Thanks for the video of the 72V beast! I got tired of the 36V 500W Heinzmann brushed motor and since the brushes were all worn down, I opted for an upgrade while keeping the general aesthetics the same. This bike is one of the first street legal commercially built ebikes so I wanted to keep that "clean" image as I worked on its internals. Over 10K miles out of that motor. I only went through two stock sets of tires which is quite amazing as well.
Magic Pie 5 with Bluetooth adapter that shows/logs distance and displays volts, current amp draw, and speed.. on your phone! This is useful for programming new settings into the controller for things such as voltage (24/36/48), PAS, Regenerative Braking, Acceleration, etc. RAM adjustable clamp mount with X-Grip for handset.
Lighting was changed to a 5V 1200 Lumen Cree. I kept the stock horn the way it is, albeit a bit obnoxious on bike paths! Rear tail light was changed to a 5V laser/LED with turn signals and wireless controller. This tail light has built in battery that is charged by the rear pedelec wire (5V) near the hub motor.
Batteries: I upgrade my SLA a few years ago using LiMn batteries (Sony VT) found in Bosch 36V Fatpacks. They were rated at 36V/2A and I took (4) of them to create a 36V/8A pack that fit nicely into the existing battery box. The best part was that the LiMn chemistry was very robust and kept the voltage of each cell very close to one another without any balancing. Of course, I would check once in awhile, only to find them with acceptable range of one another (0.06V). Changed the charging pot on the stock battery charger to stop charging at 41.8V, and increased the amps to 2.5 (rated for only 2A). There are three pots on the charge controller board that you can adjust.
-- (4) HobbyKing Multistar 4S/20AH batteries split part to create (1) 14S/20AH with 30A BMS 51.8V (58.8V). I wanted to go all the way to 16S, but was reminded that I would burn out the controller once I exceeded 63V. I managed to wander between 33-35MPH on flat and clear pavement. The lack of rear suspension does not allow our eBikes to sustain these speeds for too long.. safely. HobbyKing also sells 6S/20AH that would be simple to connect in serial without any surgery to achieve 12S/20AH. I used 45A Anderson PowerPole connectors for all battery connections so I could use the stock battery box or custom battery packs. It also allowed for me to parallel or serial connections easily with the proper harness.
** Torque Arms MUST be used at these power levels -- I ordered a set from CycleEzee UK on eBay **
Brakes: Stock brakes were fading, yet functional. But once the speeds got up to uncomfortable levels, I wanted better stopping so I ordered a pair (only using front for now) of Avid BB7 and a rear Avid SD7 (not sure if I want to go the rear disc brake adapter route). Regenerative braking comes in hard and offers much assistance to my old and worn out stock brakes. Did I mention that they come in HARD?!?! I should try some other settings in the controller.
Maintenance: New KMS Nickel Plated Quick Link Chain (116L with 6 links removed). Remove headset and clean/lube bearings/race/seals. Remove bottom bracket (clean out rust in frame). Remove bearings in hubs and freewheel then clean/lube/pack with grease). Clean derailleur, repack spinning cogs with grease. I used hydrophobic marine grease. All old grease was hard, black, and crusty. Changed out both brake cables. I didn't know how to take apart SRAM gear shifter to change cable and lubricate shifter. Any pointers?
To Do: Work and stop spending more money on this bike!
Why do all this? Not sure...
I liked the clean look of the bike along with the strength of the frame. All wiring is nicely tucked away for a very streamlined look that is very pleasant compared to the mess of wires zip tied to frames and covered with duct tape. It's a classic!
I don't like the weight of the bike. The antiquated components. Incompatible gearing once I am at 48V or higher. The fact I spent all this money and time on a bike that is selling for $100 on CL. Thanks for reading.