make printout out of what you have now, and what you want to be the end. cross reference the specs so can get a wheel you like that can at a minimum handle what you have now and at maximum can handle what you want. that can get you started on getting the wheels on and going unless of course you are changing diameter as well which if you want get the one you want and used tires that will "fit" for now till you have the money for all new tires.
---------- Post added at 01:37 PM ---------- Previous post was at 01:35 PM ----------
oh just in case you did not know tire companies typically have specs on what rim sizes they will deal with. always look for that.