A All-City Cosmic Stallion frame uses a BSA / English threaded bottom bracket shell (1.37" x 24 TPI). The dimensions, which cranks fit, and the exact bottom bracket to buy.
Updated 05 September 2026.
What bottom bracket does a All-City Cosmic Stallion use?
The bottom bracket shell standard on a All-City Cosmic Stallion, and how to pick the right BB.
| Frame | All-City Cosmic Stallion |
|---|---|
| Shell standard | BSA / English threaded (1.37" x 24 TPI) |
| Shell inside diameter | 1.37 in (about 34.8 mm) threaded bore |
| Shell width | 68 mm (road), 73 mm (MTB), 83 mm and 100 mm (fat / DH) |
SPINDLE see table
The All-City Cosmic Stallion uses a BSA / English threaded bottom bracket shell (1.37" x 24 TPI), a 1.37 in (about 34.8 mm) threaded bore, 68 mm (road), 73 mm (MTB), 83 mm and 100 mm (fat / DH) wide.
It is a threaded shell (1.37 in x 24 TPI, drive-side cup left-hand (reverse) thread, non-drive right-hand), so the bottom bracket screws in rather than presses. Confirm the shell width before buying, because the same thread is cut in more than one width.
SOURCES: BikeRadar, The complete guide to bottom bracket standards · Park Tool, Bottom Bracket Standards and Terminology · Wheels Manufacturing, BB Overall Width Reference Chart
Questions and answers
What bottom bracket does a All-City Cosmic Stallion use?
A All-City Cosmic Stallion frame uses a BSA / English threaded bottom bracket shell (1.37" x 24 TPI).