Mark_A_W wrote:Are you sure you have the right winding motor?
With 48v I would be hoping for a no load speed of about 45kmh, which is closer to 30mph.
But glad to hear it is running and keen to hear how it goes with two motors, should climb straight up the walls!
The Stig wrote:Nice, when are we gonna see some vids? I didn't quite understand the problem with the front motor, did you not have enough washers or does the axle need some filing or something?
They only thing I want to find out with these little motors before I do my dual 108 motor build is how little drag they have when freewheeling. Did you observe anything in that respect? If you've owned any other geared hub motors a comparison would be great.
torker wrote:That's a good speed for offroading. Might get a little tedious for commuting. Or not. How fast did you travel on legs alone? How does that little motor pull from a stop? Get to speed pretty quick?
torker wrote:Also wondering. BMSBattery is not showing any ebike batts on their site ????
torker wrote:I just read on the CUTE hub thread that it is the Chinese new year till march. That may be why the BMS site seems empty of stock. Or maybe you have to be logged in to see it. Plus on ecitypower do you have to contact them for prices? Sorry to get off topic.
GrayKard wrote:I ran into a problem with the front motor. With washers installed inside the dropouts it caused some binding of the shocks.
full-throttle wrote:GrayKard wrote:I ran into a problem with the front motor. With washers installed inside the dropouts it caused some binding of the shocks.
Is there a way of installing the washers on the outside of the dropouts? Looking at the pics here http://endless-sphere.com/forums/viewtopic.php?f=3&t=14109&start=30#p221058 the axle is def long enough.
full-throttle wrote:Great build BTW!
cell_man wrote:Hi Graycard,
Is your front motor the same QX85 motor that you have on the rear? I assume it is as that's all that will fit with disks on the front.
cell_man wrote:I've got both versions and on 1 side of the axle there is a small nut that can easily be removed. If it were me I would start with that nut and take a little bit off of it. Just spending 10mins rubbing both sides down on a piece of sand paper would sort it. It's not doing so much there and doesn't need to be particularly strong. I'm sure you could lose maybe up to 2mm from that nut.
cell_man wrote: If you can find some quite thin stainless steel washers that might be enough to stop the binding.
cell_man wrote: I don't think the slotted washers that are included are necessary on the inside of the dropout and they are pretty thick too.
cell_man wrote: If you need a bit more removed I'm sure you could carefully take a little material from the disk side of the axle. As long as you get it reasonably flat I'm sure it will be just fine. If you carefully took some material off with a handfile it would be fine. If you wanted a proper job take it apart and get it machined down on a lathe. The Axle is actually 2 pieces. It's not so difficult to take the motor apart once you've made a tool to take the side cover off (it's threaded on) but if the motor hasn't been run yet it shouldn't be so tight.
Best of luck
cell_man wrote:Agreed the slotted washers that most ship with their motor are not great. The best 1s I've seen are those that ship with the Bafang motors. They are a proper machined part and can be used indide or outside the dropout.
When I say QX85 I just meant the width and that is the way Ecity described them. Basically the QX100 takes up the full width of 100mm forks and cannot accept a disk brake. The QX85 has fittings to bolt the disk directly to the side of the motor. The QX85 is a little lower powered though than the wider QX100. Both the QX100 and QX85 have 108mm spoke radius.
I reckon you'll be ok by just messing with that nut and changing the washers. Even modding the axle a little is no big deal with a steady hand and a dremmel
cell_man wrote:It shouldn't matter even if the nut is cut back as long as the washer you use has less than 20mm outside diameter. There is a recess on that side of the motor and if the washer fits in there it's all good. I would say that nut is very likely not required if it's replaced with a suitable spacer/washers. Try spinning the axle and looking at that side of the motor and you'll see what I mean.
LI-ghtcycle wrote:Love the Idea!!
I have to ask, do you plan on just using it for a commuter, or will you be doing some trail riding too? I have skeptic shop owner who doesn't think DH and electric bike go together.
I'd love to show your build as an example to prove him wrong!
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