The SAE Class "W" refers to a type of tire chain classification for passenger vehicles. It is one of the classifications defined by the Society of Automotive Engineers (SAE) to indicate the performance and characteristics of tire chains.

SAE Class "W" chains are designed for use on vehicles with limited clearance between the tire and other components, such as suspension parts or fender wells. These chains are typically low-profile and offer a more compact design compared to other classes.

The SAE Class "W" chains are intended for passenger cars, sedans, and similar vehicles where space constraints may restrict the use of larger or more bulky tire chains. They provide traction and improved grip on snow, ice, or slippery road surfaces while minimizing the risk of interference with vehicle components.

When selecting tire chains, it's important to refer to the vehicle manufacturer's recommendations and the specific SAE Class rating to ensure that the chains are suitable for your vehicle's tire size and clearance requirements.