Home › CDL Practice Tests › General Knowledge Questions › Question 232
What wheel defect is indicated by cracks radiating between the hand holes or around the lug holes of a rim?
- A.Radiating marks are normal casting lines
- B.The cracks are paint defects only
- C.Cracks mean the rim was recently cleaned
- D.The rim is structurally failing and must be taken out of service before the wheel can separate
Correct answer
D. The rim is structurally failing and must be taken out of service before the wheel can separate
Why
Rims carry enormous cyclic loads, and cracks in the disc spread with every revolution until the center can tear out. Like a bent or cracked rim found anywhere else on the wheel, this is a park-it defect, not a finish-the-trip one.
Manual topic: Tires - Wheels and Rims · From the General Knowledge practice bank (GK-232).