What if Nextie kindly made us a supplementary, removable, one-sheet CF rim well to more inflexibly bridge the gap between the tire and rim? Even if the tire tried escape, there couldn’t be an explosion without something much more dramatic than what we’re seeing.
If none of you knows why that wouldn’t work, I can take measurements tomorrow.
Even jerryrigging two or three rim strips together might offer enough of a tension bridge.
Can somebody with both a Nextie rim and a Stealth2 measure the outside rim diameter on both and post their findings? I’d be interested to know whether they really are the same size or not.
So it looks like this rim is a POS, for those of us who took the chance and got screwed, what are our future options? Maybe the T-monster will actually function with this rim. Alternately, I wonder if the bead can’t be glued to the groove. Aside from the cost of a tire, what do we have to lose?
Will anyone try the split tube tubeless setup to test if it is true what I said before? I tested that the rubber tire pressed against a rubber covered rim makes a strong bond that prevent any blown off. I remember making a video of the tire+the half tube so bonded together that I was able also to inflate them WITHOUT the rim (aroud 15 PSI they finally separeted)… so consider it
Theoretically, there would also be another possible scenario to test: go tubeless with a tire insert…
Well that sucks.
I was really hoping that I was just doing something wrong.
I don’t get it though. If Nextie can’t create a rim suitable for the Nightrider Lite, why bother dragging us through all of this shit?
Can they just not make the rim as big as the Stealth II due to machine size limitations?
In terms of options, I’m not personally prepared to try a split tube, glueing, or tubeless - it’s just not what I wanted this rim for.
If I could get a T-Monster then I’d give one a try (as I can use the tyre on another one of my 36" wheels whatever happens), but I can’t, and the whole hooked debacle would still been a waste of time in that situation.
Robin, Terry, sorry to hear about these failures. How old are your Nightrider tires? How often have you put them on and off and how many times did they blow off before? I’m just wondering if they are already too stretched out and it would work better with a brand new Nightrider. At least with the Braus rim, I started with a new tire and it has been very relieable around 40-45 psi. I would be surprised if the Braus and Nextie rims are very different in that regard.
Even if that works, that’s still not normal. Have you ever heard of any other type of bicycle tyre being “too stretched to safely use”?
Of course it’s not ideal, but as long as you can make it work in a reasonable way, I don’t see a major problem. It works for me and I guess also quite a few others. As I said before, I would rather see better tires 
The Braus rim is clearly a different situation. Yes there have been some issues, but nowhere near as bad as with the Nextie rims. Now whether that’s down to the narrow width, or differently sized dimensions (BSD, wall height) I don’t know.
My tyre had never blown off before, and only been re-fitted twice (no punctures since I’ve had it).
If we’re suggesting that such a tyre stretches over time then surely the same thing would happen with a new tyre on a carbon rim over time. For a hookless rim there’s nothing stopping that from happening.
I would also like to see better tyres, but as I thought had been hammered home to Nextie, we basically all want a reliable carbon version of the Stealth II to allow us to use our existing tyres, but save weight.
Sure in 2-3 years maybe we’ll have new tyres that will work with these rims, but it’s hard enough buying current tyres half the time at the moment.
That would be actually very interesting to investigate. Disregarding the hooks, the difference in width seems to be the only major design difference. I guess the wider rim equals more air volume, which means you should run a bit lower pressure. Maybe someone can calculate this.
Thanks for sharing, in that case I also think that stretching is not the issue.
I’ve been following the hopes and fears here of those with skin in the game - and I can only imagine the disappointment and annoyance this has all brought about.
It really feels from my casual observation a mix of failure to actually test the tyre with the set ups exactly as a unicyclist would mount / ride the wheels as… and I did find it alarming that Nextie declared the NightRider tyre was out-of-spec.
That may be technically true, but again seems like an odd way round of decisioning how to design a product. (Not to mention a bit of a snub to Roger / Nimbus etc!)
In truth, it feels like it was designed with the Vee Rubber tyre or tyres yet to be invested in mind.
I have been musing over the Braus rim mainly due to the vote of confidence (as I take it) by it being listed as a purchasable item on UDC UK (as I don’t believe they’d sell stuff that’s suspect or dangerous)…
But all the points here lead again back to a slight worry of a loud bang and injury while riding which is probably simply not worth the cognitive load for any unicyclist to endure.
Hope people can get refunds / a serious post-facto investigation!
The tubeless version was simply designed around the 36" spec. It’s clear they never had a tyre in hand to begin with.
The hookless version was then basically the same - designed like the standard hooked rims they make in other sizes, with a slightly modified hook shape and slightly higher bead lock to try and make it work for the NR/NR Lite that they eventually got from UDC China.
Perhaps they just have had a fundamental misunderstanding of the state of 36" tyres and had concerns that if they make a rim to ideally fit the NR it won’t work properly with the possible future modern process tubeless 36" tyres made to very tight tolerances.
When in reality the primary market for this rim is current 36" owners who want to upgrade, primarily with NR tyres or others made with the same exact machinery and process.
If/when modern 36" tyres come to market the whole situation will change, but they’ll have missed out on years of selling an upgrade part.
Oh, and the Braus rim does seem a better bet, but it’s by no means problem free. Blow-offs can and have happened with it.
I think the narrower rim with the same tyre could be the really significant thing here.
Intuitively at least, and having not actually see this(!), I would think the component of the force pushing the bead into the hook (normal to the plane of the wheel) would be less for the narrow rim just because of the geometry (the angle it makes is further away from 90 degrees). That and the way the tyre was ‘ballooned’ out over the narrower rim, especially with the low wall, would make it easier to roll the tyre off.
Alright, I was curious. Starting with a (measured) 57 mm width Nightrider tire on my Braus (28 mm internal). Adding 7 mm of rim width for the Nextie to the circumference results in a 59.2 mm wide tire. Then, with Barlow’s (pressure inversely proportional to width), it means you should run 96% of the Braus pressure on the Nextie. Not a huge difference. Of course, that’s very theoretical with many approximations.
I tested alsonthe tire insert. It is valuable only if plan using it for dampening on roots, muni 36ing or similar. If you just need it to ride safely on roads, than you are counteracting the carbon’s weight loss. So if you use your 36 for muni and downhill go with the tire insert. If yoo choose the tire insert for road… it is a wrong choice. And I made exactly that mistake before removing the tire insert from the 36"
I fail to see any actual logic in placing the blame on Nextie here. Be upset yes, go for it - but really, where’s the reasoning?
Even for the high hopes a hooked version would cure.
We have a correctly engineered rim to an international standard. Produced by a company that knows what they’re doing with tubeless CF performance rims. That have also been very polite, investigative and bent over to make modification.
Or we could have have an actual legitimate unicorn.
A rim engineered to fit around an undisputedly inconsistent rubbish tire. From a single factory which has a fairy tale story as it is, which we have had to indifferently suffer.
Patience may bring about a decent, tubeless tire in the future. Maybe this current energy can be redirected to a petition for a reputably manufacturer to bring us a consistent quality 36" tubeless ready tire?
Because as far as I’m aware nobody wanted the hooked rim for anything other than to work with the Nightrider tyre (and others made with the same casing - everything other than the Vee tyre AFAIK).
If they’d just gone ahead and said “no we won’t make that because it would require making a rim that’s not to normal standards” then that would be fine.
What instead they’ve done is made a rim which they claim is fine with this tyre, and so far it seems that it’s not.
The hookless one is a different story. Ideally I think Nextie would have done more research into the tyres before they produced that one, and then they could have been clearer about what it was and wasn’t made for, but they’ve made a hookless tubeless compatible rim for 787mm and that’s fine.