There is a lot of rim choices on this site. Avoid the really narrow front ones. I would say for more ground clearance use moabs ( http://www2.towerhobbies.com/cgi-bin...I=DTXD62**&P=Z )

As for the radio look on teh back of it where the crystal is. And there should be some some numbers on it. If they are the same you need new crystals but it if they are diff you are good to go.