In a pre-trip inspection, what condition must a tire rim be in?

The condition of a tire rim during a pre-trip inspection is critical for vehicle safety and performance. A rim must be free of cracks or rust to ensure structural integrity. Cracks can lead to rim failure, particularly under the stress of driving, which can have dangerous consequences. Rust can indicate corrosion that may weaken the rim's structure, potentially leading to tire blowouts or loss of control while driving.

Additionally, the rim must be tight and secure. This ensures that the tire is properly mounted and might help to avoid issues like tire separation while on the road. A securely fastened rim also helps maintain the alignment and handling of the vehicle, contributing to overall safety.

In contrast, rims that are cracked, dented, or displaying excessive rust or grease are unfit for safe operation. Likewise, loose bolt holes indicate a potential failure point that could compromise the attachment of the wheel to the vehicle. Therefore, maintaining rims that are in excellent condition is essential for safe driving.