We've created a tutorial on where and how to measure tire tread depth on a semi-truck. This helps measure the life of the tire so you can perform preventative maintenance. The Department of Transportation also requires a certain tread depth for your tires when in use because when tires hit a certain depth, or become bald, they are considered more dangerous on the road. Here are those requirements:

Steer Tires: New steer tires should come in between 18/32"-22/32". The DOT's legal limit for steer tires are 4/32". Anything below this is considered out of service.

Drive Tires: New drive tires should come in between 22/32"-32/32". The DOT's legal limit for drive tires are 2/32". Anything below this is considered out of service.

Trailer Tires: New trailer tires should come in between 12/32"-14/32". The DOT's legal limit for trailer tires are 2/32". Anything below this is considered out of service.

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