Redline flight expert xl bmx bikethe r7 frame on redlines flight expert xl bmx bike has been designed to cope with the rigors of highly competitive bmx racing its not inconceivable to think that this could be one of the most technically advanced alloy race bikes in todays market with its redline formed r7 tubing press fit bb 86 redline convertible dropouts and combination of first rate components micro adjust pivotal seatpostthe flight expert xl bmx also features the promax brake system s