Search results

you still need to bring electrical power to the sensors and display. I often wonder why battery case manufacturers don't have a cable trunking built into the mounting base of downtube batteries. That would make running the bus cable between controller to the handlebars instruments much neater.

the BPM motors are certainly robust, Replacement gearboxes and ball bearings are cheap too. Perfect choice for high milers.

Blewit post:

This one is the controller box: Open the controller box, solder a 14 gauge red silicone wire to the battery + terminal and a 14 gauge black silicone wire to the battery - terminal. Run these two wires to the bike's bottom bracket. Use some trunking to protect the wires. Fit a couple of...

a 14kg electric Brompton is indeed difficult to beat. It goes to show that often the ride quality of an e-bike is limited by that of the host mechanical bike.

yes, there is. But there is nothing like a cost free solution. Regenerative braking is only available on direct drive motors because they don't have clutch, so the coils will drive the wheel or the wheel drives the coils. Those motors are very inefficient hill climbers. Furthermore, powerful...

We had an interesting discussion over Christmas holiday about why most cylist fatalities in London are women and whether more women cyclists should take on e-bikes in London. My son's argument is that women would not take on e-bikes because they perceive e-bikes as giving more speed and more...

I think it does flecc. My wife and I love riding our e-bikes in France whenever we can, always enjoy it, never got frightened by traffic because the infrastructure is so generous towards biking. There is absolutely no perceived need for a throttle there. But riding in London is the opposite, the...

I agree. My post was in reply to KD's idea of a 1KW CD e-bike, made in China. I think the people who need that kind of speed are a very small minority, there is a much bigger demand for cargo bikes that need that kind of power and that the forum posts do not reflect the market shares precisely...

we still have a high proportion of new e-bike purchasers in their 60s and 70s here in comparison with the continental purchasers, I think the throttle as starting aid (limited to 4mph) may still be a valid selling point for years. They are more often perceived as useful by elderly women riders.

Hub geared motors are characterised by their constants Km (motor size constant) and Kv (motor velocity constant or back EMF constant). When your motor spins, it creates back EMF, when the back emf is as strong as the battery voltage, the current going through your motor is nil, you have reached...

I thought that may be the case but could not be sure. Not a big loss to many of us but somehow it feels like our freedom has been reduced by EU bureaucracy. Thank you for the concise explanation.

I reckon a 13T is a very sensible choice for low wearing. The GSM comes with 46T chainring. Maybe 50T is a better choice. You can fit any other chainring made for BBS01/BBS02.

If you want torque, get a BPM, if you want speed, get a crank drive motor. Hub geared motors are limited by their no load speed by design. 350W BPM code 10 gives 201 RPM at 36V as practical upper limit and still with reasonable torque. To get it spin faster, you have to increase the voltage...

and a toy 42V 2A charger. The two DD motors pull 800W from a 36V 3AH Lipo battery.

can someone enlighten me on this, is the old 200W (UK spec), full throttle permitted, e-bike can no longer be legally made?

Cyclezee are on your doorstep. http://www.cyclezee.com/ Pop in and try out their Sprints.

Kalkhoff make half their bikes with Bosch motors, half with Impulse motors. I think what members like to know is if the Impulse II is more or less reliable compared to the old Impulse and to the Bosch motors.

if the new rim is bigger than the one it replaces, you may need new longer spokes. can you measure both?

if they did, they would go get a 800W kit from bmsbattery or a BBS02 750W. We have instead numerous posts on promoting the ideas that 1) s-pedelec = pedelec + baddass dongle and 2) s-pedelec is sexy. They don't need it, just want to own it. Not cheap bang for buck.