65 mph. It was during RAGBRAI in 1998. I was in a paceline going down Pilot Mound Hill. For those that know what RAGBRAI is and know about the Pilot Mound Hill you know this is very possible on that hill. Especially since that part of the highway was redone prior to RAGBRAI that year. I hit this speed on my old road bike.

So far on my Vision R40 recumbent I have only managed to go as fast as 45 mph.