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    Loud Currie Gear Reduction Motor

    have a look at this brushes : http://www.aliexpress.com/item/10pcs-Angle-Grinder-Carbon-Motor-Brushes-14mm-x-6mm-x-5mm/2027077883.html Might fit the motor, and only 4.5$ shipped for 10 of them.
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    A 3D printed friction drive

    Looking good. by the way, why don't you print the various tests out of ABS and save the expensive colorfabb filament for the working designs?
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    A 3D printed friction drive

    Thanks for the files. I might use them for some tests sometime in the future. also lurking thread.
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    A 3D printed friction drive

    That is nice, I am working on my 3D printer these days, it can be a cool project to try once I'm done. Can we get a video in action? also can you share the STL files? Thanks
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    Upgrade the new GNG 650w (chain/sprockets)

    hey, if you can put the time and effort you can check at taobao, this could be what you are looking for: http://item.taobao.com/item.htm?spm=a230r.1.14.111.vsH3P1&id=19852235857&ns=1#detail if you want to buy, use any taobao agent, dont order directly from the site, sellers there tend to...
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    Stock GNG 450W - Chain or Belt? and Noise Level

    I tested my motor noise with "Sound meter" app on my android and got about 85db - 50cm away from the motor at full speed, starting from 60db with motor turned off. here is a recording, again, from 50cm away at the crank level. https://soundcloud.com/guy-da/my1016z2-motor-noise-246v if anyone...
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    Dani's mid drive (GNG motor) - CAD heavy pics!

    Did you order directly from taobao? because you cant since they dont speak a word in english and just wont ship the item. also the prices is for shipping in china only. you need some taobao agent (google - there are many) that buy the product for you and ship it to your place for extra $ - but...
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    Stock GNG 450W - Chain or Belt? and Noise Level

    doesnt the phones mic quality affect the readings? I think if you want to do it you will have to use the same device to record as well :?: but I will try to take a measurement for my brushed motor.
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    Upgrade the new GNG 650w (chain/sprockets)

    what did you change in the original chain to make you like the sound? it doesnt sound very loud in the video.
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    LightningRods mid drive kit - Iron Horse Sunday

    Wow, looking great. waiting for the videos 8) and the best part is that youre local - never thought there are any serious bike builders around :)
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    GNG 60v650w advices

    I think half link will eliminate the need of tensioner?
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    Stock GNG 450W - Chain or Belt? and Noise Level

    Waiting to see the results. will you make a comparison video? Yea I am looking for stealth mode :lol: for noise I have my geared motor - with it straight cut reduction gears there's enough noise to let people know I'm coming from a mile away :twisted: So for now I'm leaning towards the...
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    Stock GNG 450W - Chain or Belt? and Noise Level

    From what I've read its the tensioners that make most of the noise, I think I am going with the belt version, and few spare belts, if I could find a place that sells them.
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    Stock GNG 450W - Chain or Belt? and Noise Level

    Hello, I am interested in getting a kit from GNG, since the price is right and I have less chance of problems with the custom when I order from china, I am going to run it on stock everything, with 48v battery, 1000w of power is enough for what I need, the biggest hill around is probably 10%...
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    Which motor/kit ?

    What are you trying to achieve? you have hub motors, mid-drive motors There is tons of information here on this forum. GNG kits, LR kit, Bafang kit, Cyclone kit... You can use PB batteries, you may need 4 of them in series to get 48v to use with 500-2000w motor. and you cant use your arduino...
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    Dani's mid drive (GNG motor) - CAD heavy pics!

    :lol: --- also there are taobao agents that take commission, but give you final price + shipping, and they speak some kind of english.
  17. D

    chain and sprocket size question

    Hello, I found the following data for chain size here, : Chain#_________________Pitch____Roller Diameter__Roller Width____max sprocket tooth thickness Bicycle, with Derailleur____1/2"______5/16"_________3/32" (2.38mm)___0.087"____________ (this is the common bicycle chain size)...
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    battery connector type for GNG Mid-drive kit

    they call it "6.3mm connector" and the younger brother is "2.8mm connector". Dont know what the real name is, but thats the way I found it on ebay.
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    Noob Question | Where is the torque calculated?

    Thank you, I will be able to understand it better once I will get the chance to go out and try different gears and setups, Now its all just in theory since I cant ride yet. Thank you for all the help :!:
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    Noob Question | Where is the torque calculated?

    Oh ok, I looked at the thing the wrong way, I though the torque is a fixed value. so basically I need to match the gears to the road condition between max torque and top speed, to get the most out of the motor. for higher load I need lower speed to get more torque, and on flat I can use higher...
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    Noob Question | Where is the torque calculated?

    Hi, Where do I calculate the torque of the motor? the motor itself has about .8N.m, it has a reduction gearbox 1:9. then from the gear box to the crank another 1:4 reduction, and from crank to wheel the gear is 1:0.5 It is a 26" wheel, 24v motor 250w, 3000rpm. so, 3000 -> ~330 -> ~83 -> 166 RPM...
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    reduction gear box

    Hello, Is there any place to buy a reduction gearbox that can fit a 5/16" (8mm) diameter shaft? anywhere between 3:1 to 7:1 reduction will be fine. I know there are motor that has a built in reduction box , but is it possible to buy them separately? Thanks
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    Need help - How to calculate gear ratio on mid drive?

    Perfect. thank you both for your help
  24. D

    Need help - How to calculate gear ratio on mid drive?

    26" wheel, 2750rpm. 250w motor. so if I understand correctly, I can change the 48 tooth gear to 24, and the ratio will stay at 7.27? because now I must pedal to get things moving. I am not looking for speed (yet :lol: ), just to cruise around. thank you!
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    Need help - How to calculate gear ratio on mid drive?

    Hi, new here. I am really confused. how do I calculate the gear ratio on a mid drive setup? my motor has 11t sprocket, and it drives a 80t gear. the 80t gear is attached to 48t gear of the bicycle which drives the 24t gear on the wheel. so what exactly is the gear ratio? and can you please...
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