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.
Tire widths for a wheel/rim size chart shows what tire widths fit displayed wheel/rim sizes - shows tire width range for a given rim width: minimum, ideal and maximum tire widths (e.g. for an 7 wheel/rim, following tire widths can be fitted: 195, 205, 215 or 225).