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PWM, pulse width modulation, is a digital signal. It’s binary that varies in time(width).
Jesus are those prices in USD?
Specialized dropping a highly anticipated elite level S-Works product, and you’re surprised…?
yeah, fair. So, not in the new Demo then. SRAM will likely have some new ochain thing eventually, but, they didn't limit spec to it.
They ain't seen nothing yet.
They’ve lost their minds…
Can you please not drag your abrasive views on world situation into every damn topic? We're talking about bikes not world politics.
As for the new Demo and Sram drivetrain thingamajiggy, will it be available for other brands besides Specialized too? Does it circumvent DWs twochainz patent?
The mention of 24t and 26t remember me the truvativ Hammerschmidt. maybe a two speed gearbox
Maybe oval chainring - normally you have the crank in a certain position when pedalkickback occurs (--> horizontal) - so it might make sense to tweak this position specifically.
It makes little sense to have an oval chainring to sliiightly alter pedal kickback behaviour at the expense of everything else. Plus a 2t ovalness would hardly change the kickback situation.
What I'm expecting here is that the internal chain drive also has a gear ratio applied to it. That way you can have a smaller output ring physically but have the final drive of a larger one. In numbers, a 24t ring k the cranks and a 20t on the output side gives a 1,2 gear ratio which means a 30t chainring on the output would behave the same as having a 36t ring straight on the cranks. All of this also applies on the pedal kickback front, where a larger ring means less kickback. Plus with this setup ground clearance is not an issue.
BTW, the right image on Sram's site shows two small chainrings and one large (output) ring. I'm betting they are using two chains to go from the crank to the output shaft to circumvent the DW patent. I took a quick glance at it and it shows only one chain going to the secondary shaft and I think it also says that.
I think the 24 and 26t is in reference to the final drive gear.. I recall one of the Sea Otter pics of the prototype having 24 written on the front cog..
I think DW's patent excludes setups with the cogs concentric to a pivot, or if there is a shaft through the frame connecting them, which is the case for the demo.
Whether or not it's an inventive step and should have been patented is another discussion.
Very interesting to see that the new Demo run's 3 chains. The Highgear setup looks interesting.
The service guide is online if anyone wants to take a look
Care to link to it? I can't find it.
How about a link, gumshoe?
Curious to see how much / little has changed since the patent drawings.
S-Works Demo 11 Frameset
Its listed in the Manual downloads at the bottom of the page.
Im not tech enough to add the file here
Another wild thing about this Demo is that it uses a GXP spindle for its crankset. We're almost back to isis bbs haha.
And it seems to me that you aren't locked into running sram drivetrains, just the special crankset and Chainrings, but you can run anything else on the back of the bike.
Alright, as you guys know Im a little bit of a tard. Can someone explain why the hell this bike has like 4 chain rings? At the end of the day the suspension compresses and it rolls down hill. So why go through so much when the team would probably still win just as much on the old Demo? This bike truly gives me Halo Car production feeling. I think thats what Specialized is hoping for. Then to have a trickle down effect when everyone buys the other models.
https://media.specialized.com/support/collateral/HIGHGEAR_SERVICE_AND_MAINTENANCE_GUIDE_ENGLISH.pdf
https://media.specialized.com/support/collateral/DEMO_11_USER_MANUAL_ENGLISH.pdf
It's likely for more consistent kinematics, namely antisquat. Someone mentioned it in the sea otter thread. By using this set up, you can change the effective gear ratio by modifying the size of the internal cogs, without changing the chains path and therefore anti squat of the bike.
It's like having a high pivot, but not as high. High high pivots have some negatives with them.
Then when you have a high pivot, with this solution you have good chain wrap.
As for four chainrings, it actually has six - two on the crank spindle, three on the second spindle (two to connect to the crank spindle and one to drive the rear wheel) and one to guide the chain over the crank spindle (because there's some overlap). You could ditch the last one if you moved the secondary spindle higher up, but as I said above it's running two chains in the box probably to get around Dave weagles patent.
Proprietary cranks that only go down to 160mm
Wow… I think doing maintenance on this will be worse than Scotts.
Thank you for the clarification and explanation.
saw the manual, have fun maintaining the demo 11 😅 but bike looks fire and pretty cool concept, same goes for the pivot phoenix‘s suspension/drivetrain.
To be fair, the last demo had a ridiculous amount of bearings in it, but I managed to ride one for two seasons and never needed to maintain it at all. Hopefully, this bike will be the same level of quality.
I want to see Shimano release something developed from their 2019 internal "gearbox" patent. It had an even higher output shaft position and would make high-pivots easier to pull off without an idlers.
Definitely needs a mud guard.
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