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.
A quick and easy way to find out the size of your wheel is to check the radius (R) of your tyre e.g. 205/45R15 tyre would indicate you have R15 = 15 inch tyre on your car. As a result of your tyre size, the diameter of your alloy wheel will be 15 also. Alloy Wheel Width.