View Full Version : Hub Motor for Streetfox

03-03-2009, 03:35 PM
I ordered a hub motor for the Fox which should arrive by Thursday. I'll have to make some mods for 18ah batteries, but with a foot of snow on the ground, that won't be happening for at least a week. With the electric assist, I won't need a granny gear, so I'll be using a 14-28 5 or 6 speed freewheel. I'm not looking for speed either, just help getting up hills, so I'll keep the single 32 tooth chainring for simplicity. I ordered the motor without batteries, because I wanted more than 12ah. It's from E-Bike, and comes with brake handles with cutoff switches and a 25 amp controller. It was $406 with shipping.
I have a LWB tapole planned for the Nexus 8 speed hub that the hub motor will replace. This will have a 20" wheels all around and some frame reinforcement to prevent the frame twist I experienced the first time I attempted it.

03-04-2009, 07:45 AM
That sounds like it's gonna be a sweet setup, Kid. :)


03-04-2009, 12:55 PM
Lets us know what type, price and where you get your batteries from -- I'm keeping one eye out for a good deal -- and hurry - it's hard trying to see with just one eye.


03-04-2009, 11:16 PM
So far, the cheapest lithium batteries I found are from Golden Motor. $298 for 10ah, $425 for 15ah. I found some 12v 20ah lithiums for $160 each, and another $100 for the charger. I found some 18ah sla's for $29.54 each with free shipping, plus a charger and the wiring with fuse. I think I can find a charger and the wiring fairly cheap.




For controllers and wiring parts:




The kit came with 2 brake levers with cutoff switches. I only need one, so I'll replace the other one with a keyed switch. Then I'll have a lever with cutoff switch for the DR, which will eventually get a motor with gear reduction bolted to the rear end.

03-05-2009, 03:41 PM
The hub motor has a 14mm axle, which won't fit in the dropouts. I'm not sure if the motor is compatible with suspension either. I'm going to make a new rear end with a simple tailbox. I'll start Sunday. By then the snow will have melted, and it's supposed to be in the 50's. In the meantime, I'll cut some pieces in the basement, and possibly have new dropouts made before Sunday. I have a frame for a mesh seat that I can rebend and utilize for the tailbox frame. I'll cover that with some spandex and add two coats of epoxy resin. I also have some plastic and scrap wood for building a small greenhouse so the epoxy will dry faster. Back in the 70's, I had a small year round vegetable garden under a greenhouse made of plastic, which on the coldest days still got up to 80°, hot enough for the epoxy to set properly.

03-05-2009, 05:26 PM
Before selecting batteries, you might want to read this:


...and check out Ebike's line of batteries, controllers, etc. While you're there.

Justin and Zeb at Ebikes know a lot about the quality of available batteries and if you email them will give you further insights. Suffice it to say, buyer beware of seemingly inexpensive batteries, from China especially.

Also worthy of consideration are NiCd and NiMH batteries. I'm planning to use Ebike's 48 volt 8Ah NiCd pack for my electric Street Fox.

Radical Brad
03-05-2009, 08:20 PM
I can vouch for Justin as one who knows his stuff! He stayed the night here when he rode is electric bike across Canada powered by the same 48v pack you were looking at.


03-05-2009, 08:54 PM
Thanks for the info. I ended up getting 1 35ah sla and 1 12ah sla for temporary use, since I already have 2 of each and my neighbor just gave me a 36v 3a charger. So for 90 bucks, I'm ready to go before having to buy lighter batteries. Now I can wait to buy the batteries I want and still have a usable e-trike. The Chinese batteries concerned me also, so I'll probably get mine from ebikes. I didn't get the Golden Motor hub kit because my research reveals they're inconsistent, and it's hit or miss as to their performance. Also, Golden Motor's support is almost non-existent, according to their customers.
Most of my incursions are less than a mile, with 1 or 2 per month being 3 -8 miles one way tops. Still, it's getting harder and harder to make it up the 2 small hills on my 3 per week trips around the corner, even with the granny gear. That's the main reason for getting the motor in the first place. So i'll use the 12ah pack for everyday use, and the 35ah pack for the longer trips.
According to the ebikes calculation charts, even if I do the 8 mile trip to my cousin's house, and triple the 20 wh to 60 to account for the heavier weight of the trike and batteries, I'll still only need 15ah to make the trip with a 36v battery pack. So with pedal assist, and charging the batteries while I'm there, I should make it there and back pretty easily with ebikes 18ah Nimh batteries. Kind of pricey, but to me it's worth it.

03-13-2009, 11:12 PM
I found out the motor I ordered can be used with rear suspension. All I had to do was add to the dropouts to accept the torque arms. I added a little more on the drive side to accept a derailler. I'll be welding them on tomorrow.
The kit came with a battery wire for hooking up to LiFePO4 batteries. My batteries have a 2 prong wire. So I removed the LiPo connector and spliced in a fuse wire and two 2 prong connectors. One goes to the charger port, the other to the controller, with a switch between the port and controller. The switch will be attached within easy reach of the seat, because I use the handlebars for support getting on and off the trike, and I don't want the power on in case I accidentally twist the throttle.
This is a 500 watt motor, and since Brad uses a 450 watt motor on the Long Ranger, Maybe I'll cut the boom and make this a 3 wheeled wheelchair with USS. I can replace the boat seat with my power chair seat, complete with the swivel. Just a thought.

03-14-2009, 11:52 PM
The dropouts are welded on and the rear is repainted. I'll reassemble tomorrow with the hub motor in place. Then it's just a matter of locating the batteries and controller. I got a hold of a compact 15 ah battery pack for scooters. With a small mod, I can fit it under the seat. It was recommended that the battery should be as low as possible due to the suspension. I was told that this pack will power an 85 lb. scooter with a rider up to 250 lbs. for 5-10 miles. I intend to use the motor only when necessary, so it should be okay for what I use the trike for. I'll put the larger batteries on the DR when I get around to installing the motor for it.
I could put the switch anywhere, I just have to remember to apply the brakes while getting on and off to cutoff power to the motor. I think I could mount the controller behind the seat without much modding. Ill soon find out.
I decided to eventually get the LiFePo4 batteries, but it will be a while before I can get the bucks for it.