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Comment by jacquesm

4 years ago

This is a pedal assist e-bike. There are people that cheat and that install throttles so they can move without pedaling but that's a great way to get your vehicle confiscated.

A typical ride has me providing 40 to 60% of the Joules and the remainder comes out of the battery. If there is a very heavy wind up (not rare here) that might drop to 30/70 and if I have a tailwind it is the reverse. The bike has a nice stats display where it tracks all this stuff. Maximum assist is 350W (10A current out of a nominally 36V battery), at the wheel considerably less than that, this is only used when starting up from a complete stop. The rest of the time you're at a small fraction of that.

> There are people that cheat and that install throttles so they can move without pedaling but that's a great way to get your vehicle confiscated.

Note that this varies from jurisdiction to jurisdiction. In the US e-bikes with throttles are legally classified as Class 2 electric bicycles and are generally legal for use in bicycle infrastructure as long as they don't exceed 20 MPH.

FYI, the US classes are as follows: (1) 20 MPH (32 km/h) max, pedal-assist; (2) 20 MPH max, throttle; (3) 28 MPH (45 km/h) max, pedal-assist.

  • I'm not in the US.

    • I don't think you need to defend yourself so vigorously in this thread. But I would say that what you're seeing is distinctly the American experience with e-bikes and bike enforcement.

      Americans are generally clueless about e-bike laws. This includes police and e-bike owners. American e-bikes are marketed as having throttles, being to bypass traffic at high speeds using the bike lanes and bike paths, and not needing licensing/registration. As an analog cyclist, my experience is that e-bikers jump the lines at red lights, sometimes shoving you out of the way. With the bulk of my cargo bike, they sometimes instead jump around me on the sidewalk instead, which is kind of funny-terrifying to watch with their heavy bikes. On bike paths, e-bikes stand out for their high speed in crowds and you wonder if the "assist" from the motor is a binary on/off.

      If all bikes were given more room and more consideration from drivers, this may not even be a real problem as each type would be able to spread out. But the infrastructure is pretty poor and police enforcement against drivers is even worse. So all the "alt transportation" people need to cram together in whatever meager space was won at the last road reconstruction meeting. E-bikes look great for converting drivers to bikes so no one wants to talk about banning them. But they also end up keeping their car driver mentality of me-first and objectifying everything else on the road around them.

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My wife just bought an ebike (from RadPower) that has both pedal assist and a throttle that doesn't require pedaling. You can also adjust the amount of pedal assist so you can "feather pedal".

Who's going to confiscate this bike????

  • > Who's going to confiscate this bike????

    Most european cops if they catch you: some countries may treat s-pedelecs as bikes, but in most it's a moped, you need a driving license, insurance, a license plate, and all the legal equipment of a moped (e.g. lights, rear view mirror), and commonly type approval (which is going to be very, very expensive). Also can't use cycle paths.

    Over the last few years many (but probably not all) member countries have passed laws to treat devices not exceeding 25km/h to bikes, but that's only for hard-limited devices, not "I swear I don't go faster than 25", the latter? mopeds.

    • On the day that daylight saving time changes so it's dark an hour early, the Dutch police sneak out all around the city, hide behind bushes, and jump out to surprise unsuspecting bike riders who don't have their lights on yet, and write them traffic tickets.

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    • > it's a moped, you need a driving license, insurance, a license plate, and all the legal equipment of a moped (e.g. lights, rear view mirror), and commonly type approval (which is going to be very, very expensive).

      The amount of bureaucracy in Europe for completely mundane things is completely unbelievable.

      Getting a Driver's license in France, for example, is an uphill battle against a very hostile administration. I can completely see why some tried to dodge some of these absurd regulations by innovating in the e-bike space.

      Having a tiny bike barely able to break the 25mph limit be considered a moped just because it has a throttle as well as pedal assist is completely ridiculous.

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  • Depends on your country, really. Throttle ebikes are legal in the USA so long as they don't go faster than 20MPH on throttle alone.

    And really speed is what matters here. Who cares if it's pedal-assist or throttle so long as you aren't going markedly faster than normal people without any motor at all? There's no safety concern.

    • At a certain point, you've added enough extra mass to the vehicle in terms of batteries, motor, beefed up brakes and frame, etc that you need to start asking questions about how much kinetic energy it's carrying and what happens to it all in case of a crash.

      Silly comparison, but we wouldn't let a car drive on the sidewalk even if it had a special module that limited it to 5km/h.

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  • It depends where you are. Most EU countries forbid throttles, but they're ok in the US as long as your under 1000W motor output (Federal laws), but local laws can make this stricter.

    I've built several e-bikes, for fun, and like the author of this article, I've got a long range one, but only with about half of his battery capacity, which is enough for me.

Looking at those power numbers, I can't help but wonder how much you'd gain by doing this sort of modification on a bike that is more efficient and/or aerodynamic even without the motor attached.

A touring bike frame with 700c wheels and a more stretched out position would likely allow you to travel at the same speed for lower total power output - and make your battery go further (or not require such a large battery).

But why does anyone actually care if you technically need to be pedaling in order for the electric motor to engage? Surely an electric bicycle could still go arbitrarily fast while arbitrarily requiring the pedals to turn. Isn't this whole thing just a silly loophole in what is considered a "bicycle"? What if instead, bicycle lanes just had rules regarding top speed, weight, form factor, etc.

> This is a pedal assist e-bike. There are people that cheat and that install throttles so they can move without pedaling but that's a great way to get your vehicle confiscated.

I really need to understand what's the difference with a throttle and a pedal assist whose curve is basically so that it gives all power at a ridiculously low pedaling rate...

I object to the pejorative "cheat" as to suggest that non pedal assist is morally worse than pedalling.

Edit to say nice job on the project, this is awesome. Here in Texas, I would love to see a lot of people using these in the bike lane.