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Tomorrow's Bicycle Drive?
On Monday, June 10, 2019 at 5:55:45 PM UTC-7, John B. wrote:
On Mon, 10 Jun 2019 18:02:05 -0500, AMuzi wrote: On 6/10/2019 2:52 PM, Sir Ridesalot wrote: On Monday, June 10, 2019 at 1:33:08 PM UTC-4, Tom Kunich wrote: On Friday, June 7, 2019 at 10:01:07 PM UTC-7, John B. Slocomb wrote: On Fri, 7 Jun 2019 11:09:59 -0700 (PDT), Tom Kunich wrote: On Thursday, June 6, 2019 at 4:31:13 PM UTC-7, John B. wrote: On Thu, 6 Jun 2019 13:15:10 -0700 (PDT), Tom Kunich wrote: On Thursday, June 6, 2019 at 9:11:17 AM UTC-7, Sir Ridesalot wrote: On Sunday, June 2, 2019 at 5:49:03 AM UTC-4, John B. Slocomb wrote: See https://www.youtube.com/watch?v=-9gQ1KRhesM In the narration he mentions that a 24 speed gear set, or even more, would be perfectly feasible. No wires, no cables, either. -- Cheers, John B. I can just imaging what road grit when it rains will do to those exposed bearings and interface. Can we say RAPID wear? Cheers What exposed bearings? They are sealed ceramic bearings. But again, the frame must be custom built for it. So there's no way it would ever make it on the market. Custom Frame? You mean like a MTB with fore and aft suspension? That will never make it on the market? -- cheers, John B. There is a very strong purpose for full suspension in racing and people tend to copy racers. But ravers won't use drive shafts because they are inherently very lossy. Hydraulic brakes and electronic shifting are there just to increase the cost of a bike. But the article about this "NEW" shaft drive system says that it is 1% more efficient than a chain drive. You don't think that "racers" will want a carbon fiber bike that will likely be as light as legal and 1% more efficient? -- Cheers, John B. Any testing they did must have been unloaded. You can make a lot of things look quite efficient without a load on it. IIRC the 98% efficiency of a derailleur system is reached ONLY when the gear is equal to a one to one ratio. I might be wrong about that but my understanding is that that 98% efficiency is ONLY reached with ONE particular gear. Other gears are less efficient. With the driveshaft system shown upthread I can't but wonder how it'd wear and how soon the interface of the gears would get sloppy. Plus as was also mentioned upthread, with that driveshaft it might not be too easy to do an emergency wheel swap. Cheers Yes, there's that. For bevel gears the stated '90~95%' is per set and you need two so likely closer to 80%. According to the Ceramicspeed site they tested the DrivEN system and it is 99% efficient. The entire system. -- cheers, John B. John, I'm sure it is unloaded and clean. |
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