Flxible was an American manufacturer of Transit Buses, Motorcycle Sidecars and custom coachwork for various chassis applications such as Ambulances or Hearses.

Almost every transit agency in the United States operated a fleet of Flxible Metro B's in the late 80's to the early 90's. Among the last of the true "high floor" designs, the Flxible Metro B legandary status is the subject of debate among transit fans due to its relatively short fleet life.

Flxible's rise to dominance begain in the late 1940's when the Clipper highway coach became popular. In the late 1970's Flxible capitalized on the success of the GM New Look bus by updating the design and playing on the key components which made it successful. In 1978 the company was sold to Grumman for $55 Million. Grumman acquired two prototypes for what would eventually become the Metro B. Grumman sold the Metro B under its own name as the Grumman 870. In the late 80's several transit agencies such as WMATA and NYCT began to cancel orders for their Metro B and 870 models because of difficulties with maintenance and cracks developing in the A-Frames which were not easily repaired. After a lengthy investigation it was later determined that the Metro B/870 was not capable of dealing with potholes found in many metropolitan areas and that this was the source of the cracked frames. After the cracks were discovered NYCT and other agencies were forced to take their fleet of Metro B/870's out of service until they were repaired. This defect was effected almost 3,000 buses across several agencies. It cost Grumman over $7 Million to fix all of them.

Toward the late 90's the market for high floor buses began to decline in the bigger metropolitan markets. Models being offered by the competition were significantly better such as the Gillig Low-Floor which debuted in 1996. The Metro B does however live on in the historic fleets of a few transit agencies because of its overnight.. "success". The Metro B had design quirks which were unusual and mad the bus look and perform awkwardly. The rear of the bus was much higher than the front, which caused the front to have an unusually low front axle ride height. This made the bus appear as if it was going to tip over when cornering.

Temporary Revival: In the Early 2000's WMATA began to experience severe difficulties with its fleet of Orion VI's which were known to catch fire for unknown reasons. WMATA decided to take all of its remaining Orion VI's out of service permanently. WMATA had planned to wait until its order of New Flyer Xcelsior XDE40 buses was completed. To fill this gap in service WMATA brought a several of its retired Metro B's back in service until the New Flyer order was completed.