http://www.gizmag.com/edison-puton-monowheel-cholmondeley/22767/?utm_source=Gizmag+Subscribers&utm_campaign=2cfd6f22cd-UA-2235360-4&utm_medium=email ezeket miert nem porgettyukkel kormanyozzak ? sokkal stabilabb lehetne es biztonsagosabb is. bye dexter