band brake

[MarkFewtrell]

Ive never come across a brake like this before. On a Powabyke i bought. One rear cog. Not sure of model but clearly a commuter i think.

 

[MarkFewtrell]

drum brake?

 

[flecc]

No they are correctly called a Band Brake. They were often used on cheap Chinese e-bikes more than a decade ago but had a number of disadvantages, like squealing and eratic braking performance.

The advent of Shimano's roller brake spelled an end for them.
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[Fordulike]

Agree with flecc. Light years away from the progressive braking a hydraulic system offers. I remember mine tended to lock the rear wheel with hardly any extra brake lever travel. Horribly dangerous in wet conditions.

A lesson learned

 

[MarkFewtrell]

thanks. want to keep wheel. perhaps a disc fitted?

 

[flecc]

thanks. want to keep wheel. perhaps a disc fitted?

Different mounting I'm afraid. Here's a disc brake hub mounting:

Band brakes mounted on a wider boss like the one arrowed on the motor below. That's got a coating since the brake wasn't fitted, so I'm not sure if it was splined or threaded under the coating:

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[MarkFewtrell]

Thanks. When weather is better will get bike outside and take some better pics.

 

[MarkFewtrell]

can shimanos roller brake be subbed for this band brake.

 

[Woosh]

I don't think you can.
The non drive side motor lid needs to have support for the rollerbrakes like this:

 

[MarkFewtrell]

I don't think you can.
The non drive side motor lid needs to have support for the rollerbrakes like this:

 

[MarkFewtrell]

I see your point.

[/QUOTE]

 

[MarkFewtrell]

maybe sort a battery first. cant live with 12 kg lead acid!

 

[Woosh]

maybe sort a battery first. cant live with 12 kg lead acid!

you can replace them with new smaller and lighter SLAs but don't spend money on a Lithium battery for it, consider to let the old bike go.

 

[MarkFewtrell]

you can replace them with new smaller and lighter SLAs but don't spend money on a Lithium battery for it, consider to let the old bike go.

Im beginning to think the same. i paid £50 for it so no real damage. i dont know if existing battery works. it has a kettle plug.

 

[MarkFewtrell]

Im beginning to think the same. i paid £50 for it so no real damage. i dont know if existing battery works. it has a kettle plug.

 

[Woosh]

you can open the battery, inside there will be two or 3 12V SLAs. They are connected with crimps, so easy to replace if necessary.
Check the voltage with a multitester.

 

[MarkFewtrell]

you can open the battery, inside there will be two or 3 12V SLAs. They are connected with crimps, so easy to replace if necessary.
Check the voltage with a multitester.

yeh i understand the battery. maybe i should put a motorbike engine in it!

 

[flecc]

yeh i understand the battery. maybe i should put a motorbike engine in it!

A good way to get to know your local police better.

I agree on scrapping that Powabyke, today's e-bikes are so much better in every way. It's why Powabyke became insolvent after ten years of no change and had to be rescued.
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[MarkFewtrell]

Anyway to reuse the rear wheel and electrics with a new lith battery?

 

[flecc]

Anyway to reuse the rear wheel and electrics with a new lith battery?

You can reuse it just by adding a 36 volt lithium battery, but it will need to have a high discharge capability since that Powabyke motor can give up to 600 watts maximum power, the controller delivering up to 20 amps. But the motor is a brushed one and old, so could fail, leaving you stuck with an expensive lithium battery doing nothing.

That brake is the immediate problem though, you do need two brakes to be legal.
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