I don't know how you all do it. I have a hybrid 26-36-48 on the front and 11-34 9-speed. I use the 36/34 combo all the time. I rarely use the 48t chain ring. If I'm heading downhill, I don't care to be doing 40 mph at all. 35 is the fastest I'm comfortable with and even that is pushing it. I can get 28 mph, maybe more, in the 36/11 combo, but by that speed, I'm just happy coasting. By the time I'm getting to that speed, I'm just about at the bottom and heading back uphill anyways so there's not much need for anything more.