Join Date: Dec 2008
Location: Wilmington, NC
Bikes: 2008 Masi Speciale Fixed
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I can at least answer the first one, I did it on mine. There should be a screw, likely on the underside, that you can take out to allow the gripshift to come apart. I don't remember whether I could take it off with the grips still on or if I had to slide it off the end, but you might as well take everything off. GripShifts come with a little short grip that goes after the shifter, and once the shifter's gone that becomes a little stupid looking, so just go buy a regular set of MTB grips before doing it and just change all that out at once.
The rest is more of the same. Take off the front derailleur, and leave the rear unless you've got a chain tensioner handy that you can install. Remove all cables and stuff like that. It's really just as simple as looking for things to unscrew and unscrewing them.