Recent content by josh

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...