A Smart Electric Bike: Taking the Copenhagen Wheel Out For a Spin
New submitter mlamonica writes Bikes are a great way to get around the city. But what if it's just too hilly or far to commute by bike? That's where Superpedestrian wants to come in. With a license from MIT's Senseable City Lab, they're commercializing the Copenhagen Wheel, a bike wheel replacement that gives riders electric assist, and through 12 embedded sensors, lots of information on a smart phone app. I took the bike for a ride at the Cambridge office and offer this review.
I can buy a kit on eBay for $250.
I don't see the point of all this electronics or intelligence in a bicycle. If anything, the location tracking means that bicycles now also are starting to invade my privacy.
For regular distances, a purely mechanical bike is simple, robust, and inexpensive. For longer distances, vehicles designed from the ground up for motor assist seem a better choice than this, and the additional design freedom from designing bike and assist together likely results in a better and cheaper bike.
I'm not sure the wheel is the best place for the battery! TFA says the wheel weighs 13 lbs, which is a ton, and it's rotating mass. I'd rather have a hub motor but have a small battery pack affixed elsewhere, maybe in a bottle cage, where it doesn't have to rotate.
Also the topping out at 20 MPH is a little low. It would surely be useful in conditions of headwinds or uphills, where you cannot ride very fast, so that's nice. But for normal cruising, 20 MPH can be sustained by a fit rider who isn't elderly. I can just do it on flat ground with no winds, and I'm 52. Younger riders have no problems at all. I understand it's a regulatory issue but it would be nice if the top speed could be upped just a little, maybe to 25 mph. It's far harder to ride 25 mph on a bike - I cannot do it for more than a minute unless assisted by hills or wind. Power demand is not linear with speed. It would be nice to have that power difference made up by a motor.
here in Boston, where I live
Narrow twisty roads, and when the snowbank gets high, narrower roads
non highway routes are often circuitous
Dark at 5PM much of the year (and add in the snowy, narrow twisty roads...)
Potholes
Did I mention potholes ?
Rain snow sleet
weather down to teens to single digits many days of the year
lack of decent bike racks (some day, some smart person will write a n y times op ed about how bad bike racks are)
no showers, or cruddy showers
not so good when you have to go pick up your kid at school, or dance recital, or...
maybe inside Cambridge or Boston itself, a bike might work
For much of MA, no so good
the problem is NOT that we need easier to use bikes
the problem is that we have a car suburban orientation; change tax laws and zoning so people are packed into citys, and bikes will take care of themselves
First, don't think of the copenhagen wheel as an electric bike. Think of it as a wheel - that can be used to retrofit nearly any compatible bike. It's wireless capabilities means that you don't even need a controller on the bike wired to it.
As for the weight, it's at least around the axle, not the rim, so that reduces the effects. One can certainly argue about the max speed, but keep in mind that the non-linear power increases would also rapidly increase the cost and weight of the batteries and motor.
I don't read AC A human right
Lestor Holt was waiting for the reporter with his back to the camera, hunched over, to finish taking a leak ... the reporter says, "what? now?" as he eventually turns around while zipping up, and puts on his gloves.
Hilarious, Lestor!
they are not multi-taskers. one person/one way/ ok. any more than that is a fail. electric-assist will not get my dog to the vet, or other multi-passenger duties. bike lanes or other gov-assisted options spend $/time on the 1% who bike.
There is a limit on how many CC a gasoline powered bicycle's engine can be just because of random laws in the USA. If you look to China, a great deal of people get around cheaply on a bicycle with gasoline powered engines. But we can't, because we have laws. Now if you turn your bicycle electric, it will be heavier, more inefficient, but there are no ways of measuring how many CC an electric motor has ^^. Voila, sneak around the laws, and maybe you have a market for this.
God spoke to me
I am not sure who in their sane mind, writes such a poorly paced 2 page article.
I am sure its up to journalistic standards, but please, learn how to cut it down. Its far too long for something thats essentially "This is a thing, this is the company, and this is how it works, and this was my experience with this thing". Especially when you forget to talk about the third and fourth point.
The problem with bikes is weather.
We are getting into (the northern hemisphere) winter. Snow and ice on the roads make cycling too dangerous, and then theres the wind chill...
I've been there and indeed you do see bikes everywhere. I did not see a single electric bike though. When I asked around, I've heard that bikes get stolen all the time so it is not worth putting too much money into them.
I hope this is a massive typo, considering that my car weights just over 1 ton.
I thought he meant it as a figure of speech. Saying "that's a ton" is used to mean "that's a lot", not that it's literally exactly one ton.
Do you know that wheel mass has no effect except if you accelerate?
Once you step outside the simplified world of physics 101, it does matter at least a little. It's why cyclists are always pushing for lighter wheels. In a pure "frictionless massless sphere" sense, maybe it doesn't matter except when accelerating. But this is the real world. Other effects come into the picture. If you have suspension, it matters even more, because the wheel is unsprung weight. Much better to have the weight on the frame.
Please, don't contradict yourself in two sentences. I only 62 year olds that tide faster than you for hours at a time. 52 is not "elderly".
He didn't contradict himself. He didn't claim he was elderly. He said 20 can be sustained if you are not elderly, followed by saying he was able to do it, and since as you say he is not elderly, there's no contradiction.
Just FYI, not many people sustain 40km/h on their road bikes in their Lycra shorts.
.... which is probably why he wants the motor to assist at that speed, since most people cannot do it on their own.
TFA says the wheel weighs 13 lbs, which is a ton,
wrong. I hope this is a massive typo, considering that my car weights just over 1 ton.
