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.
Rim size is the Diameter of the BEAD of the TIRE, which cannot be measured without removing the tire from the rim. All tires have a Size Series printed on them that contains the wheel / rim size. This series of numbers usually begins with a P (for Passenger) or LT (for Light Truck) Examples: P185/70/R15. LT225/80/R16.