700 on a bike tire means the approximate diameter of the tire in millimeters.
The 700 on the bike tire means that the bike tire's diameter is around 700 millimeters and is a French system.
The C on the bike tire means the tire's width, which is often between 28 to 35 millimeters.
700 C bike tires are made to fit 700c bike rims which also have a diameter of 622 millimeters.
The 700C is also now the world's major wheel size standard for road bikes.
The 700C size also equates to around 700รท25.4 = 27.5 inches.
The bicycle rim diameter of a 700c wheel is actually slightly smaller than that of a '27inch'.
700c bead diameter is 622mm whereas 27'' bead diameter is 630mm.