I have heared that the stock wheels are to small for grass landings withe the aerobird challenger. What size should I use? I only land on gravel now and the stock ones are good, but I will need to land on a mowed grass area with the club soon. thanx for any mod's and ideas. There are so many wheel sizes, I'm not sure where to start. And can I put then on the stock supports, or do some custom work.I really don't want to belly land. I find gear landings more fun. Thanx for your input.