all front wheels are 10 inch wheels the only thing u should worry about is the offset, and the width, I have carbon fiber wheels on my banshee and thats what i plan to get for my z400, they are excellent wheels, dont chip scratch or dull, and there much much easier to clean. go with a 9 inch tall back wheel, there a good compromise between a 9 inch and a 10, they ride better than a 10, but are easier to find tires for than a the 8 inch wheel and offer a comparible ride. as for tires if your running woods go with the new xcrs from holeshot their excellent, as for mx that opens up a whole new can of worms. too many tires to choose from for mx, each with the own special suite.