Silvercross's hand built cafe racer

posted Apr 29, 2012, 7:27 PM by John Jenkins

Silvercross is an Italian student studying mechanical engineering. Since gas is getting up to 1.80 a euro per liter ($9 a gallon!), he needed a cheap way to get to school. This lead acid battery powered bike was definitely built on a budget, but the skill and creative spark of the builder was not on short supply!

Keyne's oil cooled dirt bike

posted Apr 19, 2012, 7:46 AM by John Jenkins   [ updated Apr 19, 2012, 7:46 AM ]

It's not often I stumble across a build that gets me truly excited! Even more rare is getting to watch history in the making! I present to you keyne's OIL COOLED bike. Yes, you heard that right: the bike has a cooling system that includes a pump and radiator. This may be the first actively liquid cooled hub motor ever.

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Dpearce's electro motorcross

posted Mar 16, 2012, 9:54 AM by John Jenkins   [ updated Mar 16, 2012, 9:56 AM ]

This carbon fiber monocoque frame bike is the product of three mechanical engineers senior design project. It took them around 4 months from design to completion and around $4k (although they admit they could of saved a lot of money and time if they'd found the endless-sphere forum sooner.)


12 - my kiyohime build

posted Jan 29, 2012, 4:03 PM by John Jenkins   [ updated Mar 16, 2012, 9:38 AM ]

This is a rebuild of my old ebike, codename kiyohime. Originally I used a fatass lifepo4 ping battery and a stock 9c hub. I ditched the big saggy battery, built a lipo pack, modded the 9c hubbie, and reassembled everything. The result is a bike that tops out at 50mph, but weighs so little it can be lifted with one hand and handles like a top tier mountain bike. It was a lot of work, but most of the "work" was learning all the skills needed to push stock components so far. Some cool things about this bike:

  • 500w motor able to run at 5kw continuous thanks to ventilation and temperature sensors. 
  • Fully rain proof.
  • Custom made clamping torque arms.
  • DIY lighting system.
  • Permanently mounted custom 22s10ah lipo battery pack.
  • Charges in less than an hour.
  • 20 mile range.

Check out this video I had a lot of fun making and

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Zombiess "HOLY CRAP IT WHEELIES!" cromotor build

posted Jan 21, 2012, 12:25 PM by John Jenkins   [ updated Jan 21, 2012, 12:35 PM ]

Now that custom hubmotor is making it's way into builds we can finally see how the cromotor handles. From Zombiess's initial impression it sounds like it scared the crap out of him! It probably doesn't help that he's running the massive hub in a 21.5" rim with a 125v battery pack and a 100a controller. Inside is a video of him hitting 60mph with this setup.

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Everything Justin Lemire-Elmore knows about hub motors

posted Jan 5, 2012, 5:38 PM by John Jenkins

Justin of grin tech once again proves that he does more to advanced EV tech than just about anyone in the western world!

He spends a lot of time talking about the trouble with water damage to hubs and hall sensors. Around 80% of the problems their customers have with hub motors is from water damage; which does a lot to re-enforce stereotypes of Vancouver as a very rainy town. His testing proves the theory that the temperature changes from a hub in use causes a negative pressure inside the hubs that ingresses water through the wires themselves as well as the various seals in the hubs.

Surprisingly, the option grin tech has settled on for preventing water damage and corrosion is ventilating the hubs!

Near the end he talks about he managed to redesign a typical 9c hub down from 6kg to 4kg while retaining the same performance! His design looks similar to the new, oft admonished Crystalyte G series.

Probably the coolest thing was the working prototype he built of a dd/geared motor hybrid hub. It's built so that on the flats it turns as a high speed DD motor, but for low speed hill climbing it turns to a slow speed geared motor. Very exciting, and very cool!

