Police are investigating whether a space-saver wheel played a part in the crash which killed a Rotorua mother.
Dianne Rickerby, 33, died on Sunday in a crash between Te Puke and Papamoa about 4.15pm. Her son remains in a critical condition in Waikato Hospital after being cut free from their wrecked Honda Integra by firefighters.
The rear near-side wheel was a space-saver, a spare wheel intended for emergency use only and not designed to be used over long distances. The New Zealand Transport Agency recommends using a space-saver to get directly home or to a place where the flat tyre can be repaired or replaced. It also recommends that because the vehicle is likely to handle differently with a space-saver wheel drivers don't drive faster than 80km/h.
The head of road policing in the Western Bay of Plenty, Senior Sergeant Ian Campion, said crash investigators were looking into all factors surrounding the crash.
"It is one of the many things we're looking at," he said.