I just measured my Schwalbe 2.3 Super Moto (same tire-more or less-as your Big Apple).It is just 2.3" wide no surprise. Most forks will accomodate a 2.3" wide tire, especially one with no knobs. My Manitou Black Elite forks have about 2.6-2.7" of room.
What fork are you using that won't take a 2.3" tire? Is the fork brace being rubbed by the tire? If so take a grinder to it.