anyone think a KH onza hub and onza set could be done on a 12"?
custom cut down a 20" frame and get a extended seat post 
Only prob i see is getting a good rim, or would a standard steel 12" be strong enough?
why do u want a 12" unicycle?
I bet you could do it but another problem would be finding a 36 hole 12" rim. Also the cranks would be way long…You’d hit the ground every 5 seconds. A Koxx One 12"er would be more feasable. They have a very larger range of sizes in cranks, the shortest being 90mm.
-phil
didn’t think about crank size, what the smallest splined crank you can buy?
i still dont know whyy u want a splined 20"
and i think u can get koxx 90mm isis splined cranks
wat would u be using it for. it would be faster to hop around on a 12" than roll there so small.
everything from hops to drops
It’d be the ultimate novelty uni.
The ultimate waste of money in my opinion.
dont waste a perfectly good splined hub on a 12"
build a 12" with a clotterless hub and cranks t6heres no point spenmding £100ish on a 12"er
If get non heat treated cranks ( I know none.) you can get a competent welder to make you like 70 mm cranks
It’s rather like bronzing a gold medal.
that would be stupid, and a big waste of money.
the koxx cranks are solid aluminium from my memory, therefore you could shorten them rather easily so long as you can get a new thread (for pedals to go in) machined closed to the hub end of the cranks.
but yes, quite a pointless thing to do. i’d still love to have one 
or you could cut out the middle.
but still a stupid idea
I see stupid, waste, and pointless used a lot in response to the initial post. All I have to say is what a cool idea this would be to try. It might work. Maybe there’s something advantageous about it that no one has explored yet. Since we don’t understand it, let’s ridicule it…or fear it. I wonder where new ideas and things come from.
At the end of the day, it is ridiculous and money waisting. But everyone loved the 12" at BUC and it’s be the ultimate custom
hear hear, harrumph harrumph and waving of papers in agreement - beaten to it, in a more eloquent manner no doubt. They are also ridiculing an idea within an already ridiculed activity.
I’ve got at least two pointless, waste-of-money ideas which I will definitely be trying at some point. Both will be impractical, relatively expensive and possibly of a weak construction. Both may be difficult to ride. BUT they will look different, be fun and may develop to other things.
it would be better to use a KH/Schlumpf hub in there, you still get the ISIS splines, and then you can gear it up to 18" for when you want to cover some serious distance between trials sessions
OR, I could just PM you my address, and you could send me your paycheck!
Hey, I just had a cool idea. I should put a schlumpf bottom bracket on my giraffe!
Do not listen to anyone who says that doing this would be pointless or a waste. You KNOW that all of them would line up to try riding your 12" Onza, if you had one. So if you’ve got the hub and the parts and the time and the will, go for it. Practicality isn’t one of the highest priorities in this business anyway… I agree that a regular cotterless hub would probably be a more logical choice; finding the other components to build a trials-capable uni will be a challenge. There aren’t very many 12" rims around - none that I’ve seen, anyway - that will be noncrappy enough to justify such a beefy hub, or have enough spoke-holes to carry it. And, the selection of 12" tires is not very wide. You’ll need a bunch of custom parts for this thing, most obviously the cranks, which are almost certainly not going to be available in the 3" or shorter length that you’ll want. Probably spokes, too.
My 16" MaxDaddy had custom 3" cranks on it, which were about right for its size. They were ordinary cotterless ones of course, cut down from bicycle cranks.