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It seams EXT USA already has a page for selling Storia V4, found it through google, can't be accessed through link on their page yet:
https://extusa.bike/products/ext-storia-v4
My Nitro Mousses get flattened/squared on top after a couple desert rides or races (I generally ride 45-60miles any given day and races are 80-100) and it’s not the end of the world for another 3-4 rides because there’s a lot more traction on the dirtbike. After this the tire will start to roll or collapse in whoops and compressions which is too scary. If the mtb versions did the same they’d be unrideable and also wildly expensive. While the Dunlop Mousse is rather harsh to begin with it lasts a lot longer and holds its shape. I’d love to try mousse for DH racing but I’d venture to say the added unsprung and rotational weight would be very noticeable as it is even noticeable on my moto.
I feel there is a system we can make, especially for more casual riders, that will work way good enough but we are probably a ways off of replacing air for competitive use. I still think its insane in 2024 there isn't a flat-proof system for the top guys, but then again I don't know that we've seen a flat derail a good run among the top 20 in DH.
Completely off topic but I hate the Nuetech mousses for moto for the reasons you mentioned. I will only run michelin and get a lot of use out of them, and they are light. I'll never go back to air of any kind.
it said madone on it, very similar to the current one but slimmer.
Trek Mad One.
Daemon but pronounce it demon
After working in a handful of Trek dealers in my life, I believe it’s called a Trexs Madrone.
Ibis supposedly launching a new Ripmo (and possibly other models) next month that mimics the design language of the HD6. REALLY quiet out there though which is unusual being this close to launch. Anyone hearing anything new?
New Ripmo with straighter tubes sounds great!
Having worked directly for the mothership , I hate Terk............so much.
Before my pb account got suspended, I photoshoped a straight top tube Rimpo AF. Looks so much better, but I didn't save the image offline
https://andreaniusa.com/product/supermoussepac1-l/
Someone is already selling mousse for mountain bikes, I will not be trying it but maybe someone on here would.
Yup "like water" is redlines 0wt product and actually what fox rebadges to use as their seatpost fluid (although they call it 1.5wt). Crazy low viscosity of 4 cSt and insanely high viscosity index which was very very stable at high temperatures (which I tested here https://tinyurl.com/4ucjdsc7) which is good for something like an off road truck but not mtbs where the operating ranges are much smaller. The downsides are those kinds of oils oxidise really fast and turn your internals dark brown, plus they tend to be super noisy.
Oils are a useful tuning tool for some dampers - but not all of them respond much to changes in viscosity so you will get mixed results. The trade offs of using different oils can be risky too, especially if its not being changed regularly plus you need to track what you used so it doesn't get changed out in the next service!
"I will not be trying it." lol
Yeah its something I've wanted to put some testing in to, but unless you have a specific resonant frequency you are needing to eliminate then it won't help (or make it worse)
They were made famous in everyones favourite birthplace of technology (F1), where tyre vibration was a real problem because the suspension is so stiff and the regulations normally specify a minimum tyre pressure (which would in theory help dramatically), they needed another way to deal with it. It could maybe benefit push bikes, but would need to be easily tuneable and also be sure that you aren't masking an issue that could have been fixed in a different way
I suspect I'm not making a great analogy here (sorry, not my field!) but this is the first thing I thought of and obvs had to say it out loud
Derailing obviously... Renault used a TDM, yes. As far as I read into it, having the force on the tyre in F1 as constant as possible gives you the best grip, any spikes in the loads influence this. So they were looking for a platform that would be even more stable. The suspension is basically rock solid as it's there, primarily, to support the aero platform. In the olden days (13" wheels) the tyre was an essential part of the suspension, less so with the move to 18" wheels (the sidewall is smaller). It was never mentioned that the TDM tuned out the own frequency of the tyre, but it could be used because of that.
Anywho, the FIA outlawed it under the 'moveable aero devices' regulation at the time as on an F1 car technically only the unsprung components can move, but in reality they did not want to have cars with 25 kilo weights suspended in the nosecones. The lack of a TDM was later solved by McLaren who pioneered the inerter (which resists acceleration and effectively makes the sprung portion of the car, from the tyre standpoint, much heavier through it).
They also solved it with the FRIC hydraulic suspension that was also subsequently banned. F1 has a unique problem because they require such incredibly high stiffness in heave (the entire chassis going down relative to wheels) but are forbidden to connect the front and rear suspension together, because rules.
Somebody on here or on MTBR did a test of bolting an inerter to a rear shock mount and found the results, bad haha.
Is there any real world applicated of a TMD in a high frequency non stable application like a mountain bike? I mostly know of them being used in buildings. Maybe high end boats use them for stability?
FRIC does a different thing, prevents roll in corners and pitch changes under braking and accelerating but otherwise frees up the suspension corners over bumps. Inverters (and tuned mass dampers) oppose acceleration while dampers oppose velocity. FRIC just tunes how that is achieved. Springs oppose displacement obviously. And to have it stiff in heave they use third springs.
As for inerters on bikes, it was actually @Dave_Camp .
F1 Tech Rumors and Innovation
Specialized Chisel Full Suspension Just added to the Specialized USA site. I see Articles via google search that are not available to read yet. Guessing new product announcement this am?
https://www.specialized.com/us/en/chisel-comp-shimano/p/4274028?color=5…
Escape Collective has some photos of it from a trade show in Australia. Appears to be an alloy clone of the Epic. Thought the price might be a little lower.
It looks like they dropped the low end carbon models. The lowest price is 5000 now.
A little over 28 pounds for a medium frame seems pretty good though.
More info on the new Chisel here: https://www.vitalmtb.com/news/press-release/speed-metal-all-new-chisel.
Is it just me, or does an aluminum flex stay seem sketchy? I’m sure it’s designed to last fine for the typical 3-5 year ownership of a new frame, but it’s certainly not a bike I’d buy second hand given aluminum’s poor fatigue strength. It would be cool if you could swap the carbon rear triangle from an epic to extend the life of the bike instead of just having a cheap, disposable frame. As is, it seems like the soda can of MTB frames tho - light, cheap, and disposable.
Not sketchy at all I've been told. The relatively low Young's modulus of aluminium let's you get away with quite a bit of deflection on an aluminium structure without any major impacts on fatigue. Fatigue is apparently an incredibly easy problem to fix from a design perspective; just add a little more material and you're good.
Bikes these days undergo excessive testing, both through FEM and on a test bench. Modern bikes are designed to withstand hundreds of thousands of full load cycles and in reality, you'll never even get anywhere close to riding your bike that much.
I assume this frame was made by Merida, part owners of specialized - Merida have the alloy flex stay thing figured out, their One-Sixty models are tough as heck - rated for heavy bike park use with a lifetime warranty.
Speaking of ownership times, i've not had an alloy frame last more than a year until I got an alloy Merida.
It seems Canyon is experimenting the KIS Steering Stabilizer on the XCO/Marathon bikes as well. I noticed that small black plastic with a screw on the top of the top tube (Canyon Lux CFR), on Luca's bike and accidentally noticed something strange: that's must be a KIS!
Source: https://www.pinkbike.com/news/the-actual-weights-of-11-world-cup-xc-rac…
Thankfully someone else beat me to this.
I could add a lot more about how flex is inherent to any design, even if you don't "feel" it, and that aluminum can be made to work just fine depending on a myriad of factors.
But instead, I just wanted an excuse to post an OG flex stay alloy bike (that worked)
Do you have alu h-bars on your bike?
You'll be just fine