In the sport of weightlifting - i.e., the snatch and clean-and-jerk - due to the wider grip widths used in the clean, the jerk, and specifically the snatch, it is useful to have a wider set of rings for reference, and thus, the weightlifting rings are set a bit wider than the power rings.
The Problem
A potential problem arises when a lifter switches from one barbell to a different barbell. Suppose, for example, that Jack is accustomed to training on a bar that only has one set of rings, and then he travels somewhere and ends up using a dual-ringed bar. Suddenly, Jack’s not sure which set he should be using for his reference point for his grip.