Mid Drive Steel Frame Bike

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
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Sauger-Junky   100 µW

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Mid Drive Steel Frame Bike

Post by Sauger-Junky » Oct 16 2018 10:52am

Hi,
i will show you our build we do the last months .
The Motor is a old Bosch Car Alternator it has 4500 rpm at 75Volt we do it like Sur-Ron 14 to 35 teeth to the pivot point and from there 14 to 51 teeth.
As Controller we try a 1500w Sun Fire some people run it till 7500w we will see...
The Frame is made by steel S235JR most in 40x20mm and WIG welded.
We hope we can do the first testdrive in the next weeks.
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2old   10 kW

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Location: Socal

Re: Mid Drive Steel Frame Bike

Post by 2old » Oct 16 2018 11:31pm

Nice work; might be able to sneak it by as a moped in socal.

Sauger-Junky   100 µW

100 µW
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Joined: Oct 15 2017 6:08am

Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Oct 30 2018 7:00pm

Today it gets a big step with the gear and the rear axle
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efMX Trials Electric Freeride   100 kW

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Re: Mid Drive Steel Frame Bike

Post by efMX Trials Electric Freeride » Oct 30 2018 7:05pm

really cool build, I'm digging the swingarm concentric jackshaft for power delivery without chain tension and suspension effects.. 8)
some ride & sk8 videos:
metacafe.com/channels/NATAS666DAMIEN
http://www.youtube.com/natas666damien
i have nothing for sale.. :)

Sauger-Junky   100 µW

100 µW
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Joined: Oct 15 2017 6:08am

Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Oct 31 2018 4:38am

concentric is a god idea but it is faster and easyer for the first build with slide drop out because the bracke can slide with the axle and we can use 19" up to 26"
concentric and bracke position ist tricky
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skeetab5780   10 MW

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Re: Mid Drive Steel Frame Bike

Post by skeetab5780 » Oct 31 2018 6:40am

Sub’d nice looking build! Nice to see someone tackling a jack shaft! Lets see if it puts the power to the ground when its done!

Sauger-Junky   100 µW

100 µW
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Joined: Oct 15 2017 6:08am

Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Nov 06 2018 6:27pm

Today we re install the rear swingarm
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Sauger-Junky   100 µW

100 µW
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Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Nov 08 2018 7:42pm

Now we install the Motor and wheels
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Sean9002   1 kW

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Re: Mid Drive Steel Frame Bike

Post by Sean9002 » Nov 08 2018 9:13pm

Any idea what the weight will be at the end?
I like this style of frame..the curved sections remind me of 'Pie Cuts' when welding up exhausts!
OSET 20+ - Custom frame and swingarm, Motorims - 66V
Ruff Cycles Porucho - MXUS 3000w - whitewalls - Gloss black/Pearl blue/copper leaf - custom tanks - bobber saddle
Giant Glory 00 - Clyte X5404 - Hubsinks - 18FET Sinewave
Fuji Nevada S - MXUS 35mm- Hubsinks - 12FET Sinewave
39inch longboard Dual 50mm, 12s lipo

Sauger-Junky   100 µW

100 µW
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Joined: Oct 15 2017 6:08am

Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Nov 09 2018 4:13pm

the frame is around 10kg
the motor 5.5 kg
with 18s 24ah we hope it is around 40kg

Sauger-Junky   100 µW

100 µW
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Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Dec 04 2018 6:26pm

Today we install the footrest
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shortcircuit911   100 W

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Location: Antioch, CA

Re: Mid Drive Steel Frame Bike

Post by shortcircuit911 » Dec 04 2018 8:20pm

Nice build man! Sub'd!

Sauger-Junky   100 µW

100 µW
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Joined: Oct 15 2017 6:08am

Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Dec 26 2018 7:43pm

We did some test runs and now we know the motor lose at 50 amp the magnetic field.
We cnc mill a new rotor. the rotor has a 103mm dimeter and it is 40mm wide so we think it is able to run till 12 kw :o
also we order a 96v sunwin controller that we can run 24s 2p 8ah
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Sauger-Junky   100 µW

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Re: Mid Drive Steel Frame Bike

Post by Sauger-Junky » Jan 15 2019 6:54pm

Now the parts for the alternator motor are complete.
its a 36n 12p so we make 2 magnets fore eatch pole that we get 24 magnets
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Overclocker   10 kW

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Re: Mid Drive Steel Frame Bike

Post by Overclocker » Jan 16 2019 9:54am

very nice fab skills! is that MIG welding?

btw i'm just a bit concerned about the strength of the swingarm since you cut holes in it (red arrow). this weakens the rectangular tube. maybe you could weld a circular "cap" over the hole to strengthen it

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