Im building a [standert kreissage rs](https://standert.de/products/kreissage-rs-beige-road-bike-frame) that came with a t47 threaded bottom bracket for SRAM dub cranks. (I’ll be installing SRAM Force road cranks). Frame shell is 68mm.
I believe the provided bb is from [first components](https://www.firstcomponents.com/bottom-brackets/sram-dub-bb/r4729a/) (~69-73mm). It comes with 2×2.5mm spacers and a 4.5 mm spacer.
Since Sram force 1 cranks are compatible with SRAM dub t47 68mm bb, I don’t think I need any internal spacers but will need a 3mm spacer between the bb and chainring.
Can someone confirm/correct my understanding? Also, when would the 4.5 mm spacer even be used?
by Candid_Ad_4144