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  1. J

    Through-the-Gears Project & OT Hydraulic Power Transmission

    Just an FYI - I built a through-the-gears ebike and put the "motor" freewheel down on the BB. That freewheel separates the motor-driven chainring from the pedal one. That way you wouldn't have to backdrive the reduction unit or power chain. I have used it for 2 seasons now. It probably has 1500+...
  2. J

    waste of time. don't bother.

    You could look at TNC http://tncscooters.com/partsdb.php?type=ES about 3/4 of the way down the page. Might take some cobbing to make it fit that motor - jd
  3. J

    BCD of sickbikeparts freewheel crank?

    From Wikipedia http://en.wikipedia.org/wiki/Wheel_sizing I believe what they call PCD is BCD
  4. J

    Rear Wheel acting as Generator

    I read somewhere that 2 wrongs don't make a right, but 3 lefts do :D - jd
  5. J

    Torque

    Also watch out for the white "paint" they use for crosswalks and other pavement marking, especially when it is rainy/wet. That stuff is bad for starting, stopping and turning - jd
  6. J

    1st crash (getting reimbursed by someone else's insurance?)

    I agree with many here: avoiding the accident is by far preferable. No amount of monetary damages will compensate for a future of pain and lack of mobility. As I've said many times here, I use blinking lights front, side and rear and ride with a helmet, gloves and bright yellow reflective vest...
  7. J

    Bonanza "Bulldozer" Dual PhaseRunner AWD

    Still, getting run over even once could ruin your whole day. That scenario scares me more than the rest for some reason. It might be because my normal reaction to the others is to lock em up, lay it down or try to steer around. Your options are more limited in a rear-ender, plus you can't see it...
  8. J

    Bonanza "Bulldozer" Dual PhaseRunner AWD

    IMHO, if you plan to act like a motor vehicle, ie move with traffic, in travel lanes and at higher traffic speeds, then emoto makes sense to me. Sturdier components and probably a good deal more comfortable. Possibly safer at any given speed above maybe 30mph, but the temptation to go faster...
  9. J

    Any solution for 20s or greater balance charger?

    John - look at the Accucel 8150 - $42 from HK http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=7523 Suitable for multiple chemistries including Lipo or LiFePO4, retains last setting, also programmable so you can load a different preloaded setting with a few button pushes. You...
  10. J

    Massive prejudice against ebikes

    Maybe this should be a new thread, but does anyone have real-world experience with trailering loads, from light to heavy? JCR says just add brakes, but that seems like it might get complicated. Surge, electric, hydraulic, cable - anybody tried any of these on bikes? I've used surge and electric...
  11. J

    Massive prejudice against ebikes

    My point is not that you can’t pull a heavy or large load with an ebike. There is ample evidence that it can be done. The question is: can it be done safely? I’m no physics whiz but it seems that turning or stopping a lightweight bicycle (e- or pedal) with a heavy trailer hooked...
  12. J

    Is it legal to ban electric bikes??

    I'm not a politician or public safety official, but I can see some justification for banning a motorized vehicle capable of going upwards of 40 mph from a narrow pathway that can be overcrowded with joggers, rollerbladers and families with children, pets and strollers. For those reasons, many of...
  13. J

    My homemade reduction drive

    I can see it working. I suspect most of the weight is in the motor. The shaft and bearings look heavier than they need to be but I don't think the savings would be a lot. I can't tell if the 2x4 is part of it or just a temporary spacer but you could probably replace it with aluminum or pvc...
  14. J

    Massive prejudice against ebikes

    How do you stop a load like that, or steer around a kid or lil ol' lady in a crosswalk? Some newsworthy innocent getting injured or killed by an ebiker hauling a load like that or doing 50 in a school zone (or both) will have predictable results - jd
  15. J

    Amberwolf's other "Bottom Bracket"-type Drivetrain Idea

    Regardless of whether the chain is bottom- or top-driven, I believe strongly that a crank freewheel is necessary for rider safety. I also don't see any advantage to not having one. By being able to shift the front derailleur into a lower gear, the front cranks will be spun by the motor even...
  16. J

    Best chemistry for mobile charging

    I use the AC 8150 with my 8 cell LiFePO4. It works fine so far. I believe HK sells power supplies for that charger. I made one out of a ATX power supply without opening the case. I just cut all the yellow wires and bundled them together, then cut all the blacks (except 1) and bundled them...
  17. J

    Amberwolf's other "Bottom Bracket"-type Drivetrain Idea

    From a quick look you need to get the rpms down to some reasonable number to drive the chain. A 16T drive sprocket at 300 rpms with 11-32 derailleur will give you 34mph with a 26" wheel in the highest gear. I might try a variation of T1Gabriel's idea: I would try a jackshaft arrangement behind...
  18. J

    Fantasy racing bike.

    I don't know anything about racing or dirt bikes, but if I were doing it, I think I would have the fwd on a throttle so I would have the control needed through the corners. Then I'd put the rwd on a momentary toggle switch and relay for use on the straights. As long as it's a fantasy, make it a...
  19. J

    Overclocking Unite Motor MY1016

    If you can do a little metal work you can do it pretty cheap. Pick up the LH thread ACS Southpaw 16T sprocket I mentioned earlier for about 20 bucks. It has a freewheel designed for left side installation and I think the threads will work with the Currie hub (24 tpi x 1.37"). Then cut the center...
  20. J

    Overclocking Unite Motor MY1016

    The ACS Southpaw is a 16T LH thread freewheel sprocket for BMX bikes that I think will thread onto the left side of the Currie hub. It retails for under $20. You can either do most of your reduction before you get to it or bolt on a larger sprocket. I've been using one with a MY1016 in a...
  21. J

    speed to watt ratio

    You can get a wider spindle from Cyclone or Sick Bike Parts. 158mm or 206mm. If you use the cranks you'll want to use a freewheel so you can rest your feet on the pedals while the motor is running. You will want to get the final rpms down to 150 or so at the chainring if you want to be around...
  22. J

    How would you evaluate these batteries?

    Here's a chart I made up with Excel showing wheel rpms for various speeds. It might be part of what you need - jd
  23. J

    Let's talk about brakes

    While modern rim brakes may have slightly poorer wet performance, the idea of terrible wet brake performance probably comes from older folks (like me) who remember side pull brakes on chromed steel wheels. When they got wet they got so slippery they seemed to accelerate the bike. It was scary...
  24. J

    How would you evaluate these batteries?

    Plus they are only 1C (20 amp max discharge current) - jd
  25. J

    Thundersky or Headway which would be best for my e-minibike

    How many amps are your motor and controller? I have no experience with Headways but they are well-regarded around here. I've had good luck with my 20ah TS from Elite Power Solutions. If you are in the US you can get the 40ah TS from them fairly quickly and for not too much shipping. You can read...
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