I am thinking about buying the Giant Roam for my firest bike in 16+ years. It was a hard choice between this and the talon 29er but I think the roam will suffice until skill grows and I need or want a more specific type of bike. Now to the question. I will be riding alot of street and a little dirt/trail. I am lazy and do not want to have to change tires on wheels when going campong or trail riding so I want a spare set of wheels with tires for the street. What do I need wheels to fit and I suppose I need a new cassette and disks? Any help would be greatly appriciated.