I have had a Crossfire -E for 3 years now. The bike is presently unusable.
Basically, when climbing steep hills where I live ( 15% to 20% or higher) on full power, the hub motor connection to the battery is wrenched loose, thereby losing all power because of rotation of the cover from which the connecting cable emerges from the motor and with it the cable itself.
When this first occurred, I thought perhaps I had forgotten to tighten the wheel nuts, but having tightened them "properly" but without a torque wrench, the same problem happened again -and again, the distances travelled before the problem occurring being progressively less each time. I have had the rear wheel off this bike quite a number of times and have reasonable experience, admittedly from years ago, in bike disassembly and reassembly, though of course, not of E Bikes.
Just to put a fly in the ointment, there is a lugged washer which fits over flats machined into the axle on the cassette side, , the lug then fitting into the bottom of the dropout to enable the wheel nut to be tightened so that the dropout does not bind on the cassette and to anchor the axle. This washer broke in two within the first year but could still be slotted into place. The cassette still revolves freely round this washer.
I decided to mark the axle, axle nut, wheel and motor cable cover to see what was actually rotating and test the bike again. On cutout,, the motor cable cover had rotated 180 degrees anticlockwise as usual from bottom to top, the axle was where it was when I set out, or had rotated 360 degrees and the left hand axle nut had moved from 6 oclock to 8 oclock but had partially unscrewed itself. I am a bit perplexed about the wheel nut because as long retired petrolhead, as well as the bike experience, I know how to tighten nuts and bolts.
Looking at whether the (now fractured) lugged washer is responsible for anchoring the axle in place, I find it difficult to believe that this is solely responsible for preventing the axle from turning, given the huge torque which the axle has to cope with on full power up hill. It is brittle poor quality metal. And I am wondering if the internal part of the motor through which the axle is threaded has come loose in some way. I know obviously that the motor in general revolves round the axle.
I am sorry this seems a bit complex, but has anyone else had this problem or has anyone any ideas about it? Or is it me, probably, not seeing the wood for the trees?
Basically, when climbing steep hills where I live ( 15% to 20% or higher) on full power, the hub motor connection to the battery is wrenched loose, thereby losing all power because of rotation of the cover from which the connecting cable emerges from the motor and with it the cable itself.
When this first occurred, I thought perhaps I had forgotten to tighten the wheel nuts, but having tightened them "properly" but without a torque wrench, the same problem happened again -and again, the distances travelled before the problem occurring being progressively less each time. I have had the rear wheel off this bike quite a number of times and have reasonable experience, admittedly from years ago, in bike disassembly and reassembly, though of course, not of E Bikes.
Just to put a fly in the ointment, there is a lugged washer which fits over flats machined into the axle on the cassette side, , the lug then fitting into the bottom of the dropout to enable the wheel nut to be tightened so that the dropout does not bind on the cassette and to anchor the axle. This washer broke in two within the first year but could still be slotted into place. The cassette still revolves freely round this washer.
I decided to mark the axle, axle nut, wheel and motor cable cover to see what was actually rotating and test the bike again. On cutout,, the motor cable cover had rotated 180 degrees anticlockwise as usual from bottom to top, the axle was where it was when I set out, or had rotated 360 degrees and the left hand axle nut had moved from 6 oclock to 8 oclock but had partially unscrewed itself. I am a bit perplexed about the wheel nut because as long retired petrolhead, as well as the bike experience, I know how to tighten nuts and bolts.
Looking at whether the (now fractured) lugged washer is responsible for anchoring the axle in place, I find it difficult to believe that this is solely responsible for preventing the axle from turning, given the huge torque which the axle has to cope with on full power up hill. It is brittle poor quality metal. And I am wondering if the internal part of the motor through which the axle is threaded has come loose in some way. I know obviously that the motor in general revolves round the axle.
I am sorry this seems a bit complex, but has anyone else had this problem or has anyone any ideas about it? Or is it me, probably, not seeing the wood for the trees?
