This thread has 134 pages of Schlumpf discussion, spanning almost a decade.
I recommend buying a unicycle with a larger wheel. It won’t cost much compared to what you will spend on your hub, and that way you will be safer and get the most speed out of your investment. Your 24" muni can definitely be Schlumpfed, though. Search the forum for “g24” to find out about others who have gone before you.