What is the maximum allowed difference in diameter between dual rear tires on a fire apparatus?

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Multiple Choice

What is the maximum allowed difference in diameter between dual rear tires on a fire apparatus?

Explanation:
Difference in diameter between dual rear tires must be within 3/8 inch. This small tolerance keeps both tires on the same axle turning at nearly the same rate, ensuring even load sharing and stable handling on a fire apparatus. When one tire is noticeably larger, load is uneven, steering and braking can become unpredictable, and heat can build up, raising the risk of tire failure. The 3/8 inch limit (0.375 in) prevents these issues. If measurement shows a greater gap, replace the tire(s) to bring the diameters into spec and maintain proper compatibility.

Difference in diameter between dual rear tires must be within 3/8 inch. This small tolerance keeps both tires on the same axle turning at nearly the same rate, ensuring even load sharing and stable handling on a fire apparatus. When one tire is noticeably larger, load is uneven, steering and braking can become unpredictable, and heat can build up, raising the risk of tire failure. The 3/8 inch limit (0.375 in) prevents these issues. If measurement shows a greater gap, replace the tire(s) to bring the diameters into spec and maintain proper compatibility.

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