Hi all, we bought a used bike for our son without much inspection and, yikes! He tried shifting it and the rear derailleur went into the rear wheel. So, I got it running and now want to get it shifting. I do not know much, so any advice is appreciated. First off, the H and L adjustment screws are bent like bananas (see photo). Does anyone know what size they should be so I can replace them? Does this mean the derailleur is dead? Does this alone possibly explain the aforementioned problem, or should I be looking at other things as well? In the end, I'd just like to make sure it is operating fully and smoothly. Thank you!
Inspect & Screw Size Shimano TourneyTX RDTX800
- Thread starter asp1981
- Start date
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I believe, but of course I could be wrong, is that the limit screws are M4 x 18mm. Your local bike shop, LBS, should be able to advise.
The ones on the mech are well mashed for some reason.
There are plenty of videos on YouTube on how to adjust the mech.
cyberknight
As long as I breathe, I attack.
- Location
- Land of confusion
i agree , given how cheap they are i would just replace it and start from scratch and a new gear cable too .As well as that i would look at replacing the chain too and maybe a new cassette too if its too worn to mesh with the new chain .
https://www.amazon.co.uk/SHIMANO-Un...gads-lpcontext&smid=A3P5ROKL5A1OLE&th=1&psc=1
roubaixtuesday
self serving virtue signaller
If the derailleur is into the spokes, it's likely that the hanger is badly bent.
Ajax Bay
Guru
- Location
- East Devon
The reason the RD went into the spokes is because the L limit screw was dysfunctional. The hanger may have been bent in the process but likely not the cause.
The threads in the RD body for the limit screws (per image) will likely be screwed swidt.
Replace (echoing @C_R and @cyberknight advice above) and here's the best option (silver, worry not about the Claris image shared therein) - £14:
https://www.wolfcycles.co.uk/product/shimano-rd-tx800-tourney-tx-rear-derailleur-direct-mount/
Will need a new cable too (but save the current one for the next time you have to replace the/an FD cable).
Check hanger alignment (for verticality in both planes) as part of the (v easy) install - 5 mins.
The threads in the RD body for the limit screws (per image) will likely be screwed swidt.
Replace (echoing @C_R and @cyberknight advice above) and here's the best option (silver, worry not about the Claris image shared therein) - £14:
https://www.wolfcycles.co.uk/product/shimano-rd-tx800-tourney-tx-rear-derailleur-direct-mount/
Will need a new cable too (but save the current one for the next time you have to replace the/an FD cable).
Check hanger alignment (for verticality in both planes) as part of the (v easy) install - 5 mins.
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cyberknight
As long as I breathe, I attack.
- Location
- Land of confusion
hanger is part of the tourney derailleur anyway so not an issue if replacing anyway .
Indeed, these dérailleurs have a claw mount, no hanger to straighten.
figbat
Former slippery scientist
- Location
- South Oxfordshire, UK
Ajax Bay
Guru
- Location
- East Devon
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Has the OP confirmed they have one of those and not a claw one? I thought from the photo it looked like a claw mount, but I'm often wrong.
