new since jan 06. have a great planes giant with 4" du-bro wheels with 18" prop. on the g-38 which i just started to fly. prop and muffler don't have much ground clearance so i ordered from tower the 51/2 non -treaded scale du-bro wheels not so much for looks, but some more clearance the question being is this going to change anything on take-ofs and landings i am not looking for more challenges at this time. would like some thoughts. thanks larry