It is a hub.
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The center of a wheel or circle is called a hub.
polyp
It's called a hub.
28 - 21 = 7Which is a fairly silly answer as there are no 21" bike wheels. The spoke thing is quite misleading, as there are several things that aren't mentioned here that affect spoke length.If stood side by side the 28" wheel will reach 7" higher than the 21" wheel.7 inches difference . As 28-21=7The 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?
None. A wheel, be definition, is circular and therefore has no vertices!