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that's because the rear suspension adds a fair bit of weight and soaks up a bit of energy too. To make a responsive rear frame that does not squeak is very hard, beyond most Chinese bike factories so prices are automatically high.

most 250W motors have 4.5 to 1 reduction, the BPM has 5:1 reduction, the torque on them beat the 500W direct drive by a large factor. At the same core RPM, same controller, 250W geared is 2.25 times torquier than a 500W DD. The real benefit of DD motors is reliability. They can easily do 6-7,000...

it's the clever fold of the Brompton that stops more of them from being converted to electric. The Brompton is so compact when folded that you have to remove the battery each time you fold. On some conversions, you also have to disconnect the control cables. If you need throttle control, then...

binesh, I think they confuse you with general discussion. There isn't any truth in saying that rim brakes won't break spokes while hub brakes do, otherwise Shimano and Sram would stop selling their hub gears because most of them have built in long life hub brakes (also called rollerbrakes). The...

perhaps they should charge battery rent per mile, some like 10p/mile.

there is no one size fits all.

for that distance, I recommend the woosh Big Bear on cycle to work: http://wooshbikes.co.uk/?bigbear

it's the rear spokes that binesh has problems with. On the Gallego, most of the weight is supported by the rear wheel. There is a bit of suspension at the rear by a neoprene block but it's nowhere as good as a coil like on the Zephyr-CDN. I normally would not over tighten those rear spokes, they...

I have no problem navigating panda's website with Chrome browser. They only have 250W XD kit in 26" front wheel at the moment. Alternatives to the XD kit: you can have 8Fun BBS01 crank drive with similar performance, easier to fit but more expensive.

check your rear tyre air pressure. Under inflated tyres are the primary reason that spokes break. You need to make sure that the rear tyre is inflated to 45psi - 50psi. Air pressure helps to stiffen the rim and spread the load across all spokes. For better retaining air pressure, fit Schwalbe...

do you have torque arms for that heavy front motor?

Flud, you misunderstood my post. F is the drag force, the equation or drag force is: F = 0.5 * Ro * V * V * Cd * A Ro is the air density roughly 1.223kg/cubic m V is speed, in m/s Cd is the drag coefficient, for a bicycle + rider, between 0.7 for a racer to 1.2 for an average e-rider. A is the...

the drag force F is proportional to the square of speed, but power consumption is also proportional to speed (P = FV), hence power consumption is proportional to the cube of speed.

that rear rack looks more robust than the usual battery racks. The way it's mounted also accomodates very well the smaller riders.

the law of diminishing returns, I don't think that there is much difference in build quality for e-bikes that are sold at over £2,000. Do any other men ride these step throughs ? Yes, plenty. Probably more step through e-bikes are sold to men than to women.

the average value for air resistance depends very much on your profile against the air, if you crouch, wear lycra and ride your aerodynamically optimized bike in a velodrome then 80W at 15mph makes sense. The real world figure for e-bikers riding at 15mph in a little bit of wind is 200W to 250W...

the file is clean. You can submit the link to online URL scanners in cases like this for peace of mind. If you want to be scared, take a look at the list of CVEs (common vulnerabilities and exposures) - thousands of places where your computer may be hacked...

Chinese bikes with or without throttle don't have this naturally balanced rider x plus motor 3x or 4x.

giving them a PC at the age of 4.