Originally Posted by
cpach
If you want handling to remain the same, measure the axle to crown distance (from the center of the dropout to the bottom of the lower headset cup) and shorten that value by about 20% (to account for sag) to find the correct A2C for your new fork.
Wrong. To account for sag, you need to subtract ~20% of suspension fork
travel from the A2C figure, not 20% of A2C.
Or you could measure the sag directly (if the fork still works).