Electrified Downhill bike
 

I got in some hub motors a few weeks back and laced up a wheel for myself. I ended up mounting it into my old downhill bike for grins and giggles, and so I would have cheap transportation around town. Works out to about a penny per 9 miles of travel at 20mph.

specs:

Rear geared brushless PM motor
Castle HV110 controller
12s2p a123
Magura throttle
Santa Cruz Bullit
Marzocchi Super T fork
Built up by me

Right now it is about 20mph on 36v. I have 12 more a123 cells so I can bump it up to 48v. Yesss, feel the power!! It already pulls wheelies....

Just curious but what do you figure your total cost to be?

Nice job BTW.

what is your average runtime?

Total cost of what? Electrics for the conversion are $800ish with the a123. Batteries are the bulk of the cost generally.

about 12 miles best guess, I haven't ran it down all of the way. A trip to town and back (8 miles) is about half of the capacity. This is going 20mph. If I add voltage and go faster my watt/hour/mile goes down.

Total for conversion minus the bike. I know some people that are interested in doing this and since I am into electric RC they asked my opinion.

For cheaper electronics you can get by with $500 no batteries. For more expensive electronics $600 or more is easy to spend, and you can get lighter with RC electronics. Add batteries on top, and that will be an additional $120 to $200 for lead acid and $500 to $2000 for lithium depending on range and voltage that they want.

That looks sweet. Do you do much downhill? I use to have a GT DHi

Not much downhill in missouri. I used to ride it urban a lot.

How many kv has that motor? That looks cool btw! Make a vid of it! :D

Been thinking about converting a hardtail for a while now, but decided to spend my money on an Ibis ($2700 with XT). Gonna go and pay for it on monday. Pretty good deal I thought.

That seat looks painful! :oh: :lol:

thats cool

that is awsome you should get a crystalyght motor but how does your magura throttle run your hv110

Thought I would post up another little project of mine. This guy is my campus cruiser. same hub motor as on my downhill bike, but laced into a 16" wheel and overvolted to 24s a123. Mighty powerful!

It uses a china made Ebike controller and throttle. Last night I realized that the throttle grip sucks and it was making my hand hurt!

Very nice! :yes:

I wouldn't mind doing a few projects like this myself.

Can you show us a video of that?

search youtube for holmes pink bike. It isn't the same build, but you can see me ride a tiny bike :D

That video was funny. :lol:

I think I may rebuild a micro bike like that, something to ride around at competitions. Maybe a three wheeler on 24v so I can have my battery chargers and everything attached. Like a mobile shop seat

Awesome work. Thanks for sharing.:intello:

Here is my last build. Running an HV110 , Magura 5k throttle, 12s 10ah hobby city lipos, and some larger hub motor.

About 25mph, good wheelies, and handles great. I get about 18 miles of full throttle thrashing on a charge, enough to go to town and back and have 20% left.


Pack fits in the frame right above the cranks. Next project is to weld up a battery box and some mount tabs on the frame.

Hey johnrob, nice build man. I have been doing some research on parts and equipment for an electric bike, as well as an electric motorcycle.

If I can get that 12x A123 cell deal for a somewhat bulk order, then it will be golden! 58cents / Wh for $65 for 12 cells.

If I go ahead on the electric motorcycle, I plan to use somwhere between 25hp and up to even 70hp. I still need to do more research on how much hp it compares to gasoline for bikes. In cars, it's about 2:1 ratio, of electric:gasoline performance per hp, like you need 1/2 as much hp to have the same acceleration as gasoline, but not topspeed.

Keep it up.

Man that is a sweet build. What kind of hub motor is that? I was thinking about getting the new 600 watt BMC hub motor. Can a bmc motor be hooked up to an hv 110 ?

The HV110 will work on any hub motor. This one is carried by ebikekit.com, but they are no longer importing rears.


The BMC motor looks pretty nice, although I think they are overpriced for what they are. Since I haven't taken them apart maybe I am missing something about the construction though. I have use the slightly smaller Bafang motors with great luck.

I got a motor mounted up on the LeToy for a RC style power system. I will be using a Castle ICE HV160 for now while an EV controller I am developing is in design phase.

