Thanks for the comment Louie . These tires require a 2.2" wheel to be mounted on. Whatever wheels he gets, make sure he goes with all 4 REAR wheels. The wheels labelled front are for 2WD trucks and will not work with a 4WD. The wheels I got come in black and white, which can be painted. They will fit an STX for sure. The inner hex fits right on the hub (12mm?), but you use the supplied washer to make the hole a smaller diameter. They come with an adapter kit for a variety of hubs.

Follow the links for the part #s.

Link to tires - http://www2.towerhobbies.com/cgi-bin...&I=LXUM93&P=ML


Link to wheels - http://www2.towerhobbies.com/cgi-bin...?&I=LXM875&P=7