Re: S/C pulley?
I would hazard the opinion that 67 mm is too small and would one day fracture due to the stresses.
Pulley diameter (67) minus twice the groove depth (.140) minus the bearing outside diameter (55), all divided by two equals the wall thickness remaining.
Thus;
[Ø2.638 –(2 x .140) – Ø2.165] ÷ 2 = .096 wall thickness.
The weak point will be the sharpish corners inside the pulley bore.
I would feel safer with a pulley modified to 69mm which would increase the wall thickness by an extra .040 to .136.