I'd like to upgrade the chainset on my GT Avalanche 1.0 2013 so I have no front mech or shifter and just one ring on the front; just 10 gears instead of 30.
My current chainset is a Shimano M522 Octalink triple with a Shimano es52 BB and a Shimano HG81 10spd cassette and I'd like to upgrade to a Shimano Zee 10sp M640 with an m980 xtr bottom bracket (or similar), so essentially just 10 gears instead of 30. I believe the shell on the bike is 68mm.
In my case, I understand there is a difference between the BBs, is it just a straight swap of the BBs and disconnect of the front mech/shifter, assuming I have the correct tools?
Would I also have to change my cassette and chain? Maybe even the rear shifter and mech?