Only tube I can find is for a 25 inch tire for a 9 inch rim. I tried using a hot patch but it peeled off. After it cooled. The big problem is the inside is like teflon. I used a wire wheel on my drill to scratch it up then cut out two squar pieces of rubber. The first one is only a half inch bigger than the cut. The second one is two inches bigger. I just used what ever I had laying around for glue I figure I needed something that would flex with the tire. I used permatex silicone gasket maker. Ended up using the whole tube on the two patches. I still would like to put a tube in it. It just sucks the HD holeshots arent cheap. The fronts have plugs in them now. I dont know about the hd's I never had a problem with my kenda claws. Must have put over ten harescrambles on them. 2nd race on the holeshots things are falling apart.