Out of my 4 bikes only one, my Mongoose Amplifier 2, still has a triple chainring. Single or dual appealed to me because I never use extreme high or lows. My On-One Summer Season is 1x9 using Funn Hooka crank and a single 36 chainring. My Mongoose Deuce Pro is 2x9 using Truvativ Holzfeller 36-24...