The configuration of lug nuts on a Toyota 4Runner’s wheel hub, a crucial element for wheel compatibility and vehicle safety, is a specific circular arrangement. This arrangement, defined by the number of studs and the diameter of the circle they form, dictates which wheels can be safely and securely mounted to the vehicle. For example, a “6×139.7” configuration signifies six lug nuts arranged on a circle with a 139.7-millimeter diameter.
Understanding this configuration is paramount for ensuring correct wheel fitment. Utilizing wheels with an incorrect configuration can compromise the vehicle’s structural integrity, leading to potential wheel detachment and posing a significant safety hazard. Furthermore, knowing this specification allows for informed decisions regarding wheel upgrades, replacements, and the use of aftermarket rims. This specification has remained consistent across certain generations of the 4Runner, providing a degree of interchangeability within those production years.