How do you pump up the air preload on bomber forks?

To pump up the air preload on bomber forks, first, ensure that the bike is on a stable surface and the front wheel is off the ground. Locate the air chamber valve, typically found on the top of one of the fork legs. Use a high-pressure pump with a compatible fitting to add air, checking the recommended pressure range specified by the manufacturer. After adding air, compress the fork a few times to settle the pressure, then check the sag to ensure it meets your riding preferences.