Air-Ultra-Leichtrad50mm P2 Graupner 165.50 These wheels are extra-lightweight. The air-filled tyres have a shock-absorbing effect but keep their shape well. The surface of the tyres and wheels is high-gloss, dirt-resistant and fuelproof (even against two-stroke petrol/oil mixture). The grooved tread helps keep the aircraft tracking straight on take-off and landing. The tyres and wheels are of semi-scale design. Wheel diameter approx. Ø 50 mm Hub bore diameter Ø 3,1 mm. The centre bores can be drilled out by 1 mm if necessary.