My fron tires are gone. i need new ones bad but i dont know what kind to get and what size to get. I have a 99 4ooex guys let me know. I was lookin at the razor's, any good?? what do these #'s mean on the tire 21-7-10? 21?7?10????

 

21 is how big the tire is from top to bottom, 7 is the width of the tire from left to right, 10 is the size wheel that it will fit on (10 is the inner diameter)