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How does the rider trigger the shifting? The interviewee refers to the system as "wireless", and I assumed that meant "no shifter cable" (as opposed to "using e
by schoen 7y ago
How does the rider trigger the shifting? The interviewee refers to the system as "wireless", and I assumed that meant "no shifter cable" (as opposed to "using electromagnetic energy for communication" or something). I can't quite see in the video what they're doing to cause the shift up or down to happen.
- jgalentine007 7y agoI thought I saw a serial cable port on the shaft - I'm guessing it's wireless and battery powered?
- smacktoward 7y agoOh good, I can’t wait until a Ukrainian teenager decides to shift my bike down eight gears in traffic for the lulz
- loeg 7y agoeTap baby. This tech has been around since 2015: https://en.wikipedia.org/wiki/Electronic_gear-shifting_system#Wireless_shifting https://en.wikipedia.org/wiki/Electronic_gear-shifting_syste...
- enz 7y agoThanks for the link, I have definitely learnt something. I didn’t suspect such system to exist outside a Sci-fi book!
- rdiddly 7y agoIn bikes these days, they do indeed mean "using EM energy for communication," AND also "no shifter cable." There's a comm link similar to Bluetooth (or maybe straight-up consisting of Bluetooth, I don't actually know) between the shifter controls and an actuated derailleur (or whatever the shifting mechanism is called in this case).
- loeg 7y agoProbably something lower power than BT. These things try to have days of battery life with tiny batteries (e.g., Di2, eTap).
- tinus_hn 7y agoModern Bluetooth can have years of battery life on a cr2032 button cell if all it does is signal some inputs.
- loeg 7y agoWhat kind of IC do you have in mind for that kind of lifetime? While signaling, say, twice a minute on average, 2 hours a day?
- tinus_hn 7y agoI have no idea how it’s built but I’ve seen it work in practice. This kind of device works for years on a small battery, signaling every rotation of your wheel to your phone as you cycle: https://s.click.aliexpress.com/e/Mv9PcDu8 https://s.click.aliexpress.com/e/Mv9PcDu8
- loeg 7y agoThe spec page says 500 hours of battery, which is about 20 days. At 2 hrs/day that's 240 days -- still quite a bit, but yeah.