Commencal Supreme dh v1 project

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Rox
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Commencal Supreme dh v1 project

Post by Rox » Jul 15, 2017 10:53 am

Image

I've been lurking on the forum for a while, but now I'm about to start a project to electrify my trusty old downhill mountain bike. This is my first conversion and I don't know too much so I would appreciate all the help I can get. What I've gathered so far is that I would probably be better off with a hub motor as I don't want to start cutting off chain guide isgc tabs. The rear has 135mm spacing so I assume I can install Mxus motor with 26" dh rim or even motorcycle rim. The frame triangle is kind of tight so fitting in a controller and battery will not be easy. I was hoping I could get some saddle bag type storage or fabricate a small enclosure with very small battery. My main use for the bike would be riding up local trails so that I can coast down. I was thinking I would like to have just throttle and no pedal assist sensors or brake sensors.

What do you guys think? Do my thoughts make any sense?
Last edited by Rox on Jul 17, 2017 4:54 am, edited 4 times in total.

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the12be
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Re: Commencal Supreme dh v1 project

Post by the12be » Jul 15, 2017 11:09 am

brake sensors is a must :D if you pull the throttle the brakes will not stop it without motor cut off

but Yes like bike two in this post will work well just use one bike brake cut off on the back brake Or front if you got big balls :twisted:

https://endless-sphere.com/forums/viewt ... =6&t=38754

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Re: Commencal Supreme dh v1 project

Post by Rox » Jul 17, 2017 1:50 am

Wow, That carbon fiber-look alloy battery compartment is nice. I don't think I will be able to fit in a such a large one though. I'm aiming for rides of 5-20k so what kind of Ah I should be aiming for considering I would be using it just for uphills (50%) and limping home.

Do you really think the kill switch is totally mandatory? I've been driving a KTM electric motorcycle and I don't think they have such fail safe in place. I guess you can fit those fairly easily so it is not totally out of the question, but I would just want to build a clean build as possible. Minimum components = less parts to fail.

Where should I source the kit? I've bought bunch of stuff (LED lamps and carbon fiber mainly) through Alibaba in the past, but with electronics I get sent all kinds of crap. So I would maybe like to find a trusted vendor that can provide just the bits I need (motor with rim, battery, controller + throttle).

Rox

PS. Have been following this monstrosity here and I thought I would park it here for future reference:

https://endless-sphere.com/forums/viewt ... 28&t=79082

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Re: Commencal Supreme dh v1 project

Post by Rox » Jul 21, 2017 4:46 am

Where should I source the parts or should I just buy the kit from single source:

* mxus motor with rim = Can I order the hub motor with 27.9mm wide 26" DH rim or should I have it built locally at a bike shop with DT E540? Gear motor? 500-3000w for hills?
*controller = What is best? 12 fet or 18fet? Sabvoton I heard mentioned a lot of times
* throttle
* battery = Can somebody make custom locally or can I order suitable from abroad
* hydraulic brake killswitch
* charger = powerlab?

Am I missing something on my shopping list?

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the12be
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Re: Commencal Supreme dh v1 project

Post by the12be » Jul 21, 2017 9:44 am

torque arms

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soaresdacosta
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Re: Commencal Supreme dh v1 project

Post by soaresdacosta » Jul 23, 2017 1:54 am

https://em3ev.com/
For everything exept motor.


https://fasterbikes.eu/de/
For motor.


Luís.

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Cricket_Swe
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Re: Commencal Supreme dh v1 project

Post by Cricket_Swe » Jul 23, 2017 2:04 am

I can also recommend Em3Ev for battery. Got their large triangle battery and works great so far

Image

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Re: Commencal Supreme dh v1 project

Post by Rox » Aug 08, 2017 3:58 am

Thanks for the tips.

Would 4t motor be best for hill climbing? Any downsides besides not being able to go really fast on the flats?

<the12be>: Do you really think I would need torque arms? The frame dropout area is fairly beefy and there is a changeable dropout. I will take a pic for you.

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Re: Commencal Supreme dh v1 project

Post by the12be » Aug 08, 2017 6:28 am

please show me a picture is it like this
rsz_20170205_121009.jpg
Giant trance x4 re made swing arm / torque arm
rsz_20170205_121009.jpg (222.19 KiB) Viewed 1083 times
even this uses torque arms

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Re: Commencal Supreme dh v1 project

Post by Amiran » Aug 08, 2017 7:03 pm

inline fuse 100A
Torque arms
kill/regen switch
4t should do the job
programmable controller via Bluetooth to negate the use of bms for discharge voltage, current limitation.
more cells in parallel if you want to climb and batteries last long. I guess this also helps keeping cells in balance for longer interval between periodic balance charging.
invest time/money in throttle water interference.
above is my personal opinion.
good luck

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Re: Commencal Supreme dh v1 project

Post by Rox » Aug 10, 2017 4:53 am

Thanks,
I value the input. Faster bikes looks good. Do they post from within EU?

