29"
Cues used to be 57"....then it became 58"......and of course special order cues with longer butts and shafts......now extenders......and of course, specialized cue bridges.......so why a 30" shaft?
First and foremost is if it's a custom cue, you hurt the value when you go to resell it or trade the cue. 58" pool cues are the norm and just sell faster and easier too.
Secondly, I also think, and the shaft taper really matters a lot, a 30" shaft will tend to play a little less firm (more flex) than another identical shaft made in 29".
Anyway, that's how I see it and a expert cue dealer, probably the biggest in the USA, confirmed this for me last week......longer shafts make the cue harder to sell
when it's a fancy, expensive custom cue so I am extending market manifestation to equally apply to any & all cues.
Matt B.