Kingfish's 2,500 mile trip to California on a 2wd electric bike

posted Sep 18, 2011, 11:32 AM by John Jenkins   [ updated Sep 26, 2011, 6:51 PM ]

2515.7 miles to California and back again in 28 days. This could be the title of Kingfish's 27 page thread on the ES. Part build log, part trip planner, and part picture diary, it's a good read for anyone interested in doing a long distance bike trip. Especially someone doing a long distance bike trip from Seattle to San Francisco on a trailer pulling, 2wd electric bike.

Kingfish's rig

Kingfish's trip (actual route shown in red) started in the "emerald city" of Seattle

He went through heartlands

Through forests

Up mountains
and climbed into the caldera of the largest shield volcano in the lower 48th

Sometimes he was all alone for hours

Of course he also met up with as many ebikers as possible

Stingray17, Snowranger, Chroot, Kingfish, and Greenmachine. Greenmachine's 0-30mph in 1 second trike in forefround.


Kingfish, Lyen, and Fetcher.

Farfle at his work, Bend electric bikes.

Snowranger and his BMC powered xtracycle.


From the gardens of San Francisco he made his way back up the pacific coast to Cascadia.



Then he rode the ferry, and he was home.


Bike prior to fairing and RWD.

Love the look of the fairing!

2wd baby!
A CA for each controller

Trailer with out fairing

Ready to roll!


I heard you liked batteries

Charged with modified meanwells
Probably from a pepsi machine

  • Farthest single distance in one day: 186.6 miles between Pioneer and Fresno :D
  • Farthest distance on a single charge: 165.3 miles between San Rafael and Fort Bragg :mrgreen:
  • Fastest Speed: :twisted: 44.0 mph bombing down Hwy 88 towards Pioneer. Average Max-Speed was 40.4 mph!
  • Average Speed: Fastest = 29.4 mph between Johnsville and Pioneer. Slowest = 23.8 mph between San Rafael and Fort Bragg. Overall = 26.2 mph.
  • Highest Pass climbed: Tied at > 8600 feet; Hwy 89 over Mount Lassen National Park going to Greenville & Hwy 88 over Kit Carson Pass going to Pioneer
  • Best Brewery: I thought the Park Chalet in San Francisco had the most memorable beer cos I wuz enjoying it with my ePals! :D
  • Worst moment: The Flat Tire, bar none. :|
  • Closest I came to running out of power: Tied at 54.3V left on the pack; coming into Fort Bragg and again two days later coming in to Gold beach after fighting the fierce buffeting with the sag dropping as low as 52.7. LVC was set to 50V so I had only a few minutes left – possibly ½ hour.
From Kingfish's stats and trivia post

The original thread is quite long, but if you have any questions about the trip or about the bike I'm sure they're answered; KF is VERY detail oriented!

Hyena electric bikes

posted Sep 17, 2011, 11:44 AM by John Jenkins   [ updated Sep 17, 2011, 12:51 PM ]

I saw this video and knew I had to make a post about Hyena. He's been active on the ES for years, and before he got sick he was selling ebikes and components down in Australia. In fact, right now he's working on a group buy of some Crystalyte x5400s (the big brother of the 30lb x5300 hub motors) for Australians.

"200w" legalization stickers - because aussie cops don't want you to outrun kangaroos

Speaking of out running animals - Hyena was attacked on a bike trail by what must be some sort of tasmanian devil or sinister platypus. Luckily his bike is not legal, and he could make a quick get away.

Hyena's bikes are what I dub off road "have a blast" bikes. A modern downhill or mountain frame with some lipo packs strapped to the top tube and a hub motor in the back. Simple, clean, and ludicrously fun looking.


Full face helmets and body armor -
If you don't believe in them, watch him walk away from some of the crashes on his youtube channel.

His 5kw Norco
Build thread here

He has a really nice battery setup for his bikes:

 A PVC box safely holds the packs. 


Modded meanwell PSU - with an amp meter!
And what's in side? 18s 10ah of lipo

Speaking of batteries - here is his opinion on some common ebike chemistries:

Hyena is a well liked and respected member of the ebike community. Just look at this package fellow ebikers aussie jester sent him:

If that doesn't say "respect", I don't know what does.

