It's best not to use tire sizes in inches, as there are often several different sizes in the same inch designation. Safest is the ETRTO size in millimeters, where 700C = ETRTO 622 mm.
If you insist, 700C will usually be a 28" - but there are at least two sizes starting with 28".
3328.4 inches
12 inches
A bicycle tire labeled as 700x45c is equivalent to approximately 27.5 inches in diameter.
To read inner tube sizes for bicycle tires, look for a series of numbers on the tube. The first number represents the diameter of the tire in inches, while the second number indicates the width of the tire in inches. Make sure to match these numbers with the size of your bicycle tire for a proper fit.
The specifications of a 14 x 1.95 bicycle tire refer to its size. The tire is 14 inches in diameter and 1.95 inches in width.
The recommended tire size for a bicycle with a wheel diameter of 29x2.25 inches is typically 29 inches in diameter and 2.25 inches in width.
The recommended tire size for a bicycle tube with the keyword "26x1.5 tube" is a tire that is 26 inches in diameter and 1.5 inches wide.
The recommended inner tube size for a bicycle tire with a 26-inch diameter is 26 inches.
The recommended size for an inner tube for a bicycle tire that is 26x1.5 is 26 inches in diameter and 1.5 inches in width.
My answer is 12
The recommended tire size for a bicycle with a 26-inch wheel diameter and 2.1-inch width is typically 26 x 2.1 inches.
The equivalent size of a 700c inner tube for a bicycle tire is typically 28 inches in diameter.