Hi Mossie, my 2015 bike was a 9 speed to start with, but the principal I used might work for you. I bought a larger front chain ring to up gear the bike, in my case a 42 tooth front chain ring worked best and I combined this with a Shimano Alivio HG400 MTB 12-36t:12-14-16-18-21-24-28-32-36 9...