Pennsylvania CDL Practice Exam 2025 – Complete Study Resource

The minimum tread depth required for commercial vehicle tires is indeed 4/32 of an inch for steer tires, and 2/32 of an inch for all other tires, which is why this answer is the correct choice. The deeper tread on steer tires is critical because these tires are responsible for providing traction and steering capabilities. Insufficient tread depth on steer tires can lead to loss of control, especially in wet or slippery conditions.

On the other hand, while other tires (like drive and trailer tires) have a lower minimum requirement, having too little tread depth can also impact their performance in terms of traction and safety. Therefore, maintaining proper tread depth according to these regulations ensures optimal vehicle performance and safety on the road.