Can electrifying a bike be this easy?

[flecc]

If there is any motor drag on a Bosch bike, and I'm not convinced there is, it is nowhere near 16 per cent of pedalling effort.

It depends which Bosch version of course. With the current small chainwheel one, pedalling is through an epicyclic to bring cadence up to the higher sprocket speed, which will add some drag.
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[RobF]

It depends which Bosch version of course. With the current small chainwheel one, pedalling is through an epicyclic to bring cadence up to the higher sprocket speed, which will add some drag.
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But won't that be the same with the motor on or off?

I suppose drag is drag, whether it's created by the motor or some cogs next to it.

Perhaps someone on here could give their small chainwheel Bosch bike a try unpowered and tell us what they think.

 

[soundwave]

there is some drag from the motor when off and with the extra weight of the bike makes riding it alot of effort.

id not get that far with no power as for up hills no chance for me anyway

 

[flecc]

But won't that be the same with the motor on or off?

I suppose drag is drag, whether it's created by the motor or some cogs next to it.

Perhaps someone on here could give their small chainwheel Bosch bike a try unpowered and tell us what they think.

Yes, that will be there all the time, some drag is inevitable with drive through any epicyclic, but far, far less from that source than the 16% that was claimed.

But I don't know at what stage the freewheel is between the pedalled epicyclic and motor gears, so that could add a small degree if the pedalling turns engaged gears.
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[timidtom]

At last the Mini-motor and the Power Pak have been re-invented!