Swapped deore cranks onto new bike, spindle too short. It’s quite an old crankset but in any case does a new BB or even a new crankset need purchased?

If the new frame is 73mm wide instead of 68mm you only need to add one spacer to the driveside cup (instead of the 2 drive, 1 non-drive you had before).

Is it a DH bike with a 83mm BB shell?

Let’s not forget fatbikes…

It’s a 2017 Marin Nail Trail 9 and I can’t find the spec anywhere that tells me the current BB spec so I am a bit confused

Tinypic isn’t working…. I’ll probably just take it down the LBS. Things with spacers confuse me.

Too late for an edit, here….

^pic not working.

Measure the width of the BB shell on each bike (don’t include any spacers in the measurement).

A ruler will be plenty accurate: