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 sizes are defined as (diameter x width), so that a 17â diameter wheel might be 17x7â, 17x7.5â or 17x8â. Widths tend to scale up with the diameter, so that while you will almost never see a 17x5â or a 17x10â wheel, a 14x5â or 19x10â wheel are standard sizes.