When should tandem trailer tires be rejected?

Tandem trailer tires should be rejected if a gauge block can be inserted between the tire and caliper. This situation indicates that there is insufficient clearance or that the tire is improperly seated. Proper mounting and fitment are crucial for vehicle safety, especially for tandem axles, where load distribution and tire stability are vital.

If there is excessive space allowing the gauge block to fit, it can be a sign of improper tire installation or an issue with the axle alignment, which could lead to further complications, such as uneven wear or potential tire failure. Maintaining the correct tire fitment is essential for reliable handling and performance, especially when carrying heavy loads.

The other options, while they might indicate poor tire maintenance or condition, do not immediately necessitate a rejection based on safety regulations as clearly as the specified situation. Mismatched brands or different tread designs can lead to handling inconsistencies, and uneven wear is a sign of a need for further inspection or maintenance but does not inherently justify rejection unless they affect the tire's safety or performance severely.