The diameter of the largest discs should not be any more than how many cm?

In powerlifting competitions governed by the International Powerlifting Federation (IPF), the dimensions of the equipment used, including the discs, are standardized to ensure consistency and fairness across events. The maximum diameter of the largest discs is set at 45 cm. This specification is crucial because it helps maintain uniformity in lifting conditions. All lifters must use the same size plates, which can significantly impact their performance during a lift due to differences in leverage, balance, and bar height.

Using discs of a larger diameter would create an unfair advantage or disadvantage among competitors, as they would alter the bar's position relative to the lifter's body. Therefore, by restricting the diameter to a maximum of 45 cm, the IPF ensures a standardized setup for all competitors, promoting fairness and safety in the sport. This standard aligns with international regulations and helps maintain the integrity of powerlifting competitions around the world.