12mph

How Fast Do Triathlon Bikes Go? The average bike time across Ironman races is 6h18 min which translates to a speed of 17.8 mph or 28.6 km/h. The women cover 112 mi in 6h44 min (or 16.6 mph or 26.7 km/h) and the men in 6h12 min (or 18.1 mph or 29 km/h). How fast