Organisers are cutting up to half an hour from the Olympic opening ceremony, Sky News reports.
A spokesman for LOCOG said the decision to cut down the show, which is due to begin at 9pm next Friday, came after rehearsals at the Olympic Park ran over the allotted time.
A spokesman said the scenes are being tightened to ensure it finishes on time after concerns were raised that the audience would not be able to reach transport links afterwards.
"We have taken the tough decision to cut a small stunt bike sequence of the show - we will be paying contracts in full and giving full credit in the programme," the spokesman said.
Locog denied the decision had anything to do with the G4S staffing and checkpoint concerns.
The show has been designed by British movie director Danny Boyle.