Is there a reason you just couldn't slam a cog on a freehub body & use a bunch of spacers to make up the difference? 120mm freehub.

This has sketchy written all over it.

FWIW: Smaller bearing balls are weaker & will crush into the bearing race much sooner on their way to to becoming tiny oval shaped rocks of crunch. There is a reason rear hubs have 4 (count 'em 1, 2, 3, 4) 6902 bearings & front hubs have only 2. It's because the load on the rear is greater. Both in terms of the mass supported, but also the additional loads involved in propelling the bicycle.

Anecdote time: IME Formula hubs are garbage. My wifes mountain bike got about 6 road rides on it before it got notched & crunchy. My road bike front got about 3000 miles before it seized near solid. The front wheel would spindown in about 5 seconds. Cheap, worthless. Formula is a brand to be avoided.

Track rear hubs are not road front hubs.

Subscribed.


Edit: JBI bike has it. Not in stock. Can be drop shipped. Your bikeshop can probably order it as JBI is one of the largest bike parts distributors in North America SunXCD 1 thru 6 speed free hub 120mm OLN 32 hole.