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.
How do I determine my wheel / rim size? DO NOT MEASURE RIM OR HUBCAP SIZE - A tape measure will give you the WRONG size! It will measure a little over an inch larger than the actual wheel size. 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)