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the rack on the Big Bear is about 9cm higher than standard height on a 26" wheel push bike. If you want a bike for a baby seat, the Camino and Gran Camino are more suited. https://wooshbikes.co.uk/?gran-camino second hand Big Bear: more recent Big Bears (from late 2018) have hydraulic brakes...

chain ring 44T, rear cluster 11T-34T. Yes

that's a better pictures. You can see clearly how fast the pulses are. If you can program the controller yourself, you can probably make the motor more flexible without changing the hardware. A bit like the free open source firmware stuff for the TSDZ2. By the way, I took the Brompton kit for a...

the controller can use the pulse width and frequency modulation to adjust how much power is sent to the motor. As I've shown in the previous post, the duty cycle of that trace was 5%. A 2.2mF capacitor can transmit a lot of power, 1kW is easy peasy. If you need more power, you increase the...

you need to remember electricity is wave. If it was flat, the signal across the Atlantic from the earliest telegraph cable (1858) would not have been scrambled. The early engineers did not undesrtand this, they increased the voltage until the cable burned out. Look at the wave forms on the...

Very funny. You know where I am going with this. Just to remind ourselves: Power = energy / time, a 22KHz signal has a wavelength of 1s/22,000 = 0.045ms = 0.000045 second. If your 48V battery is fully charged, the battery voltage is 53.5V. Your storage capacitor has 2.2mF capacitance, it...

you still have not answered my question: you said, "At 40V, this is less than 2 Joules of energy, that's not going to drive a "250W" motor for very long! " My question is: so knowing that the pulse width is 0.04ms, what is the power delivered through the coils? Answering this question may...

high voltage is important to reduce transport loss but bad for the longevity of the components and incurs bigger loss through EM radiations when you use in an oscillating circuitry like e-bike motor. I only use higher 48V instead of 36V to reduce the stress on the battery cells. In my days...

you got it wrong. The pulses going through the coils are about 22kHz-40kHz. the pulse going through the coils lasts only about 0.04ms. what is the power of 2J delivered in 0.04ms? It's not the battery that can deliver that power. It's the job for the storage capacitor.

you need to think of electricity like waves, the voltage at the storage capacitor is not same as battery's voltage. It is wavy, although connected to the battery with two short fat wires, black and red. the increase in motor current that is needed for more torque is partially supplied by the...

wheezy, that's not correct. The phase of the current and voltage in/on the coils are at 90 degrees angle current versus voltage. The coils are not resistors unless when it stalls, then the controlller will stop sending power to it. The amount of heat wasted through the motor is shown as = 1-...

wheezy, if a customer calls us about a bike, we always, always ask for his/her weight and height and where he/she lives. We make bikes with 40NM motors (85SX on the Faro) to Bafang BPM 65NM motor on the Big Bears. Horses for courses, the bike must be able to do the job. There is no need for more...

it's you who misread the situation. The Bafang G06 motor is robust enough, it's not a big problem to put 1kW though it for 10 minutes to climb a hill. I have said so many times. It's not kind to the motor but it'll live. It's the rest of the electronics. You need a proper 48V controller and LCD...

do you use a 48V controller? Can you compare the risk of frying the electronics between your controller and the 17AH Lishui HL controller on the OP's Rio FB? BTW, how many of those 4000 miles that you ride at over 22mph* that justify the overvolting? * anything below 22mph does not need...

as I said before, if you build a bike for 28mph, you are better off with a direct drive. You won't blow up the motor in 1000 miles. Let's recap, overvolting means you stick a 48V battery on a 36V bikes. Let those who did so to their bikes come say how many miles they've done with their...

Give me a valid reason to explain why you want to overvolt your kit. in my experience, the only reason for overvolting is because of this formula: RPM = Kv * Voltage. You want to shift your hub motor's RPM up by 30% when you put a 48V battery in a 36V kit. Take any of my hub kits: if you...

ask around - any suppliers will give you the same answer. Safety is the reason that they do not want you to 'mod' the electrics of their bikes. When you build a kit, you are the manufacturer, you know the risks. When you buy a ready made bikes, please leave the electrics well alone. I sell 48V...

yes, I did that about 6-7 years ago. I connected a GSM CD motor to it. I run the kit for a while on the test bike. I did the same with a TSDZ2. 48V battery does not work with 36V TSDZ2. Safety margin is built into a system for obvious reason. I did the same with a number of hub motors. The...

yes. You can also buy from our shop in Southend.

yes, there is a standard quick disconnect 9-pin connector about 7 inches from the motor.