Wireless...

"Fly" by wire...

Discuss

Impractical with current technology. Needs more than one battery, vulnerable to interference (i.e can't shift when riding next to power lines), and more setup to pair the shifters to the deraileurs so they don't shift when the rider next to you shifts. A good system would also use some form of cryptographic authentication so someone with a rogue shifter connected to an antenna couldn't shift your bike for you when you are trying to sprint.

None of those things are impossible with current tech, its just that fixing them makes the system too heavy and complex compared to the other solutions out there.

When battery tech gets good enough that the extra batteries are lighter than the wiring in a wired system, then it could happen.

That's all we need is even more electromagnetic radiation being shot at us.

coded 2.4 gightz transmitters aren't that hard to make sparky. My Cateye V3 is 2.4ghz AND coded. It's just a signal. don't make it that freaking hard.

Maybe UMD or someone else can chime in here but aren't the 2.4ghz powertaps coded as well?

You act like this is rocket science. it's not. All it would take is some basic R&D and $ and I would bet there are people on this board that could make it work or take a stab at it.

The Dura Ace electric groupset would be a good place to start.

Dia Compe Friction downtube for the win.

Pcad?

none of the points Rutnick made address the "multiple batteries" issue.

More batteries = more weight, right?

I $5 that sez the big three already have wireless prototypes.

Have faith in technology
https://spluch.blogspot.com/2007/12/p...n-battery.html

when bikes can be made that are 2lbs under the UCI limit, who cares?

Ew Gross!

I'd worry more about the cell phone.

Well, the head unit battery could be made very small if it didn't have to run the derailleurs.

So that leaves two big batteries instead of one...

Is it totally wireless or just wireless to the derailers? How much freaking battery would be needed to transmit switch commands from the shifters to the derailers anyway? Look at a wireless bike computer, that wireless sensor is basically telling the head unit...yes...yes...yes....how many times in a minute? So pushing a button on a shifter isn't going to take up that much juice to transmit.

A watch battery in my V3 lasted for 1 year in my V3 and it was 2.4 ghz and coded. One each for the shifters. One for the derailers to pickup the command and another battery to shift.

wireless to the derailers just means the same battery as before with a battery to receive the codes from the shifters.

I'm currently working on developing shifting via telekinesis, but I've hit a mental roadblock.

The derailers still need a power source that can put out enough voltage(?) to move the chain.

yes and they would. Either two batteries (one to receive and one to shift) or one battery to do both.

You can put one battery on the right chainstay to shift the RD and one on the DT or actually integrated with the FD.

The battery pack for the RD wouldn't be any worse than the sensor for the Polar CS600 with power measurement.

Have you actually LOOKED at those?

are you AWARE of the battery Di2 is using?

This results in a 176 square cm battery. This does not Inlcude additional power for the radio components.

sounds like a fixie rider.

there are answers to these questions that do not require speculation

Needs this...

The Dérailleurs work as solenoids; which require current to effect a magnetic field. Being able to source Current is more important (as a battery for the shimano-Di2) for shifting than voltage (which is why they went with lithium).

Threads like this should be hermetically sealed and brought back once wireless electronic shifting is available on 105 for 600 bucks.

Doubting technology is a sure-fire way to eventually be wrong.

I wasn't speculating. basically, my wireless V3 cadence and speed sensor reads two inputs simultaneously, is coded, is 2.4 ghz and lasted 1 year. both are basically reading whether a switch is on or off. The same thing as a shifter. on...off...on...off... runs on one watch battery.

I guess we could throw a nice display to tell you what gear you are in since Pcad can't do it without an optical display of some type.

Nice paper....lots of words....you are hired.

PM me; I'll tell you where to send the check.