Gearing can be quiet, take the example of car gearboxes, OK a straight cut gearbox whines like hell, but the more normal ones dont, ditto bevle gears, no reason they cant be cut to quieten them down.
Has no one thought of regenerattive braking yet? Squeeze the rear brake and that big chubb hub or powertap could easily be concealing an alternator?
I reckon this is awesome, not sure what the legal aspects of it on an MTB would be though, would it not turn us into motorbikes?
Can the gearing be quiet though?
Helicals and decent grease would cut most of that noise. It's possible. The diagram may (amazingly) be only indicative. But much like kers - you only need to use it at a critical point for a few seconds and you've destroyed the opponent.
why not make the motor concentric with the bb axle to get rid of the bevel gear?
You would then have to put it inside the bottom bracket axle, and then you wouldn't be able to transfer the torque to the frame, so the motor would just spin itself. It would also be very tricky to get the electrickery to it too.
I reckon this is awesome, not sure what the legal aspects of it on an MTB would be though, would it not turn us into motorbikes?
In the UK as long as it won't power the bike above 15mph it's counted as an electric bike.
It would of course be very illegal for competition!
I didn't say it wouldn't work, only that, compared to the power of an athlete, it wouldn't be much!
They're likely averaging somewhere around 250-300W over a 5 hour race, with some intense efforts of substantially more, it wouldn't need to be much. On the other hand, it's a load of twaddle.
If used "correctly" the noise wouldn't be much of a issue: the riders would be surrounded by thousands of screaming fans, multiple team cars, police and camera motorcycles, and possibly a couple of helicopters in the sky.
And doesn't need to operate at 100W over four hours. It only really needs to deliver enough power for the rider to pedal at one or two gears higher for a few minutes to make a huge difference in a lot of races. Like others have said, that's the kind of technology that would be easily found in consumer power tools.
I've seen it reported somewhere and it did offer a constant output, giving the rider fresher legs when they attacked after 5 hours riding. Still think it's total rubbish though!
Have to admit, there's an element of the Italian cycling community looking for anything to distract from the fact that every notable Italian cyclist of late seems to be juiced up. But damn, it seems like a plausible idea right enough, whether anyone in the peleton would have the balls to use it...I dunno.
i imagine the sound of the peloton and the air past their ears would drown out most electrical / gearing noises.
All seems a bit silly though.
Interesting
denied by cancellera here
http://www.velonation.com/News/ID/4387/Cancellara-denies-bike-motor-story-others-debate-the-issue.aspx
I would suggest it is too much of a risk for him to do something like this..
rootes1 - why not make the motor concentric with the bb axle to get rid of the bevel gear?
paulrockliffe - You would then have to put it inside the bottom bracket axle, and then you wouldn't be able to transfer the torque to the frame, so the motor would just spin itself. It would also be very tricky to get the electrickery to it too.
erm - put it outside of the axle!! i.e. make the axle the armature and the BB shell the static part... i.e the just like all the power assist hubs but keep outer static and let the centre spin.. though revs/ratio of motor to cadence might be an issue... and might need a bigger BB shell
"For an added conspiracy theory, looks like Cervelo are working on a 650g road frame".
Yes they are and its called the R5ca and it did a stage on the Tour of California and by all accounts you'll need to rob a bank to buy it....
http://www.cervelo.com/en_us/engineering/project-california/
RE Cancellera how did he do in the Giro?
how is this in any way 'doping'? These roadies just can't stop thinking about doping!
I would love one though, if you could charge it with regenerative braking
Cancellera didn't do the giro....
Cancellera didn't do the giro....
...yeah, he's having a rest after the classics to recharge his batteries before the Tour....
<sorry.... IGMC....>
That is why I asked the question 
I bet Cancelleras lawyers are peeing themselves with excitement at the prospect of the liable suits...
Well I have seen it this morning in the sport pages of the local rag...
Debunking:
http://www.velonation.com/News/ID/4415/Fabian-Cancellaras-so-called-motorized-doping-debunked.aspx
New Roubaix images released.
LOL!
I'd build it into the down tube and charge it through the bottle cage allen bolts - just to confound the UCI chappie with his allen key and torch
Regenerative braking on a bike would not be worth the extra weight, complications, and resistance (due to back emf) for the amount energy saved.
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