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Bike industry has planned obsolescence and early life failure down to a tee though! Saw a video of the Levo SL, open up the charge plug and there is water in there...
https://cyclingtips.com/2020/07/this-rear-hub-has-2x-wireless-shifting-…
I'll write a bit more about this in the afternoon, I already did some quick calculations in Excel yesterday.
https://www.bikeexchange.com.au/s/dual-suspension-mountain-bikes/trek?s…
I would love a new, lighter Hammerschmidt that you could pair with the e*13 DH cassette and an even smaller derailleur....
Not technically new technology but here’s another brand selling the Mullet setup straight from the factory. Seems like it’s almost part for part the same bike that wyn and Martin are racing on
The planetary gearbox ratio was determined by trial and error, same goes for the cassette (smaller cogs emant weird jumps between gears in at least one part of the cassette) and it gives a very smooth drivetrain jumps wise with a minimal jump of 14 % (only one under 15 %, going from 30,7 to 35 'cog'), max jump of 18,6 % and an average jump of 17 %.
Pic (jump 1 is 10 to '11,8' or 10 underdriven):
I've added the current crop of Sram Eagle systems (shows how utterly stupid the 52T cassette is) and Shimanos' 10-51 cassette. This combo geartrain is more constant throughout the range than both and gives more range than both as well.
How to achieve that? You start in the 10T cog and in 1:1 mode on the planetary. Pressing the shifter to choose 1 gear lighter switches the internal hub. Pressing it again switches BOTH the internal hub and the chain on the cassette.
Minuses? The jumps on the cassette are very big, it might be hard to get reliable shifting with the current state of affairs, shift ramps in the style of front shifting might be needed. And I don't see this happening without electronic shifting as you simultaneously shift two different systems. And the timing of the shifts might be an issue. It maybe could be possible with a twin indexing system in the trigger shifter by using two cables, but yeah, this is a challenge.
The benefits? Narrower cassette, narrower hubs and/or wider flange spacing on the hubs. That's the main thing and I don't think it'd be worth it unless either Sram or Shimano went that route for total integration. As to why? Well if you have a system that shifts smoothly under full load, you want to use it all the time. It doesn't make sense to me to use with a DH cassette or as a Hammerschmidt, because those are cassette double-uppers, where, once you reach one end of it, you have to move across the WHOLE cassette (and shift the fast and smooth mechanism only once) in order to get to the 'next gear'. And we all know how well that turns out. So why not use it all the time? I agree, using small DH like clusters seems nice (weight wise, production cost wise, shifting performance wise), but the negative, in my opinion, is just too great. You're effectively back to 2x gears of yore. And nobody likes those too much, the simplicity of 1x systems is just awesome.
It would work very well with the current crop of idler bikes though, there would be no antisquat changes there.
[url=https://www.youtube.com/watch?v=F7vJcvhwkf8][/url]