Cycling Equipment · Public discussion

Rear Derailleur.

Started by RenatDavodov · · Last activity · 2 posts · 703 views

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Cycling Equipment
Published
16 October 2011
Last activity
17 October 2011
Original author
RenatDavodov
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Rear derailleurs

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  1. Original post
    RenatDavodov
    Archived post
    #1

    Hi all,

    First of all, sorry if I am in the wrong section, I am first time on this forum ^^

    I have a normal `mountain` bike for every day cycling...Yesterday, during the ride, my rear derailleur snaped....
    Me having no idea in bikes, I am looking after some help.
    I found "Shimano Tourney Rear Derailleur RDTX31G" on amazon for 10 pounds but I have no idea how they differ and will it fit my bike?
    I have 6 `cogs` on the back which would mean 6 gears?

    My questions are, will this part fit or which would and which would not?
    What else will I require to change it, any other parts needed?
    Will I need to buy a new chain or just buy chain disassemble tool and re clamp it back?
    What tools will be required? Because I live in uni and I dont have my tools with me, so I will have to purchase them.

    I am trying to fix my bike as cheap as possible so please bear this in mind.

    Thank you, hope to hear some help from you guys

    P.S - Picture attached just in case anyone wants to see it.

    [IMG]cyclingforums.com263[/IMG]

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  2. dabac
    Archived post
    #2

    The RDTX31G won't work, as it needs a threaded hole to bolt on to(AKA derailer hanger), which your bike hasn't got.
    You need RDTX51B, or RDTX35B or TZ50B. Or some other model which gets clamped under the axle nut.

    If your current derailer/shifter is Shimano, then one of the above will work. If your current stuff isn't shimano the odds are still really good, but not a given.

    You'll need a wrench to undo the axle nuts, a screw driver to undo the derailer retaining screw. Probably an Allen key to release the cable from the clamp. Probably an Allen key to open derailer cages.

    Remove the rear wheel, unclamp the shifter wire. Loosen the screw immediately to the rear of where the axle nut was and remove the old derailer. Open derailer cage to free the chain. Try to remember how it ran.

    Loosen(don't remove) same screw on new derailer, slide new derailer in. Tighten screw. Pop rear wheel back in. Align wheel and tighten the axle nuts. Open derailer cage, make note of which wheel goes where in case you should drop them. Thread chain back in. Close derailer cage. Hook up shifter cable with the shifter in the position that provides most slack cable.

    Then head over here: sheldonbrown.comderailer adjustment.html to read up on how to adjust the shifting.

    Do note that you may need a new, longer shifter cable to go with your slightly different rear derailer. Maybe even a new rear housing.

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