I am going mountain unicycling this summer and was wondering if I should buy a 24" mountain unicycle. ...If so, which one (not too expensive). I already own a KH 20" right now, so should I use that... or whatever.
What sort of terrain will you be riding on? The term mountain unicycling covers a lot of different types of riding, each of which will be suited to different wheel sizes. If it's mostly 'XC', or a bit of everything, then you will probably be better off with a 26" or even a 29", whereas if it's mostly rocky, steep and has lots of gaps and drops, a 24" will be ideal.