Good news is, I've got a pocket full of cash to spend on my bike. Dax has sprockets, and I'm gearing down for the hills. Question is, which sprocket? I think I may order two sizes. It's almost 200 miles to Phoenix, down the Mogollon Rim, which is basically a mountain range. They've got 54, 56, 60, and 72. I've got a 44t on Tanglebones currently. I'm running about 30, if I rack it out, 25ish cruising. What speeds y'all reckon those will give me? Or, even better, can someone give me a little math lesson?