The arrangement of the lug studs or holes on a wheel hub, described by the number of studs/holes and the diameter of the circle they form, is critical for proper wheel mounting. A mis-matched measurement results in unsafe operation and potential damage. For example, a specification of 4×115 indicates four studs/holes positioned on a circle with a 115mm diameter.
Correct dimensional specification ensures wheel compatibility and safe vehicle operation. Proper fitment is essential for even load distribution, preventing stress on the hub and wheel. Historically, manufacturers have used diverse configurations, necessitating careful attention to compatibility when replacing or upgrading wheels. Using the correct measurement eliminates vibration, premature wear, and potential wheel detachment.