Shopping list:
* mxus motor
* controller
* custom torque arm fabrication?
* fuse
* throttle
* killswitch for hydraulic brake
* small backbag size battery
* charger

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soaresdacosta
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Re: Commencal Supreme dh v1 project

Post by soaresdacosta » Aug 16, 2017 11:12 pm

Hi,

Yes. Its inside U.E. No problems with customs.

Luís.

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Re: Commencal Supreme dh v1 project

Post by Rox » Sep 28, 2017 1:30 am

The project stalled a little bit since I've been busy riding my road bike, but I've been soaking up lot of stuff. Especially Grin technologies seems to have lot of cool videos on youtube. To be honest I got little bit discouraged by the drop-outs. The swing arms themselves are pretty beefy on Supreme DH V1, but I will need to fabricate a special insert torque arms since the original derailleur hangers are like this:

https://www.commencal-store.co.uk/rear- ... 2x12502578

https://www.commencal-store.co.uk/rear- ... 2x12502873

I suppose it can also be a blessing as I could potentially save the original hangers. I wonder if 3d printed part would work or do I need to have the torque arms machined.

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Re: Commencal Supreme dh v1 project

Post by Rox » Oct 03, 2017 5:11 am

Image
Image

It seems it will not be that easy to create the torque arms. Any suggestions? Just machine and attach with bolts on the swing arm?

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Re: Commencal Supreme dh v1 project

Post by Rox » Oct 10, 2017 7:37 am

What do you guys think if I take the black dropout hanger part on above photos and machine a replacement out of steel with a hole for a 10-14mm axle would that work?

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Re: Commencal Supreme dh v1 project

Post by Rox » Dec 29, 2017 7:51 am

Ok,

So I'm trying to nudge the project forward. I have been working on a 3d model of the dropouts to create a custom torque arm. Basically I just copied the existing removable derailleur hangers and changed the axle hole from 10mm to 10x14mm.

https://cad.onshape.com/documents/9310c ... a1fee385bf

https://cad.onshape.com/documents/b288b ... 28d68a95a6

The idea was to now to go 3d print in plastic the current design at the local library just to see how the part fits. After that I would add a torque arm to design so that I can attach it to the chain stay. Then I could have the part machined from steel.

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Re: Commencal Supreme dh v1 project

Post by Tats » Dec 29, 2017 8:42 am

Are you sure a grin TA won’t work? I have one on my Demo 8 https://endless-sphere.com/forums/viewt ... 1&start=25
945162C3-9BDC-46F0-9C1C-4EBCC496A011.jpeg
945162C3-9BDC-46F0-9C1C-4EBCC496A011.jpeg (77.21 KiB) Viewed 959 times
The upright piece can be flipped making the flat upper piece sit further back on the chainstay.

I use a Thule pack pedal for the battery, bit rear heavy, but my bike is used on road so it works ok for me. You could grab one of the battery bags that mount over the top tube to even weight out a bit - see the online market for them.

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Re: Commencal Supreme dh v1 project

Post by Rox » Jan 02, 2018 3:50 pm

I guess it could. I thought those things would be flimsy. Anyways I don`t know that is why I`m asking. How ever it is I don`t mind I took the time to do the modeling. It was good fun.

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Re: Commencal Supreme dh v1 project

Post by Tats » Jan 02, 2018 11:51 pm

The grin one is definitely not flimsy mate. The steel is strong and 6 mm thick. There is another TA for sale in the forum that mounts I think to the calliper bolts too, also looks like a strong steel.

Haven’t got into 3D printing yet, but certainly looks like a lot of fun when fabricating-I’m still a cardboard and scissors man...

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Re: Commencal Supreme dh v1 project

Post by Rox » Jan 25, 2018 8:50 am

Ok,
I will keep those in mind. Now I have been mainly trying to figure out where to purchase the conversion kit and/or motor inside EU. In the past there have been some group buys, but I guess nobody wants to participate in one anymore. The chinese holidays are coming so it will take time to get things forward anyhow now.

Rox

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Re: Commencal Supreme dh v1 project

Post by Rox » Feb 13, 2018 7:05 am

Just an update:

I bought a second-hand 1000W Coshin hub motor (HBS-48V1000W11061921) and a 48V battery. I don't know if that was stupid, but we will see. Now I need to source a controller, battery charger, TAs and some 14mm nuts. Anybody know if BMX axle nuts or normal M14 nuts will work?

I have asked for quotes for cnc machining the 3d modeled parts in China, but it seems it would be just too expensive to have that done. I guess I will have to be go the normal torque arms route.

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Re: Commencal Supreme dh v1 project

Post by Tats » Feb 14, 2018 2:18 am

FWIW the nuts on my crystalyte were not a metric thread

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Re: Commencal Supreme dh v1 project

Post by Rox » Feb 14, 2018 5:55 am

Thanks,
Good to know. That complicates things a bit. I wonder if 3/8″ threaded nuts would work.

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Re: Commencal Supreme dh v1 project

Post by soaresdacosta » Mar 06, 2018 5:11 am

https://endless-sphere.com/forums/viewt ... &start=225

You can not over-done. Keep simple. And if you have some one to help, with connections in a metal shop.

Luís .

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