I'm old school. I like half step gearing, what I call it anyway. 49-52 chainrings and 14-24 6speed in the rear. This way you use the frt. and rear sprockets in an alternating fashion to move through your gears. Low is around 50 in. and top is 100+ in. But can anybody really turn anything bigger than an 88 for very long anyway. Cant figure why people have 12 tooth sprockets!