And now some real Hyenas:

The ease of the ebike grin

posted Aug 23, 2011, 12:49 PM by John Jenkins

I have to admit that all the really nice bikes on here don't use hub motors. It seems that anyone with the skills to build a real bike aren't going to waste their time diddling with a single speed hub motor. They'll give you tons up reasons why a non-frock motor is superior, and of course they're right, but the come back from the hub motor crowd is always going to be, "Well I have a bike that is fun, inexpensive, easy to build, and is running."

So in that vein, I'd like to show off two bikes: One is crafted by someone with a real skill and passion for the art, while the other could of been put together in an afternoon by just about anyone. Sure the non-frock bike will blow the hub motor bike out of the water by just about every metric of performance, but the real beauty of ebikes is simply how accessible building them is. Both bikes would be a blast to ride; even if we are comparing apples to oranges.

RWP's eCortina

First off, I'd like to say congrats to RWP for not only building an awesome bike, but also getting some mainstream press. You can see the respect he's gotten on the ES forum in his eCortina thread.

I'll spare you the sexy details and keep it brief: Astroflight RC motor, HV160 controller, Matt's reduction drive, 12s Turnigy lipo 10ah.


The bike goes "like a bat out of hell." It could reach around 45mph, but so far he's only tested it up to 35mph.


Clean workspace = clean build

He was planning on fitting eight lipo packs, but could only fit four. Now he thinks it's time to build his own CroMo full suspension frame! Once the bug bites.....

The bike looks finished, but it's not quite done. He's having some issues with the drive train; problems with the torque limiter, a jerky throttle, and an overheating motor. For as nice as this bike is, to him it's just a prototype! Hey RWP, I'll take it!

Lumumba's Black Lighting

Lumumba doesn't have 2000 posts on the ES. In fact, he had less than 10 when he started posting his new build. He got some help from San Diego Electric bikes, and exchanged a bunch of e-mails with Cell-man to get the ball rolling. He ended up getting all the parts direct from cell-man, and had Pat from SD ebikes help with assembly. The bike "lifts the front wheel off the ground" and hits 30-35 mph now!


Mac 500w geared "high torque" motor

45a 12 fet Infinieon controller mounted on the front for better cooling


Cell_man a123 lifepo4 16s pack (48v) in a Falcon EV triangle bag

For those of use who don't want to fab up a center frame battery box, this bag appears to be the way to go! It doesn't offer as much protection as a hard box, but it gets the weight of the battery just where you want. Also it doesn't require a work room and engineer to install.

Inspired by the "You're sitting on your penis" thread, he got a ISM Adamo Typhon saddle. I need to get one of those for my ole' boy.

This is a great looking bike, that's totally stock, and will give years of dutiful service. Here is the thread.

Motorized bicycle race at the Grande on oct, 22 2011

posted Aug 23, 2011, 11:51 AM by John Jenkins   [ updated Oct 4, 2011, 11:28 AM ]

Well it's that time again!
Time for ebikes to dethrone gassers at the sport they've dominated for the last century.

Fresh out of Paul D's dramatic last second win at the Tuscon Death death race in april comes another motorized bicycling race.

This event separates bikes into 5 categories:
  1. Ebikes less than 9kw peak or 11 HP
  2. 4 strokes
  3. 2 strokes
  4. Gas bikes less than 11 HP
  5. Anything goes gas or electric - within reason.
No motorcycle tires, but some moped tires are fine. All bikes must have functional pedals. 

The ebike class will run first to provide time to recharge before the final event. The ebikes will run two heats of 5 laps, and a final heat of 12 laps. The winners of this class will go on to the "Ultimate Race."

Since the track has no power outlets, a generator will be provided.

The Grange in SoCal

Track Specifications:
~3400' elevation.

14 turns
8/10 mile
950' straight away
Elevation Changes
25' to 30' wide asphalt
Concrete Curbs on inside turn radius
Concrete Rumple Strips at run-off areas
25' minimum run off

We are running the track counter clockwise.

For more info see these two threads on the ES:

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