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  1. daniel June 24, 2011 at 1:50 pm -  Reply

    niiice… this design is really effective.

  2. daniel June 24, 2011 at 2:10 pm -  Reply

    but… motor specifications, battery? images?

    • James Thomas June 24, 2011 at 2:16 pm -  Reply

      It will use a small (750 cm3) cylindrical battery, but Vojtech did not mention the supplier. Perhaps he can comment with further information about the battery and motor that he used as a basis for the design.

  3. Thomas G June 24, 2011 at 5:06 pm -  Reply


  4. epicyclo June 24, 2011 at 6:13 pm -  Reply

    It’s not often you see a student project for a bike which makes you think, “Mmmm, I’d like that”

    Last one was the Strida…

  5. Vojtech Sojka June 25, 2011 at 4:19 am -  Reply

    Hi guys, thank you for your comments. Let me answer your questions:
    First – the fenders and rack are of course logical question – It would be probably quite expensive to produce bright new accesories compared to the number of sold e bikes. if the bike was produced, Superior would (at this time) choose these accessories from their current offer of from some of their suppliers. I can imagine something really simple and cheap like Bender Fender. So as always, it is primarily the question of money and I wanted to keep the reasonable price

  6. Vojtech Sojka June 25, 2011 at 5:03 am -  Reply

    The second question – motor and batteries. Batteries are ussually produced by copmanies like Sanyo, Panasonic and others. The batteries are composed from smaller cells like classic AA battery. In the final shape you can bend them to each others, so you can get varied shapes. Suppliers can produce battery in certain shape, but this production must have reasonable quantity of sold pieces. I rather counted with smaller possibilty of creating special shape, so declared 750 cm3 are for straight cylinder shape, which would be easy to produce. In the case, the cylinder was a little bit bent (similar to the shape of down tube), the battery volume could be bigger – more than 1100cm3.

    And the last one – motor. The maximal power is 250W, according to the EU laws. Motor propels the bottom bracket of cranks, similar like Grubber assist, only the powertrain is not in the seat tube. Nearby the bottom bracket is a torque sensor and control unit for assuring the right amount of motor´s help to rider. The diameter of bottom bracket shell is1 20 mm. I think, even a bigger diameter is useful and it doesn´t affect the styling, but the company told me, it was enough for them.

  7. Mr, June 25, 2011 at 5:35 am -  Reply

    Yes, he has a prototype. Is there a working motor in there? Realistic production price-point? Still think powered scooters and bikes are fish and fowl: better to get one or the other, or both, than lose the advantages of each.

    • Vojtech Sojka June 25, 2011 at 8:02 am -  Reply

      Unfortunately the motor is not there, it is only maquette. Price is a question of the level of used parts. I´m convinced, the price could reach 2500 – 3000 Euro, comparable with the rivals. If you look at comparable bikes and the number of sold e bikes in the world, people are obviously willing to pay for these products. And I can´t agree that e bikes are fish and fowl. Can you ride a motorcycle or car in a pedestrian zone? Sometimes, going to work with bike is faster than with a car and many people can´t get sweat. E bikes have many advantages for a certain group of people, their are not for everybody, but for many customers they really do make sense

      • art June 27, 2011 at 2:11 pm -  Reply

        How much does the Headshok license add to the price?

        • Vojtech Sojka June 27, 2011 at 3:57 pm -  Reply

          I´m not sure, if Cannondale has patent for this type of fork. Probaly, they have rights for the system of Headshock, but many manufacturers are producing similar looking forks and I doubt, they pay Cannondale for it…But honestly, I don´t know it for sure

  8. biknz21 June 27, 2011 at 6:59 am -  Reply

    battery is located inside the down tube, not seat tube, right ?

    • Vojtech Sojka June 27, 2011 at 3:49 pm -  Reply

      Sure in the down tube

  9. Javier Cuervo June 27, 2011 at 9:16 am -  Reply

    Nice bike and nice wheels

  10. Tindellstar June 28, 2011 at 9:31 am -  Reply

    Rechargeable battery by solar or electric? Also how long is the duration on full charge? is it possible to make collapsible version? Also a suggestion: to help in remote areas where electricity may be a problem in developing charge will be ideal. Also it will be nice if the coatings on the frames “glow” in the dark. What do you think?

    • Vojtech Sojka June 29, 2011 at 5:01 am -  Reply

      The battery should rechargeable by electricity network. The estimated duration is about 60 km of reasonable riding – it means that you use also your power a bit, not only the power of engine. The solar charge is great idea, question is how effecitve it could be and also the price, because this kind of recharging system is probably quite expensive. And glowing in the dark is also usable, but I don´t know, if glowing coatings can be made in nice looking colors – maybe it would be more suitable to make glowing spokes or something less visible in the sunshine. And the bike could be made collapsible, but I haven´t designed it with this intention. I believe, for collapsible designs is better to use smaller wheels like Gocycle does. And one notice for everybody – the model doesn´t have engine and battery, so I would not call it working prototype. But I hope, the real working prototype will be available soon and I will give you more inforamtions

  11. Bill June 28, 2011 at 11:03 pm -  Reply

    I want one now.

  12. Jerome1678 June 29, 2011 at 2:53 pm -  Reply

    I LOVE this bike !!! do it and sell me one !!!!!

    From France

  13. killme July 28, 2011 at 3:36 pm -  Reply

    mediocre visualization of absolute nonsens:

    – not enought space for battery
    – rear part of frame will crack

    did you done any analysis or simulation of forces actuating the frame?

  14. Bicyclist May 30, 2012 at 5:25 pm -  Reply

    I respect your job, but with price of 2-3.000 euro, I do not believe anyone will buy it!

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