ISIS hub Product review.

Post any ISIS hub product reviews here.

I will start.

KH Moment
bent the Flanges ugly.
the KH drilled into the side of the hub is too excessive and weakens the flanges of the hub. It would be smarter to not drill any holes at all. bump up the weight very slightly but increase the strength significantly.

Koxx ISIS reinforced
bent the flanges too. Same thing, Koxx needs to drill smaller holes. Also, the flanges of the hub need be set wider like the KH or Nimbus hub. Unicycles put a lot of horizontal pressure on the wheel unlike bicycles.

ISIS is an industry standard of being very strong and flanges attached to ISIS hubs should be at the same level of strength for both KH and Koxx ISIS hubs.

Note: I am 150 pounds.

oh ya,
I could see there being strength in having the flanges of unicycle hubs angled in to begin with.
But I dont know the logistics of this manufacturing process.

Nimbus ISIS:

Never had any problems with it, little holes in the flange, nothing bend.


Same problem as you had.

Koxx ISIS:

Had no problems with the hub, only with the cranks (bend after one drop)


No problems so far, smaller cutouts at the flange.

I have also had bending issues with the Moment hub. But who hasn’t?
Never had any bending issued with my K1 reinforced.

I think I remember hearing, sometime ago, that the bending in the flanges was intentional. The purpose was to have just enough give so the spokes would snap less. My speculation says– that if this if true, its happening to a more extreme level than it should be. The biggest problem is that is bending so far that its allowing the metal to fatigue. Also making it a challenge to lace spokes through a bent hub. Bending it back will only fatigue the metal further.

Bearing problems on KH moment and QU-AX ISIS, the tighetening of the bearing on the axis can be lost and bearing move against cranks with hight mechanical noise ! I had it on 3 of my 4 bearings (with KH and QU-AX hubs) ! The solution is to use special glue for bearings but if you don’t repair it very quickly, your axis is marked and weared, so there is no tighetening any more … It could be useful to use sleeve between hub and cranks in order to avoid crank/frame contact, but in this case the sleeve should be a litle bit shorter than the clearance in order to allow the correct crank fixation on the ISIS groove of the hub.

Kris HOLM told me that is due to poor QU-AX bearing quality and that’s why now he is doing his own bearings (green plastic sealing instead of blue for QU-AX bearing used by KH up to 2007 models).

I’m not sure it’s only a problem of bearing quality, what’s your experience and opinion ?


best hub ever torker square-taper

nimbus are pretty good hubs

i’ve taken 3+ drops and i’m 250lbs

It shouldn’t be difficult to manufacture, unfortunately no one has done it yet. The straight flanges are not a big problem w/ larger diameter wheels, however on a trials wheel the spokes are on a much steeper angle. It is unfortunate that unicycle technology isn’t progressing as fast as the sport itself. For istance, the T7 handle looks like something fabricated as a one-off in someones basement. It should have been improved after the first run. (Sorry for the rant, this stuff is not hard to build)

I’ll be seeing how my 08 kh moment hub holds up (the black one). It doesn’t look any different besides the color:(.

CF frames arent good. Very brittle. Smash it onto a rock, and it will be over very soon. Same with CF seatposts. A somewhat large hop or drop will crush it.

I think we are doing fine for right now. Kris is testing those cranks, so it at least shows him and others are still putting money into innovation that may fail or work.

We have moved to ISIS a while back. A lot of parts are coming out that is specified to one style. Titanium hub options, geared hub options. 36" aluminum frames.

Compared to bikes, we will probably never have as much as they do. There isnt as much demand, there isnt as many riders or money coming in to be able to throw around a lot of stuff. We are going slow and steady right now, and thats fine for me. There isnt too much going on that is putting a huge demand on making new parts and uni specific parts.

Unicycling will, I think, always be a minority sport with not a huge consumer base for expansion of products. The reason skateboarding, bmx and other extreme type sports have taken off so quickly is that one can quickly jump on a bike or skateboard and ride it and learn tricks. Many people dont have the patience to try to learn how to unicycle much less have any desire to do tricks on it.

Yeeeaahh, not true. Riding bikes may seem easy to you, but i rode for 2 years and i know alot about it. Bikes are just more visualy better to people, because they dont take unicycling seriously.

i disagree.
i see the hub design that we use now as very reasonable, we tried the keyway thing, but it doesn’t work for high end unicycles(obviously, way too many loose keyways, even some on the profiles)
and why go w/ something new when the bike industry has already developed some powerful stuff, there are similarities between us and bikers, figure that out and you’ll realize that ISIS hubs are awesome, and that bent flanges account for almost NO change at the wheel, we’re talking a 170mm hypotenuse to 40mm ± about 2mm side…

really… just adjust your tension a little.
when they break off you can cry about it.

Adjust the tension? As in loosening it to weaken the wheel, putting the rim out of true?

Its pretty bad to unbend the flanges just to pull the spokes in and out of the hub when lacing the wheel up. Its also bad when the flanges crack and start to rip away from the hub.

how many sets of flanges have you heard of doing that?

Having the rim pull out of true? Too many to count.
Needing to bend the flanges out to get the spokes? So far, everyone who I have talked to with a KH hub, even some with the Koxx hub.
Cracking and pulling away? 3.

I was wondering… The flanges are the circle shaped things the spokes go through, right?

Just bought a 125mm nimbus isis disc hub (the aluminium one). Strangely, unlike the steel hubs, this hub isnt drilled through, the crank bolt holes are drilled 60mm deep from each side, leaving a solid 63mm of untouched aluminium in the center.

For a weightweenie hub, this is unacceptable! (Roger or anyone involved in the design, was there a reason for this, be it cost saving or strength?) With the m12 thread, even if the center section was drilled through then not threaded, this would mean a 14g weight saving on a 207.75g (exc bearing & spacer) hub! :thinking:

What are you using that hub for? Muni? Let us know how it goes

Yes I am, however my unicycle and I only weigh 67kg and I havent been able to break the Qu-ax aluminium cranks, so perhaps I’m not too harsh on equipment.

Will certainly uodate as time goes on though!