Cyclist Sam Wenley told Fairfax he had been cycling through the herd when the steer started running alongside him on the road, seemingly agitated. It then turned on him, knocking him off his bike.
Wenley said he must have been in a daze after hitting the road.
"The plumber was the unsung hero, and when I spoke to him later he was really kind and understanding. If he hadn't been there it could have been a lot worse for us."
After hitting Wenley, the steer took off down the road towards two other cyclists, who were stationary.
Gully described the steer picking up speed and hitting another female cyclist head on.
"She just froze then boom! She flew up in the air," he said.
She was left conscious, but was not moving and suffered serious leg injuries.
The Hastings District Council and Hawke's Bay Regional Council said farmers were expected to adhere to NZ Transport Agency rules - which included providing due care to other road users when moving stock.