The difference in wheel diameter causes the footprint of the bigger wheel's tire to be more
The 700 originally referred to the outside diameter of the tire.
A bicycle wheel is a wheel, most commonly a wire wheel, designed for a bicycle. A pair is often called a wheelset, especially in the context of ready built "off the shelf" performance-oriented wheels. Bicycle wheels are typically designed to fit into the frame and fork via dropouts, and hold bicycle tires.
So when I saw all these different tire sizes, I assumed they all required a different wheel size, but in fact, there is essentially just one wheel diameter for my type of bike, which they refer to as 700C...
The approximate diameters of the rims for these sizes are
“Everyone should ride 700c wheels…” “Everyone knows that 650c wheels are more aerodynamic!”
Wheel diameter = (rim diameter) + (tire diameter * 2). Wheel circumference = Wheel diameter * PI.
The table below shows the difference between 650c and 700c wheels. Wheel size: Bead seat diameter, mm Overall diameter, mm Overall radius, mm Tyre circumference, mm.
What is the diameter of a 700c wheel including a 38mm ish tyre?
"700C and 29ers are like two inches different in diameter." he said.