Why are they using roller bearings? Just copy the ways gears are designed in car transmissions. More teeth with a tighter fit. Now they might mean encasing the thing so it can be filled with lubricant, but I'm sure it can be done similar to the way direct drive motocycles do it.
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phanto (Short Spike)
^ As he said.
It already exists, it's called a transmission. Make it lighter with lower drag as it doesn't need to withstand the torque and speeds of an ordinary car transmission and voilà. What they have there is just a flimsier version of that.
That looks like investor bait to me.
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Fullauto223cal (Old Spike)
Flimsy, you're right on the money there.
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ilovecookies (Short Spike)
I think space and weight is the issue on bikes, for racing at least which I think this is geared toward given the use of carbon fiber. https://www.youtube.com/watch?v=kVPjhmTThPo <-- is a "CVP" system similar to a CVT all packaged in a rear hub that sits inside the rear wheel. the catch is that it's 2500g over 5lbs! (https://www.amazon.com/NuVinci-N360-rear-hole-black/dp/B003RLA3KG/ref=cm_cr_arp_d_product_top?ie=UTF8). A pro racing bike will be around 600g for the rear hub, cassette, and derailluer. That being said, I'm pretty skeptical of this thing too... it needs a controller to determine the position of the cassette in order to time the shift through the few shift lanes sounds like a disaster waiting to happen.
Comments
(Old Spike)
Why are they using roller bearings? Just copy the ways gears are designed in car transmissions. More teeth with a tighter fit. Now they might mean encasing the thing so it can be filled with lubricant, but I'm sure it can be done similar to the way direct drive motocycles do it.
(Short Spike)
^ As he said.
It already exists, it's called a transmission. Make it lighter with lower drag as it doesn't need to withstand the torque and speeds of an ordinary car transmission and voilà. What they have there is just a flimsier version of that.
That looks like investor bait to me.
(Old Spike)
Flimsy, you're right on the money there.
(Short Spike)
I think space and weight is the issue on bikes, for racing at least which I think this is geared toward given the use of carbon fiber. https://www.youtube.com/watch?v=kVPjhmTThPo <-- is a "CVP" system similar to a CVT all packaged in a rear hub that sits inside the rear wheel. the catch is that it's 2500g over 5lbs! (https://www.amazon.com/NuVinci-N360-rear-hole-black/dp/B003RLA3KG/ref=cm_cr_arp_d_product_top?ie=UTF8). A pro racing bike will be around 600g for the rear hub, cassette, and derailluer. That being said, I'm pretty skeptical of this thing too... it needs a controller to determine the position of the cassette in order to time the shift through the few shift lanes sounds like a disaster waiting to happen.