Assistance needed choosing new derailleur

Hi guys,
I have a 2002 Scott Voltage MX5, a basic bike with basic Shimano Tourney eqiupment. Now, I would like to upgrade rear derailleur with the one from Alivio or Deore group set. I was wondering if any 7-gear derailleur would fit to my bike and are there any other parts that would have to be replaced, such as rear shifter.
I would appreciate any help,
Cheers
I have a 2002 Scott Voltage MX5, a basic bike with basic Shimano Tourney eqiupment. Now, I would like to upgrade rear derailleur with the one from Alivio or Deore group set. I was wondering if any 7-gear derailleur would fit to my bike and are there any other parts that would have to be replaced, such as rear shifter.
I would appreciate any help,
Cheers
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There is no secret ingredient - Kung Fu Panda
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There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
Thanks a lot
I thought I could reuse this topic for a quick question. Could someone tell me what is this object marked in red? What it does, what it's called etc? I have never seer something similar on other derailleurs.
Thanks
Very common.
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
Parktools
This is Shimano XT, RD-M771 SGS but this is one of the few pictures that show that bit. It even covers Shimano writing
There is no secret ingredient - Kung Fu Panda
London Calling on Facebook
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Duster
My Bianchi
Thanks guys.