With the Drum braked trike wheels I had, going to be used on the Trice, I need some wheels for the other trike I've been building.
They reckon you need at-least-12mm High tensile axles for a trike.
Most 20" wheels are 36 spoke
Most decent front disc hubs are 32 hole
The cheaper hubs that are 36 hole are usually cup & cone bearings
Some time ago, I found some decent DMR Revolver hubs with sealed bearings and 36 hole...
...cheap
Problem is they have 10mm axles,
Standard bearings aren't often available with the OD to fit the hub and an ID of 12mm.
Luckily, this week, I score a job lot of 30, new, non-standard bearings that fit - for a fiver!
The old seals and bearings can be drifted out and the new bearings pressed in.
Two of the four end covers are drilled out, on the lathe, to 12mm and will fit on the inboard side as a spacer. The rubber seals are reinstalled on each side too.