The crash resulted in the death of Combs and a "jet fuel fire on the desert."
39-year-old Combs, from Long Beach, California, was pronounced dead at the scene.
In the latest press release obtained by USA Today, officials revealed the cause of the crash.
"Based on the evidence collected and examined at the scene of the crash and the evidence recovered by the North American Race Team it appears that there was a mechanical failure of the front wheel, most likely caused from striking an object on the desert," the release read. "The front wheel failure led to the front wheel assembly collapsing. The front wheel failure occurred at speeds approaching 550 miles per hour."
Combs' cause of death was said to be "blunt force trauma to the head" that occurred before the fire ignited.
After two completed runs, Combs achieved speeds of 515 mph and 548 mph—for an average just shy of 532 mph, Motor1 reported.
'She Was Truly My Unicorn'
One of her ex-colleagues, former "Mythbusters" host Adam Savage, said he marveled at how Combs was able to navigate in an industry that is often a boy's club."She was a valued colleague on 'Mythbusters,' and an excellent science communicator," Savage said. "We are poorer for her loss."
Terry Madden, Combs' boyfriend, said he was making plans to honor the late race car driver.
On Wednesday, he posted on Instagram to express his sadness at losing the woman he loved.
Combs and Madden were filming a documentary together. Madden still plans to finish it.
He said he was there when her car crashed and that everything "humanly possible" was done to try to save her.