Bike rim equals ETRTO 559x18 what size tires fit?

For a bike rim with an ETRTO size of 559x18, suitable tire sizes would generally range from 26x1.5 to 26x2.5 inches. The first number (26) indicates the approximate diameter of the tire in inches, while the second number (1.5 to 2.5) refers to the tire's width. It's important to check compatibility with your bike frame and any specific requirements for tire clearance. Always refer to the manufacturer's specifications for the best fit.