Custom middrive hardtail (with GNG motor)

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vlaca2   10 W

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Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11 2017 8:27am

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 1714 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 8:32am, 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

10 W
Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11 2017 8:30am

polarx1-640.jpg
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Test fit



IMG_1636-640.jpg
IMG_1636-640.jpg (204.71 KiB) Viewed 1714 times
Bench test.



IMG_1770-480.jpg
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Motor mount plan.



IMG_1772-640.jpg
IMG_1772-640.jpg (119.83 KiB) Viewed 1714 times
Chainwheel adapter plan



IMG_1789-640.jpg
IMG_1789-640.jpg (143.78 KiB) Viewed 1714 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   10 W

10 W
Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11 2017 8:37am

IMG_1867-640.jpg
IMG_1867-640.jpg (176.39 KiB) Viewed 1714 times
Motor mount.


IMG_1869-640.jpg
IMG_1869-640.jpg (196.48 KiB) Viewed 1714 times
Motor mount assembly



IMG_1908-640.jpg
IMG_1908-640.jpg (174.16 KiB) Viewed 1714 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

User avatar
vlaca2   10 W

10 W
Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11 2017 8:39am

IMG_1961-640.jpg
IMG_1961-640.jpg (159.42 KiB) Viewed 1714 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   10 W

10 W
Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 11 2017 8:42am

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   10 W

10 W
Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 18 2017 5:05am

Update1:

New handmade derailleur hanger for 48T/42T:
IMG_2082-640.jpg
IMG_2082-640.jpg (168.21 KiB) Viewed 1573 times
Installed ok:
IMG_2087-640.jpg
IMG_2087-640.jpg (223.1 KiB) Viewed 1573 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: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Dec 28 2017 7:48am

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   1 kW

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Posts: 491
Joined: Jun 13 2011 9:31am
Location: Australia

Re: Custom middrive hardtail (with GNG motor)

Post by Emoto » Dec 29 2017 1:21pm

nice build , like the alloy motor mount, i like alloy :) , nice music too keep it up man.

User avatar
vlaca2   10 W

10 W
Posts: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Jan 02 2018 9:46am

Emoto wrote:
Dec 29 2017 1:21pm
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: 96
Joined: Dec 19 2014 12:10pm
Location: Hungary

Re: Custom middrive hardtail (with GNG motor)

Post by vlaca2 » Jan 22 2018 2:19am

Hardtail ok, but i need full suspension.

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

IMG_2168 copy 2.jpg
IMG_2168 copy 2.jpg (134.36 KiB) Viewed 1096 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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