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The rear tire requires a BIG socket. I think it's 46mm, ( 1-13/16 ?) but somebody check me on that. The Sprocket is fairly straight forward. Any metric socket set will have all you need, unless you need to split the chain. There's a tool for splitting the chain that makes life much easier. Oh, and a couple of hex keys and the spanner from your tool kit for adjusting the chain, and a pair of pliers.
If you are going to change the front sprocket then you will need a 36mm socket as well.
If you are changing the rear sprocket you may need a longer or shorter chain, and it's usually a good idea to replace them anyway if there's quite a few miles on it.
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