If you end up having to thread a BB shell with 1.370X24 BSA (standard euro) you will need a shell inside diameter of 1.325"-1.335". to begin with. If yours is smaller, you can use a 1-1/8" (OS) deep head tube reaming cutter to achieve a usable diameter.


I have a Teledyne in my shop to fix some cracks. It's standard BSA threading.