I throw a lot of cranks, so I went with the 6.8:1 ratio. Ended up doing the math between that and the 7.5:1. 50 feet is 600 inches, 6.8 takes 28 inches of line per rotation, and 7.5 takes 31. So, 600/28 gives you about 21.5 rotations vs 19.4 for the 7.5. All in all, at 50 feet there is a 2 crank difference and I get the little extra torque I wanted.