Do not use the stock gear on this plane!! Way too short and soft as wet noodle. I originally had some universal 40 sized gear on mine ,then switched to the suk gear. Never had a problem on takeoff with mine short grass, long grass, pavement, it doesn't matter.(Saito 72, 14x4w, 30% cooll power) Swappatan31: ditch that 9x6 grab a 12.25x3.75!!!