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SAE
Society of Automotive Engineers (SAE) class of traction aid must be installed, based on the wheel clearance of the vehicle.
| SAE traction device class | Minimum tread-face clearance
| Minimum side-wall clearance |
| Class S |
1.46 in |
.59 in |
| Class U |
1.97 in |
.91 in |
| Class W |
2.50 in |
1.50 in |
The SAE Class "S" well clearance is a common requirement on newer cars, especially if after-market wider, low-profile, or larger tires and/or wheels are fitted.
The classes are defined as follows:
- SAE Class S - Regular (non-reinforced) passenger tire traction devices for vehicles with restricted wheel well clearance.
- SAE Class U - Regular (non-reinforced) and lug-reinforced passenger tire traction devices for vehicles with regular (non-restricted) wheel well clearances.
- SAE Class W - Passenger tire traction devices that use light truck components, as well as some light truck traction devices.
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