... tires. Refer to page 130. Due to the high speeds this vehicle can reach, the use of specific brands, spec-ifications and sizes is mandatory. Consult any BMW center for details. Comply with ... impaired if improper wheel-tire combinations are used.For this reason, use only tires of the same brand and tread pattern. In the event of a flat tire, for example, remount the approved wheel-tire ... (arrow).460de154The rear backrest section will move for-ward slightly when it is unlocked. Reach into the gap and pull the backrest down.When you close the backrest, be sure that the retainer engages...