A 47-year-old Tauranga woman has been airlifted to Waikato Hospital after a motorbike collision with another rider at the Hampton Downs race track.

Waikato Westpac Rescue Helicopter Trust said the woman was doing 180km an hour when the accident occurred.

"She was thrown from the bike and landed on the track, sustaining multiple bruises and abrasions, and possibly a fracture to the hand," the trust said.

She was flown to Waikato Hospital with her partner.