Mad4one muni frames

UDC weigh frames with bearing housings and bearing house bolts. It is the way we have always done it as it what you get when you buy a frame.

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Really ?

That is because that is data given from Kris.

This is highly off topic and several yeas in the future, but I am really trying to decide if I want to get a mad4one/KH 29 or just get the Nimbus 32. I do 95% of my rides on roads (currently doing 1-8 miles on a 26" Torker with KH freeride saddle), but I love having the ability to ride on gravel and dirt. Does the Nimbus Oracle 32 allow for this versatility or would I want a mad4one or KH for going off road from time to time?

I have been having thoughts along the same lines. The tire on my Oracle 27.5 rubs the frame under load which is annoying.
I was thinking of getting a smaller tire but then I was also wondering about getting a larger frame too. I noticed the mad for one Muni frame L ( Frame Mad4One Muni and Distance L 26"X4.00 - 32"X2.25 ) States it will fit a 32 x 2.25 Tire which is what tire the Nimbus Oracle 32 comes with.
Seems pretty versatile I could get more clearance for my 27.5 x3.25 wheel set or I could decide to go up to a 29 or 32 in wheel in the same frame if I wanted to get into Road distance riding more, plus I can get the frame in whichever color I like the most. This definitely seems a lot more versatile then an oracle frame…

I have 3 L Muni Mad4One frames for my 27.5x3.25 29x3.25. And 32x2.25

Perfect clearance !

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I installed a Crux Duro 3.25 on my M41 27.5 and one side did rub against the inside of the frame. The knobbly bits on that tyre make it quite wide at the extreme edge, so I just snippet off about 2-3 mm of the rubber, using side cutters, at the widest point and no more rubbing.

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Maybe there has been some frame developments since 2017 when most of the posts in this topic were made. Anyway, I would like to add one data point…

I have a standard Nimbus Oracle 27.5, which has an aluminum rounded top frame, “proper” disc brake, Duro Crux 3.25 tire. It is about a year old. The frame seems designed for that tire. Clearance between tire and frame is more than 4mm at all points on both sides.

Medium ?

or Large ?

Don’t recall, but it’s about 90mm so that makes it M.

I guess I never really thought about doing that, it’s certainly a lot cheaper!

I wish i had that much! Mine is about 2mm on both sides. I bought mine about this time in 2021, after they were out of stock for many months, which suggests they wrre a new batch.
Might just do the snipping trick. I noticed it stops doing it when the tire pressure drops over time to a lower pressure than I prefer, so it doesn’t need that much more clearance to make it go away.

Still very small clearance even after trimming.


Here you can see how much was cut

Compared to uncut 29" Duro

To cut more I’d need a better tool than side cutters. I did try grinder and rasp but both slow and ineffective.

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Thanks, very helpful!
I was thinking a random orbital sander might work well, but I now suspect it wouldn’t, if a grinder and rasp didn’t work out so well for you. Maybe with a very coarse grit might help, perhaps if only to clean up the cuts a bit afterwards.

Has anyone tried the latest revisions of Mad4One Medium frame with Duro Crux 27.5? What is the tire clearance?
In @BruceC pictures Crux is too large for his frame, but that’s a bit strange, because stock Mad4One unicycles are sold with Duro Miner 27.5x3.25 frame

Be aware there are many Mad4One frame sizes. @BruceC seems to have a M size, which normally does not accept 27.5 x 3.25 tires. L size would be perfect for such a tire, though.

So they sell size M with too big 3.25 tire for this frame? :thinking:

Well… The best way to know whether that’s a glitch would be to ask @MAD4ONE directly :slight_smile:

It does seem that M4O gives you the option of a Medium or a Large frame with that unicycle, so the Duro Crux (Miner) should fit in a medium frame, although it might just BARELY fit. I have attached frame dimension schematics below, which show the dimensions of the medium and large frames.

The M4O medium frame forks are 92mm apart where the tire clears the frame.

The M4O large frame forks are 105mm apart where the tire clears the frame.

A 27.5x3.35 Duro Crux is 80mm wide at its widest point, or 3.1 inches.

I have a 27.5” Nimbus Oracle with a Duro Crux, and the tire rubs a tiny bit on one side when I am riding up steep hills. I have wished for a few more millimeters of clearance, although it is a minor rub that I normally don’t notice. The Oracle frame also
provides 92mm of space where the tire clears the frame.

Given the choice of a M4O medium frame or a large frame to use with a Duro Crux/Miner 27.5x3.25, I would choose a large frame, if you have a long enough inseam for that. A M4O large frame will hold a 32” tire, so your inseam needs to be long enough to ride a 32” unicycle. M4O does provide the option to customize the neck length, to match inseam lengths.




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+1 on this, my Oracle 27.5 also rubbed my frame with the Duro Crux, but it was more than minor, it was pretty bad, it would rub even on flat ground. I ended up switching to a smaller (2.8 WTB ranger) tire to resolve that as it was really bothering me.

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