Awesome project, but I’m really bummed out he’s openly supporting that piece of shit company
this post was submitted on 01 Aug 2026
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Oh, was it sponsored by Bambu? Sponsor block might've caught me there. I was sorta dissapointed when I learned he'd moved from Prusa, as that is where he started.
Oooh, if that algae-derived TPE would just hit the market already... 😍
Yeah, but he concluded that they kinda suck. At least version one. Fun project, but pointless?
I bet if you asked, Seth would make the stl available.
He'd like em a lot better, if he took the tread off and stuffed them inside a tire. Still wonder to this day how mountain biking hasn't picked up on Mousses. They came pretty close with those cush cores, but they still weren't really meant to be run flat. I run mousses in my dirtbike, and they generally kick ass. A big miserable to install the first couple times until you get the hang of it, but awesome.
You kinda run into the same issue as runflat inserts on cars. They make the wheel a lot heavier, bad for something human powered. Rotational mass costs more power to move than mass on the frame.
It lighter than a tube on a dirtbike. It makes the rotating mass less.
On a mountain bike the amount of material you'd need would definitely be a little bit of added weight vs tubeless. But it probably wouldn't be a whole lot more substantial than tires full of sealant. Certainly wouldn't be any more than these doubledown sidewall tires, which would be substantially heavier. The only way they fail is if the tire fully comes off the bead. We use rim locks on dirtbikes to prevent that, but dirtbikes also weight 250 pounds, and they produce a lot of power under throttle. You wouldn't need that with a mountain bike tire.
It would beat flat tires trailside, having to constantly reinflate a tire that's been sitting, and it would eliminate the mess of sealant.
Even without a tire over them, they weigh more than the heaviest tire on the market. So, yeah. Exactly.
Tyre insert fad has been and gone over the last few years. There are a shitload of options, not just cushcore.
Decent tyres are better than an inadequate tyre with something stuffed inside.
Dirt bikes are so much faster, heavier and powerful that comparisons with mountain bikes are mostly unhelpful.
So faster, heavier, more powerful, but the comparison isnt useful?
Just so we are clear, I don't have any air in my tire. No tubes, no messy sealant, no tubeless. It's a foam core. It can't go flat, and you get traction for days. It's not cush core, or any of the alternatives, which is where I think they went wrong, because those all still require air. Air is one of the biggest, if not the biggest failure on a mountain bike. They don't weight all that much either, I'd take an extra few ounces of rotating weight vs futzing with air trailside.
Oh, like rc crawlers inserts? Makes sense.
Yep. I use inserts on my on road car rc racing car too.
his point made sense. tubeless is "good enough" that there isn't a demand nor market for airless 🤷♂️
I generally like traction.
Afaik you could buy airless. It has been a commercial product for decades.
first thought without opening the link:
what if you drive through dirt? will it all clog up and feel extra shit?
The sides are open, why would it clog up?
Because mud will do what mud does and clog any opening smaller than a few inches wide?
It'll get squeezed and/or flung out the next revolution of the wheel though
I can't even clear up regular spokes fully by going 40kmh down a road because of the clay type mud we get.
That’s relying on air alone, the mud on your spokes doesn’t receive much if any additional shear forces.
I meant while biking down a hill.. If riding squeezed out all the mud then that means the runflat tire is... Flat...
That sounds very bad for many reasons