I'm running 48:18 on my rig and it feels great. The only times I spin out are on steep downhills, and the 72GI is comfortable to climb in. The only downside is there are only 3 skid patches. I'm looking to gear up or down, 17T or 19T, to increase the number of skid patches. I leaning towards 19T to make it easier on my knees, but afraid of spinning out.