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.
Tire Width is the width of the tire measured in millimeters from sidewall to sidewall. The first three-digit number in the tire size refers to the tire width. For instance, in a size P215/65 R15 tire, the width is 215 millimeters.Aspect Ratio is the ratio of the height of the tire's cross-section to its width. The two-digit number after the slash mark in a tire size is the aspect ratio.For example, in a size P215/65 R15 tire, the 65 means that the height is equal to 65% of the tire's width.The bigger the aspect ratio, the bigger the tire's sidewall will be. Construction. The letter R in a tire size stands for Radial, which means the layers run radially across the tire.Wheel Diameter is the size of the wheel measured from one end to the other.he bigger the aspect ratio, the bigger the tire's sidewall will be. Construction. The letter R in a tire size stands for Radial, which means the layers run radially across the tire. Wheel Diameter is the size of the wheel measured from one end to the other.