The diameter of one bicycle wheel is 28 inches and its spokes run from the hub or center to the edge of the rim The diameter of another bicycle wheel 21 inches What is the difference in inches bet?

The diameter of one bicycle wheel is 28 inches and its spokes run from the hub (or center) to the edge of the rim. The diameter of another bicycle wheel 21 inches. What is the difference in inches between the length of the spokes of the two wheels?

pi * diameter = circumference, if that's what you're looking for. But be aware that the numbers and sizes used to describe bicycle tires are often very inaccurate. So all you have to do is just subtract 28 from 21 and divide your answer by two!! 28-21=7 7/2=3.5