Recent content by ebikes-sf

That's right. Crystalyte should just specify amount of turns rather than using speeds relative to voltage, like they did with older motors -5303,5403, etc... When 35mm hubs first came out a couple of years ago, this new branding scheme also caused a lot of confusion. That's why we decided to...

Hey guys, the built-in thermistor model is KTY81 210 , one lead connected to hall sensors ground (black wire) the other lead is a loose white wire. 2000 ohms @ 25 °C 2417 ohms @ 50 °C 3392 ohms @ 100 °C 4280 ohms @ 150 °C Dataseet: http://www.nxp.com/documents/data_sheet/KTY81_SER.pdf Have...

Tektro came out with a line of hydraulic ebrakes this year: http://tektro.com/_english/01_products/00_bikeslist.php?pid=2 E-comp has same brake pad size as Avid BB5/7 and fits BMC/MAC hubs but not bigger hubs like rear crystalyte H series. E-sub has smaller brake pads and should work fine...

I was curious and compared latest V2T (with V4 clutch and doubled phase wires) and V4T side by side, ran only a few tests, wouldn't say my testing was thorough, because not all planned tests were completed (different amps, load, rpm, etc...), but according to the data I was able to collect...

BMC front motor, Crystalyte 12FET analog controller and 14S 10Ah lipo built in frame - the aluminum plate acts as harness and heatsink for controller so it doesn't overheat being enclosed in frame bag.

Finally got error codes from BMC (red LED on controller PCB): 1. Continuously ON: Everything is normal 2. To glitter twice: Braking issue 3. To glitter three times: open circuit or wrong component value between Sense Resistor and LM358 4. To glitter four times: issue of mosfets at low...

Impressive Ego Kit video: pwS62Xfjzfg

As already mentioned above, Schlumpf high speed drive with 2.5X overdrive is great for higher speed ebikes. For anyone interested in getting one, be aware that special tools are required for installation as explained in this video: 0teCnQJskgQ

Gears are rarely a problem, it sounds like a separated V2 clutch: http://ebikessf.com/V2-vs-V3-clutch It can be fixed by welding two pieces together - very carefully though, to avoid overheating. Something I can do for $20. Or new V3 one-piece clutch and gears is $110. ilia

Another option is to go with geared hub motor and wide voltage range controller. Geared hubs are more expensive than direct drives but have more power to weight ratio, and they freewheel - if you run out of juice or break down, you can still pedal without drag created by motor magnets. For...

After my spoke supplier forgot to ship my order again, I finally decided to get my own Phil Wood spoke cutting machine with 15 to 12 gauge thread rollers, so hard to find 13/14, 13 and 12 ga spokes will no longer be an issue, I'm excited. Anyways, in process I learned that Phil Wood spokes...

Thank you for great review! LiPO may work good as an auxilary baterry pack, less cycle life than LiFePO4 but better capacity/weight/C ratio.

I know this doesn't help if only one CA (to be calibrated) is available, but I use factory calibrated CA-SA to calibrate CA-DPs to the controller's shunt: 1. Connect both DP and SA to battery/controller 2. Set Rshunt on DP to 1.000 3. Reset both CAs so they show 0.000 Ah 4. Lift up a motorized...

Nice wheel! I really like Wheelsmith DH13 spokes, they're 13ga at the shoulder, and 14ga on threaded end. I haven't seen one brake yet on wheels I built with BMC hubs. Sapim also makes similar very good quality 13/14ga spokes.

This topic may interest BMC 50A controller owners. These controllers are known generate big electric arc at power on caused by inrush current to charge five large capacitors inside controller. The video shows how to split caps from the rest of the circuitry so they remain charged after...