I have a fat bike with SRAM GXP 100 mm bottom bracket. Except for the length of the plastic sleeve that connects two cups, it looks exactly like BSA 68/73 mm bottom brackets used on non-fat MTBs. I wonder if it is possible to use BSA 68/73 cups with this fat bike. The original longer plastic sleeve can be reused if necessary, because it barely gets any wear during exploitation.
This would greatly extend number of bottom bracket options compatible with my frame.