The difference between 2 and 4 link spacing on tire chains refers to the arrangement and density of the individual chain links on the tire chain itself.
In a 2-link spacing chain, each cross-link spans two side links before connecting to the next cross-link. This results in a closer arrangement of the chain links, providing more traction on slippery surfaces. 2-link spacing chains are generally preferred for more severe or icy conditions, as they offer increased grip and stability. (cross chain every other side chain link)
On the other hand, in a 4-link spacing chain, each cross-link spans four side links before connecting to the next cross-link. This creates a wider spacing between the chain links, which can be suitable for less severe winter conditions or situations where a smoother ride is desired. 4-link spacing chains are often more forgiving on surfaces like pavement, reducing the chance of excessive noise and vibration. ( cross chain every 4th side chain link)
The choice between 2-link and 4-link spacing depends on the specific road and weather conditions you anticipate encountering, as well as your preferences for traction and ride comfort.