Gen 1 -no support
My nephew has the first gen model and it is no longer supported. I learned this the hard way when I ordered replacement wheels that did not fit. The company indicated I would have to find a solution myself, and honored their return policy (minus cost of shipping). I ended up buying pneumatic tires, stripping off the old rubber from the existing rims, and making the new tires work (needed modification for all the screws). My nephew is very happy with his new wheels.