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that may be the case but he can't do much to his present controller. The only way to find out if his controller is restricted is to plug in a new after market controller and a throttle. If he does that without speed increase then he would have wasted his money. edit: I was wrong. the motor is 250W

I don't know the noload RPM. I guess his motor is 8-Fun SWXK 201 RPM, noload RPM about 220. That's why I said you've got to go by what the OP reported, he's got to about 16mph. With a more powerful controller, he probably can push up to 18mph on his 700C wheels, but it'll help on hills.

the Big Bear has too much power for you, that'd kill the pleasure of cycling.

where are you based? if it's not hilly, the woosh Sirocco is a good, reliable option for light assist, all weather commuting. http://wooshbikes.co.uk/?sirocco

you don't get much more in speed replacing the controller because the motor is limited by its noload RPM but a more powerful controller will help will hill climbing. A 700C wheel with low power motor will give about 20mph max. BTW, all e-bikes are supposed to have a 250W motor, the 180W is more...

The e-bike market is a a mature market worth more than £1 billion a year with thousands of models to choose from. A competent lightweight front hub motor weighs only 1.9kg and costs $90, the add-e motor weighs 800 grs and costs $800. You pay $710 to save 1.1kgs. There will always be room for...

why do you swing from one end of the spectrum to the other? the add-e is a very interesting solution but it is unproven and will not transform your donor bike into an equivalent of a Bosch or a Kalkhoff. Just ask them how much torque it has.

that method does not work, the Upstart does not have a speedo.

that depends on which year. The newest Upstart has much more sophisticated elecronics and 250W motor. But because the bike has torque sensor and LED panel display, you can't check out noload speed, only go by what the OP has reported. If the OP wants to look for an after market controller, he...

Leccy, cwah has got the T-shirt for short, medium and long commutes. His solution is sound. You run very little risk doing the same while saving yourself a pile of cash. A used full sus like his can be got for £300, add an Oxygen kit and a couple of hours will get you a comfortable and competent...

yes, that's a straightforward way of increasing the speed. If you've good experience of e-bike electronics, it's a 30 minute job. Replace the torque sensor with a thumb throttle for effortless riding.

speed limiter is only needed on bikes with big and powerful motors, usually fitted with an LCD for speed readout.The Upstart has a lightweight 250W front 8-Fun SWXU motor and no speed display.

I don't think the Upstart is restricted. It'll go as fast as you can pedal.

true enough but there are many who can't take care of maintenance. Better designs solve this sort of problems, reducing maintenance. Plus, square taper has 17mm spindle, Isis, GXP and Holllowtech all have larger spindles.

woosh stock the same 48V 10AH batteries. The button is illuminated blue. Push in to turn on, button is depressed, button lights up. Push again, button comes back flush to case, Backlight goes off. You can check the voltage at the output port, should see 54V when switch is on. Can also check at...

The order of the washers is right in this picture, just add the antitorque washer between the frame and the motor and you are good to go: on the non drive side, replace the washer next to the motor with the anti torque. You have to make sure that the motor axle is completely seated inside...

the anti torque washer goes between frame and motor.

the moment of inertia of the wheels is proportional to the square of wheel's diameter. I reckon 24" is about best compromise for 25mph-30mph.

I'd lace a DD motor to a 24" rear wide rim for your 26" bike. how fast can you ride with the Dahon?

I reckon the bike with the fastest rolling tyres would be favoured and the BPM can't have fast rolling tyres if it needs lots of traction.