I had riden the same roadbike for 20 years which was a 12 speed. Thus when in the small front chainring I knew I was in gears 1-6 and with the large in gears 7-12. I now have a new bike, 24 speed, with three front chainrings. Seems confusing to try and think of gears 1-8, 9-16 and 17-24. Is this the correct way to think of the gears or are they referenced ie...3 / 8 for gear 24?