*sigh* I guess figurative speech is going the way of the dodo...
“He’s not deformed, he’s just drunk!”
This looks very similar to the bionx system that has excited for several years, except it's using your smartphone instead of a dedicated display unit
http://ridebionx.com/products/...
There is a number of smaller companies out there as well making similar conversion kits (or even pre-built systems).
In many jurisdictions it is ILLEGAL for a power-assisted bicycles to exceed 30km/h. If something goes faster and is power-assisted, it is no longer considered a bicycle (or power assisted bicycle), but a motorcycle (or scooter or whatever), and different laws and licensing requirements govern said vehicle.
Exactly. In the United States, the speed limit is 20mph. What you buy is often capable of more than that as a top speed (to deal with steep hills,etc) but the speed is artificially limited
There is also different sub-categories which can vary considerably depending on state
e.g.
"Electric-assist" bicycle (where the user still needs to pedal to some extent keep accelerating)
"Motorized bicycle" where it can be self-propelled (controlled by throttle) after a the user used the pedals from a stop
"Motor-Driven cycle" can be self-propelled from a start, and often allows a higher top-speed but must be smaller than a motorcycle. Per State, may or may not require a full motorcycle license and/or follow motorcycle safety regulations.
See Wikipedia for more
http://en.wikipedia.org/wiki/E...
The battery doesn't rotate, neither do the electronics, nor the stator. They are essentially fixed to the frame, only the wheel, the spokes and rotor rotate... The mass as the back is really no different than when people have rear bags. There an EN standard that has been adopted almost everywhere (except the USA - kind of like the metric system!) which is that pedal assist bikes should go a maximum of 25km/hr.
The problem with those kits is that they are not illegal. In most places on earth 200W is the limit, or 250W with pedal assist. Essentially no kit is really pedal assist. The whole point of this wheel is that its street legal and pedal assist, and all in one so you can swap between bikes quickly and easily. It also has a compeditor in flykly.com which was on kickstart, both are trying to ship ASAP and beat each other.
Good thing they are not selling only to boston then.
A lot of them have been done before. However they are all front wheel, with no pedal assist, and have external batteries. Its interesting that there is a lot of mocking of the wheel on slashdot. Both copenhagen wheel and flykly have pre-sold over $1 million dollars worth each, and copenhagen has at least another $4 million in funders who are expecting a large profit. E-bike sales are over 3 million per year, normal bike says are at 100 million per year. So 97% of people with bikes don't have e-bikes. One they start mass producing these wheels could come down to $299 or less. I think eventually they will be standard on most bikes.
I wonder how large the market is for a kit like this. Really tech savvy people and those looking for a practical commuting option would probably veer towards other kits. Most bikes can be converted to use an electric hub motor pretty simply now, and many countries do not have a 250 watt limit. Here in Canada the limit is 500 watts and it would be hard to convince me to run a setup with half the range and half the power of what I'm currently using.
I do see value in the self contained unit though, as it would be attractive to those who don't feel capable of installing their own setup or those who are impressed by the ever so trendy data logging features. I just wonder if there are enough customers who are lazy enough to buy this wheel instead of a more versatile setup, but not lazy enough to buy a purpose built ebike. It's an interesting kit to be sure but I think it will need to win on simplicity, power, and range before it's "smart" features are going to convince any customers.
The author did not add much if anything to what is already known about the prototype. A more interesting article would have included some discussion about the way that Superpedestrian reneged on its promise to deliver the Copenhagen Wheel to early adopters like me who pre-ordered it last Christmas. Initial deliveries were supposed to take place in the spring but apparently somebody decided that they should ramp up (and manufacture overseas?) a larger quantity, delaying deliveries until sometime "before the end of 2014." Since May 1st, there has been no communication from Superpedestrian about when actual delivery will occur and pretty much the back of its hand with respect to those of us who paid $750.00 hoping to be a little more involved with the rollout. The author might also have spent some time talking to the bike dealers who want to sell (and service) the Copenhagen Wheel but who have been told by Superpedestrian that it can handle sales and service without any middlemen.
What if sensors get damaged and you get a burst of speed while trying to stop from hitting something, or when going downhill, instead of up?
My several year old e-bike has a hub motor. It's on the front wheel rather than the rear (because that makes the mechanicals simpler), but this is all off-the-shelf stuff nowadays.
Only in the EU. Hilarious. I bet the torque is limited too so if you weigh too much it writes you a ticket.
Worthy of note is that the majority of the mass in the wheel is NOT rotating. The batteries, sensors wiring and structure is in the stator, e.g stationary. The rotor consists of the red hub, some sort of magnet ring and while heavier than a normal wheel it would not be by much. The other 9 or 10lb will behave exactly like some weight on a rear rack.
I ride 11 miles of hills on a daily basis, year round, on my ebike. Mine is much more of a lightweight motorcycle with pedals with a 27lb hub motor and 1.8kwh of lipo. Substantially faster than a 50cc scooter and an order of magnitude more energy efficient.
.. But a butt ugly wheel hub. I can't see what's so special about it.. other hubs integrate with smartphones too, these days. Same as the Copenhagen wheel, all of the others also deliver more power on uphill runs (at least all of the newer ones). Many offer regen braking, and make a nice substitute for calipers in the rain. And they're not garish red either. Sorry. Not impressed. The concept is great though. I ride an electric myself, but don't bother with the "assist" feature. Too old ;-)
not worth anything more then 50$ because this is the price i've been paying for this in china for over a decade