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.
Simply put, a tire size calculator is a tool for determining the size of the tires that are appropriate for your vehicle or vehicles. Ultimately, the easiest and most efficient tire size calculators are found online and they will allow you to select your vehicle by entering the year, make and model. At that point, a specific tire size will be listed. For example, it may list the size 195/60R16.