See chart below, actual mile-by-mile speed, maximum speed and cumulative average speed. It's not steep hills that get you; it's the constant choppy turbulence of the course that wears you down.
This is how to ride a 5:54:37 bike split at Ironman Wisconsin. For video of this ride and more, see Ironman Wisconsin: 5:54 Bike Split, Live.
For more, see our Complete Ironman Wisconsin Race Coverage.