HandlebarsRear wheel with motorBattery pack and controllerCable Management
OwnerSteve Erisman
Owner's Other EVGiant ATX 860 eBike Conversion (v2.0)
LocationLibertyville, Illinois United States map
Email email image
VehicleGIANT ATX 860
Motor 48V 1000W Brushless Hub Motor Brushless DC
Part of this kit:

This appears to be the same moter:
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Controller 48V 1000W 20A
Part of this kit:
Batteries4 CSB UB12180, 12.00 Volt, Lead-Acid, AGM
Note: These batteries have been sitting
around for a while, but tested to 11 Ah with
a 10 Amp load.
System Voltage48 Volts
Charger 48V 2.5A
Part of this kit:
Heaterwear a jacket
Instrumentationstandard bike computer
Top Speed29 MPH (46 KPH)
Note: This was achieved with electric power
only. At this speed the pedals no longer
help with my current gearing.
Range15 Miles (24 Kilometers)
Note: Largely depends on speed and how much
pedal assist
Watt Hours/Mile20 Wh/Mile
Note: Largely depends on speed and how much
pedal assist
EV Miles
Start:570 Miles (917 Kilometers)
Current:1,300 Miles (2,091 Kilometers)
Total:730 Miles (1,174 Kilometers)
Seating Capacity1 adult
Curb Weight100 Pounds (45 Kilograms)
Note: The batteries add 60 lbs. The motor
probably adds 10 lbs.
Tiresroad tires
Conversion Time6 hours
Note: most of this time was me fixing a
leaky tube and then trying to figure out
the best arrangement of items on the
handlebar. Otherwise, the actual
conversion could have easily been done in
1-2 hours.
Conversion Cost$275 for the conversion kit:

I already had the bike and batteries.

New, the batteries would cost around $35
each or $140.
Additional FeaturesOverall I am really impressed with the speed/power of this
setup. It is really fun to ride this. I am hoping to start
using this for my daily commute (7 miles each way). It will
probably take around ~6 cents of electricity (per day) vs. ~$2
in gas. I will charge at both ends to ensure the batteries
aren't too deeply discharged.

Eventually I would like to replace the VERY HEAVY lead-acid
batteries with a Lithium Ion battery pack of some sort.
6/19/2013: Over 500 EV miles logged so far! I have been
riding this to work and back (~15 mile
round trip) about 4 times a week on average, for the last 2
months or so. The battery pack is
starting to show some signs of age where occasionally the
last mile or two I am running on less
than 1/2 power. Also the rear rack is bending due to the
extreme weight of the lead acid
batteries. I am still hoping to switch to lithium ion
batteries at some point in the next
couple of months.

7/25/2013: Version 1 has been retired after about 700 EV
miles. The rim that came with the hub
motor kit wasn't good quality, or wasn't built right, and
ended up with some hairline cracks and
dented sidewalls. Also, the battery was down to about 3 Ah @
10 A (from 11 Ah @ 10 A) and
started cutting out after about 5 miles, and the rear rack
cracked (due to the extreme battery
weight). Some capacity was regained after using a custom
built desulfator for a week per
battery (immediately followed by a full charge), but the
decision to go Lithium Ion had already
been made.

8/28/2013: Version 2 will be posted soon and includes the
following upgrades:
* upgraded to Lithium Ion battery pack (14 lbs in a triangle
bag instead of 60 lbs over the
rear wheel). 50 V 18.5 Ah with 5 A charger.
* rebuilt the rear wheel with a Alex DM24 rim and Sapim
13/14 single butted spokes.
* enabled cruise control on the controller
* upgraded the freewheel with a 7-speed that has an 11t gear
(enabling decent pedal assist at
up to 24 mph)
* new pedals with half toe clips
* new soft grips
These updates make the bike feel and handle completely
differently and much closer to a normal

code by jerry