D. 
Taiwan sealed
Taiwan wheels are on Taiwan mopeds. They do things more like motorcycles and less like bicycles. Asian wheels always have sealed bearings, with axles that slide out, like motorcycles. Asian spokes have inner and outer types, like motorcycles. Asian hubs are always cast aluminum, never stamped steel, like motorcycles. Asian hubs are always single chain rears, since they do not “believe” in having both a motor and pedals at the same time.
E. 
Korea sealed
Trac Olympic Rear Wheel similar to ’78 Honda CT90
fig qty Trac# 00 Daelim# 000 description
1-0 1 25051 42600-005-890 rear wheel complete
1-1 1 25052 42601-005-890 rear hub complete
1-1 1 00000 00000-000-000 L wheel bearing 6301 ∅12 ∅37 x 12
1-1 1 00000 00000-000-000 R wheel bearing 6301Z ∅12 ∅37 x 12
2-0 1 25059 42610-005-890 cush-drive flange ∅40
2-0 1 00000 00000-000-000 sprocket bearing ? ∅27? ∅40? x ??
4-0 1 25065 42301-HD2-890 rear axle ∅12
8-0 1 25061 42304-005-890 collar ??
9-0 1 25060 90753-029-003 oil seal ∅27 ∅40 x 6
11 1 25058 42303-005-890 axle sleeve ∅12 ∅17
13 1 25056 42653-001-004 o-ring ∅40.5 x 3.0