I raised the bottom bracket about three inches. There is about a 13" seat/BB differential now. I did this to reduce the activation of the quadriceps during the push portion of the pedal stroke. This shifts the effort from my predominately fast-twitch quads to my slow-twitch glutes and hamstrings. It's also easier on the knees. Given the upright seat I'm guessing it'll be more aero too.
I had to move the idler bolt forward and down a bit to clear the chain under the seat.
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