A fibroblast is a type of cell that synthesizes the extracellular matrix and collagen,[1] the structural framework (stroma) for animal tissues, and plays a critical role in wound healing. Fibroblasts are the most common cells of connective tissue in animals.
For example, a 700 x 20 C road tire would be a 20-622; a 700 x 38 hybrid tire would be a 38-622. The width difference between these sizes would make them less-than ideal replacements for one another, but any rim that could fit one of them would work after a fashion with the other.
The only notable thing about tire sizes is that the numbers do not provide a means of determining the outside diameter of the tire. For example, a 9.00-20 tire is not 2 x (9.00) + 20 = 38 inches in diameter. (40.1 to 40.7 inches are the actual limits.) The first number (9.00) is the nominal section width, not height, so unless the tire cross-section was square or circular the height will be different.