The intervertebral foramen (also called neural foramina, and often abbreviated as IV foramina or IVF), is a foramen between two spinal vertebrae. Cervical, thoracic, and lumbar vertebrae all have intervertebral foramina. The foramina, or openings, are present between every pair of vertebrae in these areas. A number of structures pass through the foramen. These are the root of each spinal nerve, dorsal root ganglion, the spinal artery of the segmental artery, communicating veins between the internal and external plexuses, recurrent meningeal (sinu-vertebral) nerves, and transforaminal ligaments.
The diameter of the rim has to match the diameter of the tire. In general, the diameter can be anywhere from 14 to 18 inches. However, this measurement can change if the wheel has an aftermarket rim. Larger diameter rims provide improved handling, but they also cost more (much like wider tires).
This tire width is 215 mm. Rim diameter is the width in inches or cm of the wheel from one end to the other. The diameter of this wheel is 16 in. Always replace a tire on a rim with another tire of exactly the same rim diameter designation and suffix letters. Speed rating tells you the maximum service speed for a tire.