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I think d8veh meant the XFC V motor, 180mm, not the XFC K, 120mm. It's the same size as the BPM but Xofo people claim that their construction is better than Bafang's BPM

I think he means to parallel two identical 36V batteries. To reach 50mph, he'd need 50A 82V, two 36V 25/30AH batteries in series or a lipo setup.

I have a BBS01 250W. I get about 35 miles out of a 10AH battery. No throttle, PAS level 1.

this one is much better designed and much more sophisticated than the friction drive stuff discussed on ES. Using the bottom bracket to mount the friction kit is inspired. It has a pedelec sensor and properly unloads from the tyres when you stop pedalling. It solves one big problem with...

Loughborough is not far. Go try some Impulse Kalkhoffs at 50cycles.

No, I did not see that - how did you spot that's a code 10? the Big Bear has code 13 but I don't think the result would have been much different, may be plus half a degree in gradient. The CD Krieger runs on the same Big Bear controller and battery retains its high efficiency, above 70% at up to...

that's a very promising kit

yes, but the result is only justified wheen the battery is used for long life low current applications. A balancer does not fix a bad cell, it simply removes the positive feedback effect of a poor cell(s) in a string. You do get more charging cycles with a balancer if the battery is not abused.

No, you won't get much more torque using your battery in parallel. If you have a 72V controller, best to run your bike at 72V all the time.

Let's try a little qualification about the BPM motor and its hill climbing ability. The first chart is a BPM motor fitted to a 26" wheel with 20A controller and 15AH battery - like the woosh Big Bear. The rider's weight + bike = 100 kgs. Note the maximum speed 21.4mph and efficiency 78% at...

good question. The OP said it's very hilly, so I take it that the gradient is in the region of 10%-15% for Derbyshire. You can ride assisted at the legal 15mph on a BPM bike like the Big Bear up to about 7% - 8% gradient. It will then start to slow down. Above 12%, you can hear the BPM motor...

I have ridden your Tonado and all the woosh BPMs, the Ezee bikes, the Oxygens, a bunch of Bosch bikes and a couple of Impulse bikes. BPM bikes are not the best hill climbers. They are good up to about 10% gradient, after that, their performance peters out. Crank drives are consistent in power...

that's true. What prompted me to make the remark about what bike can get up 10%-15% (Derbyshire) hills is this: about the Cyclotricity 1000W Stealth bike with a restricted DD motor to make it street legal. To me, that's clearly the wrong setup. He would be less sweaty with any crank drive bike.

en France: 60 centimes la piece chez ozo: http://www.ozo-vehiculeselectriques.com/Accessoires/Rayons

yes, there are other models but without quoting specific models, it's clear to me that the average CD bike is more capable to climb hills than the average hub drive bike.

No. E-bikes are restricted to 250W to be road legal. Crank drive bikes can go up 15% hills slowly, hub drive bikes can go up 10% hills, 15% hills with hard pedalling. To go up 15% hills at 15mph, you'd need the BBS02 500W or BBS02 750W.

The Granite Pro is a good bike to start with. Its specifications are fairly basic, heavy, 24.5kgs and looks expensive for what you get. For similar specifications and lighter weight, check out a few For £599, you have the LEBC Vita Uno. http://londonelectricbike.com/electric-bike/vita-uno-26/...

The pancake displaces the right pedal by about 6cm. ugly design and way overpriced.

http://cyclotricity.com/stealth-1000w/ that's a direct drive motor, fast but not good for steep hills.

for high speed commuting on that sort of distance, the woosh Zephyr-B is pretty good. http://wooshbikes.co.uk/?zephyr-b for high speed on very hilly roads, the woosh Krieger is better. After that, you'll have to convert your bike with a BBS02 36V 500W.