I have owned my BX 23 dfor a little over a year now.. In this time I have had to replace 2 tires and fix about 15 flats. Granted I have been working my BX23 very hard to say the least but I would like to put an end to my flats.. I was thinking that I could drill a hole in the tire itself and fill it with cement. then patch the hole in some way when I am done.. I was wondering if anyone else had ever done this before.. I know I can send them out to be made solid but I have to wait 3 weeks for them to come back and it will cost as much if not more then new tires. Any suggestions?