Are you asking yourself: "Will this rim fit my tire?"

That's a great question. An easy way to answer this is by looking at your tire and finding the letter "R". For example :

R14= 14" Tire (fits a 14" rim)
R15= 15" Tire (fits a 15" rim)
R16= 16" Tire (fits a 16" rim)
R17= 17" Tire (fits a 17" rim)
R18= 18" Tire (fits a 18" rim)
R19= 19" Tire (fits a 19" rim)
R20= 20" Tire (fits a 20" rim)