A "suspension corrected" rigid fork is designed to replace a suspension fork without compromising the steering or bottom bracket height. The reason this term is used is because normally you would design a rigid fork to be as short as possible from the axle to the crown (bottom of the lower headset bearing). However, when a bike is designed for a suspension fork, you need to use a rigid fork with longer fork blades to keep from making the steering too quick or the bottom bracket too low. The length of a suspension corrected rigid fork should be about the same as a sagged suspension fork. The sag is usually about 20-30% of total travel and is the result of the rider sitting on the bike.