Step 1: Find a Trike. and Motor(s)
also going to need a front sprocket from a donor bike pile. the bigger the sprocket the faster the bike will go (horsepower permitting)
the wheelchair has all needed parts. motor, controller, batteries, and controls.
other bits are from ACE hardware.
Step 2: Mounting the Motors
connected into the 3 speed hub i have 3 gear choices 1st gear is 50% underdriven (more power for hills) 2nd gear is 1 to 1 and 3rd gear is 50% overdriven (for more speed)
if you dont have a 3 speed you can connect the motors straight to the chain gear on the rear axle.
since it is an electric powerchair with 2 motors and the gearboxes had a 5 bolt hub i went to ACE and got some couplers and dug up an old front sprocket from a donor bike. placed the sprocket between the hubs and bolted the hubs together.
MAKE SURE BEFORE YOU INSTALL THE MOTORS THAT THE MOTORS ARE TURNING THE PROPER DIRECTION TO POWER THE BIKE.
motors are mounted on a board that is attached to the bike by the brackets that held the basket on originally.
you want to mount the motor solidly because it is going to put out 3 or 4 times the force of an average person pedaling.
also make sure the sprockets are perfectly aligned. If they are not the chain will slip off.
also make sure all bolts are on the bike frame or it can cause problems later on. i built this with absolutely no welding.
Step 3: Mounting Your Batteries and Building You Motor Cover.
in this build i placed the batteries as low as i possibly could on the frame and it handles very nicely.
batteries are heavy. find a good way to mount them. i used 1/2 in particle board to make my battery boxes.
while you build your motor cover keep in mind that you will need to get back into it regularly for maintenance. also you need a slot to engage and disengage the gearboxes.
most importantly the motors and power controller will need air circulation or they can overheat and fail.
i cut 3 boards for the verticals making sure they all matched up in height. then put a large board on top. the boxed structure keeps the bike very rigid.
all of the wiring is pulled from the powerchair with no cutting or splicing. make sure to zip tie the wires up and keep them away from the chain drive.
Step 4: The Throttle Control
i put a thin slotted board over the control stick that lets it only go forward and backward. OR you can go to an electric power chair store and have them reprogram the control box. but that costs money.
so after you have that sorted out. mount your control stick to the handlebars where you can easily reach it.
the control stick i have has a charger port on it so i can easily charge the batteries.
Step 5: Riding, Limitations, and Other Stuff
also in CA (Sacramento area) you cannot ride it on bike trails (American river bike trail) must use bike lanes on streets.
use google maps. they have great biking directions.
any more power and u will need to register it as a M2 (motorcycle under 149cc or electric) which requires license plates.
this bike has a power output of 700 watts. can reach 25mph very easily.
now the limitations of the mechanicals.
this bike does not go in reverse since it is hooked to a 3 speed hub. if i need to make a fast emergency stop i can throw the throttle in reverse activating the coaster brake in the 3 speed hub.
if you need to back the bike up you can throw the disengage levers on the gearboxes.
make sure you have both gearboxes re engaged before you ride or you can screw up your hubs.
make sure the chains are tight on the gears. no slack. but dont make it super tight or you will lose power due to the friction from the chain.
this bike can go about 25 miles @ 18-20mph on a full charge with no pedaling. charges in 6 hours.
you will need to tinker with the drivetrain a lot till you find mechanical weaknesses and get everything aligned.
I now have about 300 miles on this build and have had 0 problems.
if you have any questions about the build feel free to ask. i will keep posting any mods i have made to the bike.
Step 6: Finished Product
dont forget to add rear reflectors and a red blinking light so you can be seen by other drivers. and its the law to have them.