Zweibein-Einziehfahrw. 90°dre Graupner 176 Pneumatically operated retractable under-carriage units for power models with a take-off weight of around 5.5 kg. The retract unit Order No. 176 is designed to swivel the wheel through 90° as it retracts The pack contains a set of pneumatic retract units, pressure tank, valve, hose, connectors, small items. Wheels not included.