The main purpose of having a power rack is safety. Thus it is important to choose a rack with high weight rating. These values usually represent the static weight load, so a safe gauge will be to have the rating double of what you can lift.
Narrow hole spacing is required for setting the safety bar at the correct height. For example when doing bench press, if the safety bar is too high, it will reduce the range of motion when benching, and if it is too low, it is the same as not having it. Recommended hole spacing is the most 2 inch apart, and of course smaller will be better.
The rack must be wide enough to allow enough room for workout inside. However it cannot be too wide that when re-racking, you need to be precise to make sure the inner bar fit in the j-hooks. Another problem with a rack too wide is that the plates will hit the upright while you are moving the bar towards / away from t... See More