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  1. J

    Ezee - Brushless Geared Lithium kit !

    Hi James :) The limiter thing was probably my fault - I don't think there is a limiter now, based on Ypedal's results though I thought it a possibility with Wile E. Coyotes's results in the ezee conversion kit thread :). On hill climbing, its like Ypedal said but remember that the wheelsize...
  2. J

    eZee conversion kit

    Hi Joey I hope the kit works well for you & gives you plenty of grins :D. I'm not familiar with the torque arm, nor the lifebatt cells, but the usual eZee controller upper voltage limit is around 44V (there may be some small variation), so as long as your 12s cells are below 3.66V each you...
  3. J

    A Simpler E-Bike Display

    Or for something more basic 'like a speedometer with memory for things like distance traveled and time' the cateye velo5 or velo8 work well & reliably (velo8 also measures time elapsed & average speed for individual trips, but thats only time elapsed/average speed while moving - it stops...
  4. J

    How do you prevent a flat tube

    What's been said about good puncture resistant tyres, properly fitted, with good tubes at correct pressures & well-taped rims with no protruding spokes, should all prevent unnecessary flats until you get really unlucky. I'd not heard of maxxis hookworms, but having looked them up I don't see...
  5. J

    How do you prevent a flat tube

    For prevention of flats from the outside, Schwalbe Marathon plus tyres are supposed to be virtually flat-proof and probably add less weight than green slime too - they seem about the same weight as Specialized Armadillo (I think thats right?), and a bit heavier than my Kenda K-Shields, but well...
  6. J

    Ezee - Brushless Geared Lithium kit !

    Hi Ypedal The eZee lithiums have just had a new BMS which might help prevent cut-outs under load (its meant to) but the experiences with the eZee lithiums (phylion limn) up till now is that within a short time, say 6-12months or less, they can begin to cut-out under load - especially on hills...
  7. J

    ebikes.ca Hub Motor Simulator

    Hi Marty, Before you rush out & possibly buy a motor not best suited for your needs: Like Fechter & the others have said, to work out the top speed of a motor you need to know what power is needed to go x mph, and where that line crosses the red line of the motor's output power is roughly the...
  8. J

    Sram Sparc Geared Hub Motor

    I'm no engineer but I think grafting hub gears in would be very difficult technically. If you're interested how 2 or 3 gears could be relatively easily included at the design & construction stage (you might need funding or contacts to make this happen though!) take a look at this thread a few...
  9. J

    Sram Sparc Geared Hub Motor

    Cheers Jeremy, can get confusing all these terms & units :) (In case anyone finds it useful:) In order to try to relate the maths/mechanics to the real world, I try to think of torque as resulting from the power output, gearing & revs: a high gearing requires high power to get moving (i.e...
  10. J

    16" 20" 24" 26" Which wheel size is best for you?

    Changing the wheelsize for the same motor will change the acceleration/speed/current draw characteristics as said but two similar motors with different rpms should have similar acceleration/speed/current draw when 'geared' similarly in different sized wheels e.g. a 260rpm in 24" and a 320rpm in...
  11. J

    Sram Sparc Geared Hub Motor

    Interesting safe & a good point about peak torque/power: I hope this doesn't drift too far OT but the latest version of the panasonic (transmission drive) pedelec system uses hub gears and has a peak power output of around 340W which is delivered in a 1:1.3-1.5 ratio between pedal input & motor...
  12. J

    16" 20" 24" 26" Which wheel size is best for you?

    I think this is another reason why 'geared' hub motors (geared reduction) work well in low/moderate speed bikes: non-geared hubs tend to be either quite heavy or wide diameter (Bionx) to get their optimum rpm down to bike speeds and even then the high rpm of most of the crystalyte motors seem to...
  13. J

    16" 20" 24" 26" Which wheel size is best for you?

    Hi steveo AFAIK putting the same motor in a smaller diameter wheel should increase the acceleration & decrease the speed roughly in proportion to the change in diameter, so e.g. for 26" to 20" very roughly 26/20 or 1.3 times the peak torque,and 20/26 or 0.77 times the top speed: though the top...
  14. J

    Sram Sparc Geared Hub Motor

    Hi Freddy, You're right, the sparc system does seem hard to find details on, kind of obscure & maybe not the highest production numbers either, but searching around I'm pretty sure now that its a low power, single gear-reduction system and the hub gears are separate - for pedalling only...
  15. J

    Sram Sparc Geared Hub Motor

    I've seen some threads & details on this system & IIRC the motors in the hub (there are two, I believe?) don't drive through the gears, so single motor gear only and peak power output is also on the low side, even for lower speed, road legal electric bikes in Europe, so not the best for hilly...
  16. J

    eZee conversion kit

    Nice going Ypedal! :) Should be fine in front sus forks I think - Torq trekking has the same setup :). Good to hear its nice & quiet too. The marathon plus tyres are an interesting touch - they are the tyre of choice here in the UK for virtual puncture-proofness with good rolling speed and...
  17. J

    What do you think of this bike?

    I wouldn't be too concerned about gear wear & tear: as far as I know the gears should be very durable & require minimal maintainance (at the standard 36-40V and 16A limit at least), like regreasing after 10,000 miles I think? However, there is some freewheel resistance, due to the gears, but it...
  18. J

    What do you think of this bike?

    Hi Rob I got the same impression re output power shown on the simulator (its not clearly stated though). I wasn't referring to the simulator specifically, but for ebikes generally if the input power is known or stated e.g. 36V battery 15A current limit, peak input power is 36Vx15A=540W or...
  19. J

    What do you think of this bike?

    Yes I think you're right about efficiency of crystalyte vs ezee on the simulator, Rob: I suppose one advantage of geared hubs is the extra torque & hence faster acceleration they can offer over non-geared motors at low to mid speed and reduction of time spent running the motor at its least...
  20. J

    What do you think of this bike?

    Hi Rob I think its ok looks-wise: it resembles the Ezee Torq (top image - & I don't think it looks like a Grandma bike :lol: ), although that has 28" wheels & a front 570W (gross, peak) motor. I'd also wonder about the quality of parts, battery etc, for the price, and although the motor may...
  21. J

    For love or (little) money

    For love, maybe, but for little money I'm not so sure Mmag :roll: :) . A friend recently had a Boardman comp (from halfords) 700c fitted with a rear 260rpm 400W puma and 36V NiMH battery (in a crystalyte 'journey' case), 20A crystalyte controller I think - it made quite a light ebike - around...
  22. J

    eZee conversion kit

    Hi efreak :) Sorry not to answer you original post asking for opinions on the kit: I don't know anything definite, but it seems to be the same upgraded Torq motor as the Ezee Torq Trekking & does 22mph in 28" wheels @ 37V when delimited here in the UK: very much a pedal assist, though its...
  23. J

    eZee conversion kit

    Thanks for the detailed report, Wile E. :) very interesting. Do you have the Ezee motor in a 26" wheel? If so, I'm rather surprised at the lack of speed you've found with the Ezee motor: while the rpm is still likely to be rather lower than your crystalyte 4012 with 66V, a similar motor in...
  24. J

    Can you advise a clueless newbie please

    Hi Richard, Sorry I can't help directly re your motor, but you might also get some help at the pedelecs forums :D .
  25. J

    Old School Puma Stripped Right Down

    Hi knoxie Good use of your time while its wet; very interesting to see the "bare" essentials :) hope the rains easing where you are and you're not flooded :shock: . I like the look of the puma motors: do you have any torque graphs for any stage of their "evolution", preferably the latest...
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