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.
Wheel Width & Diameter: The alloy wheel size is shown as follows: Wheel diameter x Wheel width - e.g: 15 x 6.5J. The width is the section between the tyre mounting flanges on the wheel / The diameter is the overal diameter of the wheel.