I was originally going to post this as a reply in the "Bowling This Month Magazine" post by Melvin45, but decided to start a new post instead.

This is an interesting topic because it helps explain the discrepancies we see in different peoples' opinions of the proper lane condition for certain balls.  I regularly hear someone refer to a ball that is generally considered to be a ball for light oil conditions--and IS a ball meant for light oil conditions--as being very effective for them on medium or medium-heavy lane conditions.  A couple of balls that come to mind are the Sonic Boom and Sonic X Solid.  I have both of these balls, and I bought them for their recommended conditions--light oil.  I use the Sonic Boom very effectively on light oil, and the Sonic X Solid on very light oil--what is generally simply referred to as a dry lane.  Yet, I have seen posts where people deny that these balls are for light oil and claim to use them on medium to medium-heavy.  I am going to venture a guess that these are people who are rev-dominant.

On the other side of the coin, people who are speed dominant may sometimes find that balls that are touted as being for heavy oil are actually more effective for them on medium conditions.  This happens to me all the time.  Ball companies are more likely to exaggerate the oil handling capacity of their balls than they are to tout them for medium or dry.  I have used many balls that are listed as being for heavy oil very effectively on medium conditions.  When I want a heavy oil ball, I have to look for something that is REALLY a monster.

Before someone jumps in and points it out to me, I realize that axis tilt and axis rotation play a major role in what type of ball does what on what condition, but your speed/revs ratio is also a major player in the equation.
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Listening to the monotonous staccato of rain on my desk top