Origin8 (Formerly Bulletproof) BMX cranks can be used as a single or double chainring setup.
These use the highly versatile 110 mm bolt circle, and fit standard tapered-square bottom bracket axles.
Q with 103mm BB is 150mm.
Chainline w/107 mm bottom bracket:
43.4 mm as double (middle of spider)
47.1 mm outer ring
39.7 mm inner ring
158 mm tread ("Q factor")
Arms only, no bolts nor chainrings included.