:o)
A quick eBay search yielded this gem of information, for any other clowns and wierdos out there:
16” – This is a children’s unicycle, the small wheel makes it only suitable for very smooth areas. Best used indoors or on smooth ground; not so good outdoors especially if it is rough or uneven, good for learning for 6 to 9 year olds.
18” – Also for children but because of the bigger wheel size this is great for tricks & stunts. Good for learner/intermediate riders between 9 & 14 years old
20” – Traditionally the most popular size of unicycle. These are great indoor, they turn quick and the best size for tricks… sort of the BMX of the unicycle world. They are great for unicycle hockey or basketball
24” – This is a common size among adults. Good for outdoors on paths, off-road and open areas although it can be a little bit big for indoors unless you have access to large hall or gym. The bigger wheel can make some of the advanced freestyle tricks harder.