Need some technical help with my bottom bracket please.

Super Freak

I've noticed that there is a little play in my BB. I have just replaced the chain and cassette and I'm thinking of replacing the chainset. My bike is a couple of years old Trek 4500MTB. I was thinking of replacing just the bottom bracket but now think that replacing the chainset+bottom bracket would be a better idea.

I'm not really sure how to go about this. I'm pretty sure that the current setup is a Shimano Alivio (FC-MC20). Same asTHIS

I have a couple of questions,

Can I upgrade this to something like a Deore chainset? http://chainreactioncycles.com/Models.aspx?ModelID=40496
Do I need to purchase extra bearings or is everything included with a chainset?
What special tools are required?

Photos of the offending item below. (Sorry for not washing the bike):o and thanks for any help.

Morgan

A bottom bracket is included with that chainset (and most external-bearing chainsets).

You'll need a BB cup tool to fit the new bb/crank, like this:
http://www.chainreactioncycles.com/Models.aspx?ModelID=42809

A different tool is required to remove your old one:
http://www.chainreactioncycles.com/Models.aspx?ModelID=14914

Super Freak

Thanks Morgan. Much appreciated.