these will adapt that threadless fork to your old school threaded headtube (standard BMX sizing anyway, not mini’s/Sting/and oddities that use roadie sets).
TASTE THE RAINBOW! RED-BLUE-GOLD-BLACK-SILVER for your race bike. These are a no-name/non-logo Asian import, but that keeps the price friendly. Tested these on a couple bikes and though inexpensive, they seem to be decent quality. SEALED CARTRIDGE BEARINGS, compatible with ‘Campy Standard’ integral race forks (green available S/O, but I’m not stocking it at this time).
$30 shipped (domestic)
For you freestyle/flatland guys, the most popular choice has been the FSA The Pig DH Pro. GIGANTIC 3/16 lower bearings with a cromo cup and a trim upper alloy cup leaves plenty of room for that gyro.
SEALED CARTRIDGE BEARINGS. Black or Chrome/polished, NOT NOT NOT compatible with integral race forks. Your fork must take the normal slip-on race.
$60 shipped (domestic)
I can also cut your existing favorite headset for $20 (including return shipping) you have that favorite Chris King or whatever. I generally have all colors of the aluminum set in stock (except green of course) the FSA set not so much as my supplier is here in the states and usually just three days away so it doesn’t make sense to sit on large inventories.