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the Bewo kits are only fractionally lighter than the BBS01 (4kgs versus 4.3kgs) but requires external controller, by the time you add the controller, the difference disappears. If you go for the Bewo, Woosh keep spares like replacement motor, gearbox, chainrings, cranks, cables etc. The Bewo is...

Like RobF, I particularly like the placement of the battery on the Ezee Sprint Primo because it gives a balanced weight distribution and slightly lengthens the wheelbase, helps with stability. The Big Bear battery placement on the rear rack has only one advantage which is stealth. When you park...

no, it's not normal on a brand new motor. It should be near totally silent without the chain.

yes, woosh.

member mechaniker is based in Fuerth, where Sachs Motors are and I understand that he's connected to SFM. Mechaniker has extensive knowledge of CD gearboxes, may he be interested in joining your project making a kv powered CD kit?

I think the guys at GoldenMotors are nice to talk to but most manufacturers use 8-Fun motors because they have the best quality control and performance / price ratios. A BPM motor costs about $120 and give the Pie 4 a run for its money any day.

In RC, the pack does not have a BMS. Don't you agree with the consensus that 36V is better than 24V because you can pull the same amount of power from the battery at lower current and the heat generated by the 36V controller is less than a 24V controller for the same power?

you've got serious hills there! I don't think a small SWX motor is going to cut it unless you are a serious athlete. Something like this £795 is more appropriate: http://www.cyclezee.com/ezee-sprint-primo.html

don't you agree with the general consensus that DD motors are heavy, have drag and consume too much battery for legal bikes? with regard to the 10C discharge rate, that's 10 * 20A = 200A, your BMS can't take that much surely?

thank you cwah for the long but excellent video. It explains very well why batteries die when slowly discharging.

the TCM motor you tested is powered by a 14A controller, your BPM is powered by an 18A controller, the BPM in the Big Bear by a 20A controller. That's why Woosh have put 20A controller in their Krieger (bigger TCM, the Krieger has the motor inverted, sitting above the downtube) to match the BPM...

that's one solution for the upgrade. You can push the torque up maybe 25% but are still stuck with a 6-FET controller. Nowadays, the standard kit seems to be the BPM motor + a KU93 9-FET controller and a 36V battery with a minimum 13AH capacity.

behind the seat post batteries: I've seen the length of the locking guide varies, the position of the output port at the base of the case varies, the charging socket varies, the pinout at the 4-pin output port varies even the dimensions vary. Just too many variables. Maybe dtg78 can tell us...

Thank you Billy. @ dtg78 - please post pictures of the label on the new controller and the connectors for us for identification. Assuming you have the LED panel lit and the voltage meter with all 5 LEDs lit, try this first: unplug the throttle and brake sensors then test the pedelec function.

if I understand correctly, Billy got a new 36V controller but still the 24V battery. He can't achieve much with that kit. Cyclamatic don't sell a compatible 36V and a new 24V battery from them costs £299.

the original Power Plus comes with a 24V battery. you need to have a 36V battery to use a 36V controller. If you connect a 24V battery to it, the motor won't start. It's usually not economical to upgrade a 24V bike to 36V because you also need a new battery which is difficult to find because of...

72 ^2/5.8=893.79 anyway, 4 * 1.2 = 4.8 I've got it wrong in the previous post, can't do mental arithmetics with this sort of numbers anymore, had to use the calculator this time.

No, you would burn it. You'll need to put 5 of them in series (5S), the resistance will then be 5 * 1.2 Ohms = 6 Ohms, the total dissipative power is 5 *120W = 600W, you will send into this array 54V * 54V /6 Ohms = 486W, well within its dissipative capability. To make a bigger system, put 10 of...

100 cells = 5kgs - too heavy for the standard water bottle two M5 bolts but nothing stops you linking two 52-cell packs to the same BMS.

the calculation is incorrect, but the principle of using these heaters is sound. The first step is working out the resistance of the heating element. P = V * I or 500W =220V * I therefore I = 2.2A Next, use the equation V= R * I or 220V = R * 2.2A, therefore R=100 Ohms If you connect one heating...