Ummm. not to piss in your cornflakes, but most of the SS machines need the premium stuff due to their higher compression ratio... says so in the manual too... otherwise they will suffer from detonation/pre-ignition/pinging... whatever term you prefer.Ugh. Here are some answers (I'm guessing at your question):
1. Read your owners manual...or look at the sticker under the seat/tail/wherever it is on whatever you're riding.
2. Use 87, you'll be fine. Use 93, you'll be fine, but you won't get any extra power/speed/whatever all things being equal.
3. Use search. Yep 93,89,87 returns nothing. "Octane" on the other hand returns 200 results (the forum limit for results).