottom sprocket or your getting some clak in your biggest or smallest sprocket. Cable slack is the problem you were identifying. Thats is remedied with the barrell adjuster which is a tiny knob right were the cable enters the derailleur. Turn it a quarter to a half a turn counter clockwise to take the slack out and hopefully make everything stop chattering and jumping around.
08-28-08, 01:39 AM
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I had the same problem and it was a worn chain and rear cluster. Replacing both fixed it.
08-28-08, 08:06 AM
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My ride home produced winning results from the adjustment that you recommended . Not one off shift , though the chain is not quite centered on cassette so that is where my chatter is coming from had the usual 4 miles to test it. There are 2 adjustment screws one has an H next to it . How can I find out what each ones job is ? When I made the adjustment I turned them both to the left that 1/4 turn like you said ...
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Stuart Black
Plan Epsilon Around Lake Michigan in the era of Covid
Old School…When It Wasn’t Ancient bikepacking
Gold Fever Three days of dirt in Colorado
Pokin' around the Poconos A cold ride around Lake Erie
Dinosaurs in Colorado A mountain bike guide to the Purgatory Canyon dinosaur trackway
Solo Without Pie. The search for pie in the Midwest.
Picking the Scablands. Washington and Oregon, 2005. Pie and spiders on the Columbia River!
