I'm planning on getting a dual ring chain guide, but my frame lack ISCG tabs.

How do I determine what type of bottom bracket I need?

I've seen some (raceface evolve DH in particular) that are described as "offset" for chain guide use. Should I go for one of those or simply get a bb that is slightly longer?

For reference, I ride a Yeti ASX, which specifies a 113 mm bb with a 73mm shell.

Any info is greatly appreciated!

Adam