“Taco” refers to a poorly bent or deformed bicycle wheel. It occurs due to a crash or a forceful impact. The form resembles a taco shell due to which it got its name.
When a wheel becomes bent, it cannot be reused because its surface isn’t straight or round. This influences the safety and performance of the bike. It typically requires replacing the rim or the entire wheel to repair a bent wheel. Such damage tends to occur in a high-speed crash, when you ride into a curb, or when you ride into a pothole the wrong direction.