Originally Posted by nfmisso

Yes.



Nominally, the center of the cassette should be aligned with the center of the chain ring(s). When you removed the smaller ring, the center moved outwards a few millimeters. There is not a "standard" spacing for front chain rings; so you'll need to measure what you had. You could purchase a BB that is twice the distance shorter to keep things like they were - for example; if you had 7mm center to center spacing on the chain rings; you might want to move the single ring inwards by 3.5mm; which means you'll need a BB with a 7mm shorter axle than your current ring. This will also move your pedals 7mm closer together.

Now that may NOT be the best idea for you. Analyze which sprockets of the cassette you use the most, for example, if you rarely get to the smallest sprockets, and are mostly on the bigger sprockets, you may want to move your chain ring further in (shorter BB axle) - OR you may want to move your chain ring to the other side, and go with a fractionally longer BB and add a chain guard if you don't have one.