Obree started very fast, the second kilometer was more than 55 km/h. But he could not hold this pace slowing down more and more. But he was never in danger to fall below Boardman's mark. One can speculate if he would have made 53 km/h with disc wheels instead of trispokes. Research of the german TOUR magazine (issue 9/96 and issue 9/93) showed that one can gain about 1.0 km/h (at 52 km/h) by using two disc-wheels instead of two tri-spokes (look at my page "motion of a cyclist", where Spengle-Trispokes were tested). So even with a conservative estimate 53 km/h should have been easily possible.

There is a video on Youtube with Miguel Indurain's attempt from later that year. In this video the lap times are not shown, just the times for each kilometer. So one can create a graph similar to that above:

Video of the hour record attempts 1994 (Obree, Indurain, Rominger) on Youtube

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