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What's the minimum tread depth for a steer tire vs a drive tire in the 310T curriculum?

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Based on the preventative maintenance standards for heavy duty trucks, here are the minimum tread requirements:

Steer Tires: Require a minimum of 4/32" (3.2 mm) of tread depth in every major groove. They are critical for steering control and blowouts on steer axles are highly dangerous.

Drive and Trailer Tires: Require a minimum of 2/32" (1.6 mm) of tread depth.

Source Material
Preventative Maintenance Module (Topic 12) - Section 4: Tire Inspection
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