Power system:
Astro 3010-6
12s 10ah or 20ah zippy lipo
ICE hv160
Magura throttle
Home made DSP for throttle to PWM converter
Hyperion 12s charger or raw DC power supply for charging
Battery Medic devices for balancing


I also laced up a matching rear 17" motorcycle wheel for it, I think it looks boss and I will be keeping it this way. A shot with 26" tires is in this thread for comparison.

All I need to do is tidy up the wiring, make a battery rack, and get chain tensioners and chain lines dialed in. And a rear brake would be handy. After I broke the last hub motor I sold the parts to a buddy. I tend to break every hub motor I come across. so this is the next shot.

http://www.rc-monster.com/forum/atta...0&d=1261171666

Power system:
Astro 3010-6
12s 10ah or 20ah zippy lipo
ICE hv160
Magura throttle
Home made DSP for throttle to PWM converter
Hyperion 12s charger or raw DC power supply for charging
Battery Medic devices for balancing


I would REALLY like to see a video of you riding a wheely on that going about 30 mph. What kind of HP is that putting out.

ES is down. Does anyone know when it will be back up? It was down yesterday too..:cry:

I dont know why its down and that sucks cause i look at that forum every day. There are some really interesting rc powered e-bike builds on there.

THIS is what i want!
http://www.stealthelectricbikes.com....th_bomber.html

only 125 pounds, it could replace my pitbike, can anyone find out how much they cost or give me a breakdown on what it would run me to put one together on the same level of power and range? Ive watched vid of a bunch of bikes but those stealth bikes REALLY changed my mind on these Ebikes.

That's bloody excellent mate. I love it. If you can get it to mono, I think your doing very well. You must use your body too though I assume?
I used the 5 inch Hobbywing ducted fans with KB45's & 2 Sentenials. I needed alot of road to move to top speed. Alot of clowns in cars attempting to chase me too at top speed. I was nearly charged, but I knew the law, lol.

Take care my friend on your electric bike,
Peter

nah,forget electric,you need THESE--http://www.jetcatusa.com/p200.html

52lbs of thrust at 112,000 RPM and only 5lbs a piece for the low low price of 5,595.00$ ! LOL

cool build,wish i had the know how to do as much with electric as you guys do.--josh

ES is back up fellas. Server issues.


The bike should wheelie under power just fine. The wheelbase is short enough and I will have about 5 horse on tap. Probably won't see me popping wheelies though, I need back brakes first.

The stealth bike is pretty cool, but they are very pricey. You need an 18 fet Infineon controller and a Xlyte 5305 on 72v to have a setup similar, about $800 before batteries. Divorced drivelines like mine are MUCH lighter for the power (25lb vs 8lb), about the same price and power, and are much easier to service.

how much are we talking for batteries? 24s 5p life or 20s 20,000 lipo? and where can i find the said motor and controller?

what would you recommend with a divorced setup electronics wise?

and how pricey are the stealth bikes? i cant find a price on them anywhere?

I think the stealth bikes are 5 to 6 grand, but it depends on the currency rates.

For the rest I suggest you go to endless-sphere.com/forums and check it all out. There are hub motors that can work too, and developments in all areas at the moment.

The biggest thing is to pick out what type of riding you are going to do. Street riding, just cruising, off road, etc.

For just the avarage electric bike I would expect to pay as little as $400-$500 plus a battery, but it can go up fast with better/faster electronics. A 44.4v 10ah 12s2p turnigy lipo pack would be an example and a 20c 6s 5000mah turnigy is just over $50..

http://www.ebikes.ca/store/store_nc.php

http://ampedbikes.com/kits.html

I have been checking out electric bike conversions for a few weeks now and I think I would like to convert a downhill/freeride bike to electric power.

I don't know what you are using in your bike Metallover, but do you know if anyone has had good success with the MARS 12hp BL ETEK motor? I know it's not very efficient at low power as it has high idle current. With this motor you could easily hit 100+kph without the motor breaking a sweat. But, also because it's not very efficient on the low end, you have to keep your speed up there to return decent efficiency, otherwise it's quite bad, below 70%, even 250watts @48volts, you are only getting 50% efficiency. So you know what I mean. This route would be FUN for sure, but maybe not so simple, or as efficient, and even durable in a bike.

