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 Nomenclature. CLICK if you want tire size and more, use the Advanced Calculator. To use the Tire Calculator, enter the top part of the data into the form. For Example a tire size of P245-45R-17 would make you Enter 245 for the Width, 45 for the Aspect Ratio and 17 is the Rim Diameter.