How is the core size of a replacement grip determined during the grip installation process?

The core size of a replacement grip is determined by locating the inside lip of the grip. This measurement is crucial because the core size is the internal diameter that fits over the golf club's shaft.

When installing a grip, the inside lip aligns with the upper end of the grip, allowing it to sit correctly on the shaft. Ensuring that the core size is appropriate prevents any slippage during play and enhances comfort for the golfer. A grip that fits well will provide better control and feel, which is essential for effective performance on the course.

Other options do not directly relate to determining the core size. Measuring the outside diameter of the grip pertains to the grip's size, not its core fit. Evaluating the flex of the original grip and assessing the grip's overall length are more about the performance characteristics and personal preference, rather than the core size determination itself.