What is the required steering angle for non-driving front axles?

• A. 25 degrees
• B. 28 degrees
• C. 32 degrees
• D. 30 degrees

Answer: (D)

Non-driving front axles act as the steering axle, so they must be able to steer enough to let the vehicle make turns while the rear wheels follow. About 30 degrees is the typical limit used because it provides a practical turning radius for tight maneuvers without causing tire scrubbing or clearance issues with the chassis and bodywork. It’s a balance between enough steer to position the apparatus accurately—important for things like aerial deployment—and keeping the tires and steering linkages from binding or wearing excessively. If the angle were larger, tires would scrub and components could strain; if smaller, maneuverability in tight spaces would suffer. Therefore, the required steering angle for the non-driving front axle is 30 degrees.