Okay! Let’s see if @Sexy still has those 75mm cranks available. . .
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Yeah, if you PM me your address and an offer I can send you a shipping quote.
I got the brake mounts I needed kindly for free so a second set is available
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My small wheeled unicycle got a v-brake. Details about the Magura → v-brake conversion can be found in this thread. Quite a fun and successful project.
It looks happy doesn’t it ? 
I missed the brake. All my bigger unis have brakes.
It makes the downhill parts much more relaxing.
Whats next? Probably shorter (that the current 89mm) cranks…
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Is there an advantage with traditional v brakes as compared to magura brakes or is it just that they are harder to procure?
75 mm on 24" is very fun if i do say so myself.
The v-brakes gives more room for adjustment. The Magura HS (hydraulic v-brakes) only fit if the rim width is “right”. So if running a narrow rim like me the pads simply cannot reach the rim. I believe I have tried in the past on this unicycle with a HS11 (which I have since sold). You can source special adapters like these but Brexit makes it a very expensive experiment that does not guarantee to solve the issue. And installation of the v-brake was probably ~20€ including various hardware, the brake and the lever. Cheap, fun and effective.
75mm is tempting
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Both 29/89mm and 24/75mm might be fun to try out, but personally I would not stick with these combinations. I doubt I will ever get the speed advantage (especially downhill, where I am actually faster with 110mm!) and uphill climbing starts to feel really awkward.
I did start to get the proper technique of non-staggered climbing with 29/89mm in the end though, and the pedaling resistance actually feels awesome. But my knees protested after a week with that setup, unfortunately.
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Look at this tiny, little, micro machine I cycled in on today. I include a chair here for reference.
And yes I need to buy a bigger saddle.
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How long did it take your son to learn to ride unicycle? Where did you get that wheel? Is that a 16" you let him ride on or a 20 inch? How old was ur kid when you taught him to ride unicycle. My boy is now 4, but all my unicycles are too big. My daughter of 11, who is Thai, doesn’t even fit on my unicycles even with the seats all the way down. I don’t want to saw the pipes.
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He can’t yet. But he has loved sitting on top of a unicycle being pushed around since he was 2-3 yo. He is now 4 so I got him a 12" with a cut down seat post, just so he can reach the pedals at least. I am still holding the saddle upright for him and don’t expect him to actually learn this for a year or so.
The Micro Menace you asked about is 16" and to large for him, even with tiny 45 mm cranks. Unfortunately we won’t be having any family excursions on that for many years. 
I might soon look into how I get him to learn to balance on that 12" tho, but I am not going to rush things.
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Lets give my smallest wheel and my longest seat post a go!
Starting with the only setup that lets my son reach any pedals with cranks longer than 45mm. 12"/89mm and the shortest seatpost cut even shorter:
This was rather tricky but unexpectedly doable. I have actually tried a 12" before on Jordalslekene but then the seat height was about twice the length.
So is it even possible for a 183 cm guy to ride the 700 mm seatpost without cutting it down?
Just barely, with the post rubbing the tire, on my toes and kinda jiggling from side to side, streching as much as I can! I guess 75 mm cranks would have been slightly more ridable (and made more sense I was struggling with pedal strikes when turning!), but I cut the post a bit nevertheless and put on a proper saddle.
So I gave this crazy 12"/89mm machine a 1 km spin yesterday and that was quite something. I was having a hard time not to let others simply walk past me. And when trying to go real fast, that is past 8 km/h or 140 RPM, I just had to jump off in the front since it felt so unhinged.
I don’t think I am even going to bother with 75 mm cranks on this nanomachine. I’ll be moving straight to 45 mm if they even work anymore. I guess I will try a 3 km ride, or maybe even 5 km like @Syoten (oh and did you give shimming your 50s another go, as discussed far above?), but furter than that can’t really be any fun at all. Speed bumps and curbs are challenging enough even on 89s. And 45s won’t really make matters better.
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it is very well done. I’ve once tried sitting on such a small micromachine, but I don’t fold like that 
Next to the tiny uni they also had a giraffe. I could sit on it just fine, but I chickened out when pushing off from the wall and take it for a spin. It is quite high compared to normal unicycles. I also find my 36" very high to sit on. Sometimes I wish my eyes were at feet level, then it wouldn’t be so high
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but what was the reason you decided to buy this small uni? I’ve thought about buying one for my kids, but the smaller the wheel the more twitchy. I think I’d better wait until they are tall enough to ride a 20" uni. Which for me is also very twitchy compared to the 26 or 29".
This is the only unicycle that will fit a 3-4yo. On a 16" I just can’t get the seat/inseam low enough for him.
yeah but I figure you bought the wheel for yourself initially?
My boy just learned to ride a bike and occasionally plays with his kick scooter. He needs to build up a lot more strength in his legs. My daughter is 11. She is at a better age to give unicycling a try. I just don’t want to saw off my saddle pins. And I could of course buy an extra uni just for her, but kids her age, especially she will quickly give up when things get harder. Unicycling is not something you can learn in one day.
unicycle.com should really make a 16“ in Nightfox style!
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Today I got a pair of 75mm cranks for myself. I threw them on my 20" uni and so far I’ve been enjoying it! It still feels somewhat strange but I think I can get used to it 
I’ll have to try them on my 26" wheel sometime
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A friend lent me his 20", so I could finally try some proper Micromachining! 
The seatpost was to short, but luckily I have a new seat post for my Coker handlebars I haven’t cut down yet. So now I was ready to try the @Wheelou setup, as it had 100mm cranks. And I have to agree, this was challenging indeed. It was like treading air and all the movement made my legs numb.
So I put on some 89s like @pierrox instead. And this was a pure joy! I can do absolutely anything on this machine, and it was easy to push to 15 km/h. I even enjoyed some light Muni!
This was great fun and I could even ride backwards and just fool around. Speed bumps and curbs were no challenge at all after riding the 16"/75mm combo. This was soo satisfying.
I will definetaly try 80/75mm cranks but I think I will be happy with and enjoy the 89mm setup more actually, for the increased versatility. For instance, I didn’t struggle downhill, which night be an issue on shorter cranks.
I can totally get why @SirCranky has spent so much time riding his 19". We really have to do a Micromachine trip this Easter! 
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Congrats, that‘s two more crank changes for your collection 
.
I agree with your micro easter round, though - normal riders will be able to keep up with their 36ers…
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If 20" is a micro machine, I ride a micro machine everyday to school.
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You would need short cranks for it to be a micromachine. Definitely 100 mm or shorter