Now we're going to talk about replacing your
rear derailleur.
This is pretty simple.
You want to make sure you have the correct
derailleur.
Replacing it with the exact same derailleur
is a good idea.
The reason you want to replace a derailleur
is because it could be worn out.
If you feel the back of the derailleur here
and it shifts back and forth really easily,
usually it means the rivets are worn out.
You can always take it to your local bike
shop and ask them to take a look at it to
see if it's worn out.
To replace a derailleur is pretty simple.
First, you want to take your chain off so
it's easy to get to the derailleur.
The derailleur comes off really easily.
Then you want to pivot the derailleur back
so the B screw is off your derailleur hanger.
Take your five millimeter wrench and unscrew
it.
Then it's off.
You can cut your cable off or undo your cable
and just got off the tip.
Obviously, your chain will be gone so the
derailleur will just be off.
To install a new derailleur, you've got to
be sure that when you're putting it up to
your derailleur hanger, it's going on straight
and also it's not stripping any threads.
It's a lot easier without the change on and
it's a lot easier without the cable on.
If you do already have the chain and cable
already on the derailleur, it's still pretty
easy.
You are going to have to manipulate the derailleur
so that the B screw is lining up with the
spot where it rests right on the derailleur
hanger.
That ensures that the thread is going to be
okay.
Also you want to grease the threads.
Just like the threads on most bicycles, you
want to grease them before you put them on.
I'm just making sure that it's going on nice
and straight.
Making sure it doesn't feel any resistance
so I'm not cross threading it.
Then just tighten it down, making sure that
B screw is above the derailleur hanger.
That's installing a rear derailleur.
