I had a problem with flat tires and have 2 solutions
the flat
first solution came from hotwheels000 this is site
http://crawlerinnovations.com/index....mart&Itemid=64
and the result
i emailed them and they recommended a foam it worked real well
the second was to foam fill exsisting tire i am on 3 trys with that will update with out come i think i can get it to work