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?
Area of bicycle wheel: pi*13 squared = 169*pi or about 531 square inches
I think you looking for a bicycle called the Penny-farthing, an early design of bicycle that had a very large front wheel.It is called a penny-farthing. Called that because the difference between the big wheel and the small wheel was similar to the difference between the old British pre-decimal penny and the farthing.
The gears on the rear wheel are called a cassette
bicycle with a basket
The center of a wheel or circle is called a hub.
Tyre
The center of a wheel is generally called a hub.
The wheel rim!
spoke
ferris wheel, a bicycle, a screw and a doorknob ferris wheel, a bicycle, a screw and a doorknob
If it has only one wheel it's a Unicycle .
A bicycle is both.
The wheel, and many other things a bicycle is a compound machine