My favorite tire , which is proven to me is the Toby Sexton aircraft recaps , the plys are 28-32 , the side walls are just as thick , they have a tube in them but will hardly even go flat , when you first get them you have to buy the rims as they are split rims which bolt together , once you have the rims the casings arecapable as long as you don't let the threads get exposed , the local shops charge about $125 to cap the 7series style which uses a A-10 Warthog tire , the 8 series go about $155 and use a F-18 tire , the really good thing about this tires is runnng tracks on top of them , as if you do get a flat I can split the rim with the tracks in place and get the tube out make the repair or relace tube and not even distrub the track, on the side the tire they have a warning , only good to 210 mph landings