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I need to buy a Shimano RD-TZ30 bike rear derailleur for my son's Columbia Trail Head 24. Do they still make them and if not, is there a substitute for it? Thanks
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The semi-circular spacer is what holds the derailleur in the dropout. Take the part that looks like a "C" and line it up on the drop out, the spacer goes on the other side of the dropout. There should be a screw that fastens to the spacer and clamps the derailleur to the drop out.
the half circle nut needs to be loosened up, slide the whole lot of it into the rear dropout until it stops, tighten up the bolt to the nut and make sure the dropout slots match up with the derailleur dropout slots and you should be ready to go. Install your back wheel, chain and cable.
Perhaps you have a tight link. Is it always the same place on the chain. Can you duplicate the problem in a static setting, say, with the bike suspended so you can 'pedal' it and observe what is happening at the rear?
Broken inner plate can be a potential warranty. Contact your local bike shop and they can process the warranty for you, if it isn't a warranty then the same shop can order you a new plate.
The deraileur should have two screws on the right side (facing you when you look at the derailleur) try making the screws tighter or looser to tune the derailleur.
Techdocs.shimano.com is a very good source of installation diagrams and information. Although THIS LINK is not to your precise model (TZ50, not TZ30), this will get you the info you need. Visit the Shimano technical documents address at the beginning of this message to browse all the tech sheets.
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