Custom middrive hardtail (with GNG motor)

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vlaca2
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Location: Hungary

Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11, 2017 8:27 am

Hi All!

This is my first middrive build log.
I built one rear hub driven Specialized Bighit, its working fine, but i want some different beast :)

I selected GNG electric motor and LightningRod’s one stage idea.

67kV motor, 12S Lipo cca. 3200rpm full throttle.
12T/85T 219H chain, 1:7 reduction to BB (cca 460rpm on BB, less stress on components, no pedaling :) )
24T/48T bikechain 1:2 reduction to rear wheel.(cca 260rpm, low speed, high torque :)

The 48T and 42T is front chainwheel, mounted to cassette with special adapter. The other rear sprockets is from 8S cassette.

Now in test period i use 42T/48T and enjoy the torque :) The shifting partialy working, need some fixing for speed setup.

IMG_2072-640.jpg
IMG_2072-640.jpg (206.31 KiB) Viewed 678 times
Components:

- Magellan PolarX hungarian dirt/street frame.

- GNG motor, 67 kV “small block” from GNG
- GNG 12T 219H sprocket from GNG
- 85T 219H carting sprocket from local carting shop
- 219H 106 links carting chain from local carting shop
- 24T front chainwheel, 5 holes direct freewheel mount from Cyclone
- ACS freewheel from Eclipse UK
- 148mm ISIS BB from Cyclone
- ISIS freewheel mount crankset from Eclipse UK

- 3/32” bike chain from local bike store

- cassette to104BCD front chainwheel adapter from ebay
- 48T and 42T front chainwheel from local bike store


- Greentime 1500W / 40A controller from Greentime
- Turnigy Graphene 8000mAh 6s 15C 2pcs from hobbyking


First offroad test video:




https://www.youtube.com/watch?v=L4o_SCjO4ww
Last edited by vlaca2 on Dec 11, 2017 8:32 am, edited 1 time in total.
Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

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vlaca2
10 W
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Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11, 2017 8:30 am

polarx1-640.jpg
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Test fit



IMG_1636-640.jpg
IMG_1636-640.jpg (204.71 KiB) Viewed 678 times
Bench test.



IMG_1770-480.jpg
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Motor mount plan.



IMG_1772-640.jpg
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Chainwheel adapter plan



IMG_1789-640.jpg
IMG_1789-640.jpg (143.78 KiB) Viewed 678 times
Chainwheel assembled
Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

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vlaca2
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Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11, 2017 8:37 am

IMG_1867-640.jpg
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Motor mount.


IMG_1869-640.jpg
IMG_1869-640.jpg (196.48 KiB) Viewed 678 times
Motor mount assembly



IMG_1908-640.jpg
IMG_1908-640.jpg (174.16 KiB) Viewed 678 times
Motor mount assembly
Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

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vlaca2
10 W
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Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11, 2017 8:39 am

IMG_1961-640.jpg
IMG_1961-640.jpg (159.42 KiB) Viewed 678 times
Front chainwheels in cassette adapter.
Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

User avatar
vlaca2
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Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11, 2017 8:42 am

Throttle test:

Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

User avatar
vlaca2
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Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 18, 2017 5:05 am

Update1:

New handmade derailleur hanger for 48T/42T:
IMG_2082-640.jpg
IMG_2082-640.jpg (168.21 KiB) Viewed 537 times
Installed ok:
IMG_2087-640.jpg
IMG_2087-640.jpg (223.1 KiB) Viewed 537 times
Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

User avatar
vlaca2
10 W
10 W
Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 28, 2017 7:48 am

Short training video :)

Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

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Emoto
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Joined: Jun 13, 2011 9:31 am
Location: Australia

Re: Custom middrive hardtail (with GNG motor)

Post by Emoto » Dec 29, 2017 1:21 pm

nice build , like the alloy motor mount, i like alloy :) , nice music too keep it up man.
My first build #1 The long road https://endless-sphere.com/forums/viewto ... =6&t=50752
Build #2 Street Machine https://endless-sphere.com/forums/viewt ... =6&t=83235
My Diy cam Before go pro existed https://vimeo.com/33071514

User avatar
vlaca2
10 W
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Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Jan 02, 2018 9:46 am

Emoto wrote:
Dec 29, 2017 1:21 pm
nice build , like the alloy motor mount, i like alloy :) , nice music too keep it up man.
Thanks! :)


Circle (of power) :) :) :)

Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

User avatar
vlaca2
10 W
10 W
Posts: 93
Joined: Dec 19, 2014 12:10 pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Jan 22, 2018 2:19 am

Hardtail ok, but i need full suspension.

New build coming... :) :) :)

IMG_2168 copy 2.jpg
IMG_2168 copy 2.jpg (134.36 KiB) Viewed 60 times
Middrive hardtail e-bike build: https://endless-sphere.com/forums/viewt ... 28&t=91875
Scrub Psycho e-mtb build: viewtopic.php?f=35&t=66244
MBS Pro 12 e-mtb build: viewtopic.php?f=35&t=68710
Electric Drift Trike build: https://endless-sphere.com/forums/viewt ... 35&t=84936

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