The other option is a Crystalite X-5 series wheel hub motor, capable of 2000watts at 72volts. This would be a more efficient and probably safer/smarter, cheaper, simpler way to go obviously. However I would like to have up around 3000watts or more, like what the "Stealth Bomber" bike has. I have looked and looked, but I can't find a wheel motor with more than 2000watts, or at least a controller that will drive it more than that.

I know a downhill/freeride bikes are very stable at very high speeds, so I would like to be able to have a top speed of upwards of 100km/h or 60 mph... some of you might think that is way too fast, but i have held onto a car going 80km/h and it was absolutely fine, so I say 100k is doable.

The Stealth Bomber bike is exactly what I would like to do, as far as setup and looks. Would I be able to get a hold of the 3000watt wheel motor that they use? Do you think it is custom made motor? Or just over volted to obtain that power output?

-Batteries are most likely going to be A123 cells, either M1's or the new "Industrial cell" that Enerland/A123 has under 'coming soon' .... if not, then Headway cells are an option as well.
-Range I would like at 60km/h is around 40 miles

At this moment I don't know what route to do as I haven't seen anyone use the MARS BL ETEK motor in a bike except for this guy, but he is using a poor setup and appears to be using some weak lead acid batteries with it, which doesn't make too much sense. lol

Would like to hear some input from anyone who has built an Ebike.

Here is a pic of the frame I would like to use, if my oldest brother will let it go... although not the actual bike, that is the Ellsworth Joker frame. Can't remember the brand of forks, but everything on the bike is top of the line parts. Looks to be plenty of room under the frame for batts and electrics.

Also a pic of the MARS Brushless ETEK.

Here's a pic of my bike as it stands now (click for a direct link to the pic w/o photobucket crap)

http://i345.photobucket.com/albums/p...h_S7302291.jpg

I am running
9c (9x7) 26" rear hub motor
66.6v 10ah turnigy lipos
Ecrazyman 72v 45a controller
Hobbyking voltage/temperature monitor
Hyperion eos0610i charger

And on my list (recommended items)
Maxxis hookworm tires
More powerful power supply (8 hour charges suck:sleep:)
Cycle Analyst
Controller usb hookup (mainly to change the amp limit)
-Also am considering making the motor delta/wye switchable

The Hobbyking VT monitor is great. It provides readings and an alarm for low voltage and high temperature, in this case my motor. I wrote a review (at a great ebike forum) - http://endless-sphere.com/forums/vie...17958&p=262221

I got my controller from this guy on ebay. His name is Keywin and he is very helpful/knowledgeable and is a pleasure to deal with. His prices are great too. You can send him a message and tell him what you need. Tell him your motor and your voltage for an ebike and he should be able to pick you out a great controller. Let him know what you want for a lvc; I excluded the lvc. I have the 72v/1500w controller. 12fet iirc. He has larger and smaller controllers.

You can email him at ecrazyman@gmail.com

Keep in mind there are many other places that sell controllers/kits.

minimum you will need motor, controller, throttle, and torque arm(s). About everyone would recommend running 2, especially if you're running 750+w.

I've sent an email asking the obvious questions, including price. I'll post the response when it arrives

John at Stealth was very helpful & supplied the following information. Remember prices are is Australian dollars...AUD $1 = USD $0.91 (today)

Purchase price?

Standard Bomber - $6990 AUD
Standard Fighter - $5490 AUD
White Brothers fork upgrade - $1000 AUD
8 Pot brake upgrade - $400 AUD

Battery type, capacity etc?

Lithium (LiFePO4) 1.5kWh

Can I parallel in additional cells for longer rides?

In theory yes... in reality... you would have nowhere to put them... The
batteries consume the entire inside of the frame and weigh about 15kg.

Motor manufacturer?

It's based on a Crystalyte X5 but has a few of our own mods made.

Does the bike come with charger?

Yes

Servicing cycles/requirements?

Less than a normal mountain bike. Brake pads and chain are really the
only things that wear. I had a bike come in for a 6000km service a few
weeks ago and that was all it needed.

Lead time from order?

About 4 weeks


I'm seriously thinking about getting one of these now. What a machine!!