This is probably a newbie question but I've not had this problem before, my BB has died. It's not a sealed unit, I've had a look and the cages that held the ball bearings were wrecked.
I want to replace it with a sealed BB but I'm not sure what size to go for. The non drive side cup is about 35mm diameter if that helps. Looks to be the older adjustable 3 piece style.
I want replace it a sealed unit, does anyone know if this is possible? I bit of research shows I can replace the bearings but I'd rather just do the whole thing. It's a square taper.