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some bullshit. Cane Crik does not like pushing the envelope. I was hoping for 17x156.5 but whatever I guess. Ill just have to accept the flex.
It's gonna be steel too
In regard to front axles and stiffness of inverted forks, the angular deflection of a shaft is defined as θ=(T*L)/(J*G). The key variables for axles are J (polar moment of inertia since we're talking about circles) and G (shear modulus of the material). J for a circular cross section is J(r1,r2)=(π*((r1^4)-(r2^4)))/2 where r1 is the OD and r2 is the ID (zero if solid). As for G, the shear modulus of steel is approximately 3x that of aluminum. Now for a comparison between 15 and 20 mm axles... Lets say we have a solid 15 mm axle and want to know what wall thickness would result in an equal torsional rigidity out of a 20 mm axle with both being the same material. We then solve the equation J(7.5,0)=J(10,r) for r. That yields r=9.09 mm. So a 20 mm axle with a 0.91 mm wall thickness would have identical torsional rigidity to a solid 15 mm axle. That's a pretty thin. Thinner than what any 20 mm axle would have. Now if we were to do the same comparison using a 3 mm wall thickness on the 20 mm axle, the result is that the 20 mm axle is 2.4 times stiffer than the solid 15 mm axle. This is all assuming the pinch clamps don't slip of course, but if the goal is improved torsional rigidity of an inverted fork, a larger diameter axle is a clear choice.
Absolutely, 20mm axles are definitely the best option for stiffness, but they do put a barrier on adoption in the current bike market, and going with a 15mm steel axle, while not as light or as stiff, makes adoption a lot easier and lowers the barrier to entry. It's a problem the industry made themselves since 20mm axles have been around forever, but 15mm became the default for everything but DH bikes.
@CascadeComponents Would making the ends of the axle (that lock into the fork) square or some polygon, increase total system 'stiffness' or 'rigidity'? I think/know non-round axle ends have been tried, but why have they not been popular in these designs?
If adequate clamping can be achieved, the end shape of the axle end doesn’t make a difference. If you were to have a pinch clamp that couldn’t handle much torque, a non-circular end could be useful. Although in my mind that would be the time to revisit the pinch clamp design as well.
yet it makes no big difference on an intend. i ride my flash 38 with the 15mm option
You've tested both and settled on the 15 mm? Interested to know what hub you're using with it, too.
I ve got a hope front hub with the 2 different adaptators for 20*110 and 15*110 , you just have to take off the circlips , put the other adaptators and put on the circlips again.
Cornelius ( from Intend) tell me that there is no significant rigidity difference beween the two axle
and i believe Intend, i rode the 20mm on the Podium, 2.75kg fork, and my new Intend edge with a 15mm axle, none feel flexy at all under any circumstance, if something, the edge feels stiffer and smoother under braking and corners, while being 2.25kg, half a kg lighter or a pound in freedom unit
32'' seems like an overly elaborate plan to revive super boost :D
Either way, very interesting stuff by Newmen.
no, i rely on what the manufacturer says on this topic. besides, i rode the flash 35 on 15mm before and had not the impression it needs to be stiffer
hub is the current race face vault (turbine 2 wheels), can't be changed to 20mm
As far as I know, yes. But it might be the answer to the late bite point of the current brakes in their lineup. Who knows if they introduce it in the rest of the brakes
I’ll bet it’s somehow over the price of the Atherton. In which case why would you ever choose the Pivot?
Shiny new tech stored in the filing cabinet!
https://orangebikes.com/pages/phase-avinox-model
(Still love my Stage 6, regardless of what the internetz tell me about it 😄)
Really missed the opportunity for an orange Fox fork to make the Orange orange-r.
But we all have a suspicion that 148 will be deemed too narrow and 157 is too wide, thus big hub will create new boost ultra 152.5 or some nonsense.
Two words:
https://youtube.com/shorts/Igh0tNE_s74?si=RBh7OYUVacH_sUSu
Will be adaptable I heard, 15x110 and 20x110.
Zeb's and the SRAM stuff out on Tuesday.
Any ideas what the “SRAM stuff” is? I’m joining the announcement presentation, but don’t remember seeing any SRAM-specific rumors here after the recent Maven updates.
Updated Zeb, Lyrik, Vivid air, what else?
Yeah but that’s all RockShox. The announcement says:
“Please join us on February 24th at 9AM CST to learn about the newest SRAM and RockShox products”
Heard maybe some drive train updates. Perhaps a stronger clutch and sprocket with fewer cogs for emtb?
Shot in the dark... Mechanical DH transmission? Why wait on it?
ill be able to contain myself for a week
Interesting details, they offer XD and XD slim, HG and HG slim both in 148 and 157 widths. I presume this means at least one new hub shell with wider hub flanges for 157, maybe 148 is just using a standard 157 hub shell with a short driver body? Either way it's a cool move for DH bikes and I hope we get the option to buy the hubs and the rims aftermarket.
Regarding new SRAM and Rockshox stuff: there will also be a new Super Deluxe Air, and most likely an Ochain announcement.
@sethimus @Evil96 @CascadeComponents
I love, like love-love, that someone with an engineering background (and seemingly a degree) and a wealth of manufacturing experience provided factual mathematical evidence, and it has been refuted by "I believe the manufacturer of this shiny new thing I bought", like conformation bias doesnt exist or something....
There's a quote about facts and opinions that I'm trying to remember here......
it'll come to me....
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