Please tell me your question clearly and to answer your question as it is I am not knowing in what context this has come.
Roller offset - does it mean difference in setting gauge.If so to answer your question it would be easy.
Let us take the path of fibers passing through 3 pairs of rollers in spinning.
Front Bottom Roller dia 7/8 " - Middle Bottom Roller dia1" - Back Bottom Roller dia 1-1/8th inches.
Fiber length Mean as per Uster Test = 3/4".
The distance between the rollers must be more than 3/4" offset so that fibers do not break.
Top Rollers are set to be in perfect center of the dia line of the pair.
This is old technology update yourself with new technology.