Mr motorcycle club, SG75 is open ball and requires maintenance. I have that as well as a the Hatta R9400, and while they are awesome track bb's, they're not ideal for street bikes.
The best sealed options for the SG75 cranks are the White Industries 108mm ISO bb, and the Phil 108mm ISO.
I'd get either of these over a SG75 open ball any day.
Of them all I like the WI best with it's shelved DS cup and lockring design, and it's a hundred bucks and uses a Shimano bb tool.