Reviews / build experiences of DaaHub electric bike conversion kit

[Oiseaux]

With the first batch of DaaHub kits sold I am wondering if there are any independent reviews from buyers re ease of build, first impressions, performance etc with special reference to (yawn) drag and noise (end of yawn).

Oiseaux

 

[Wisper Bikes]

Hi Oiseaux

They are still in customs, as soon as they are out with customer I will post.

All the best

David

 

[Scottyf]

I wouldn't mind one to test ;-)
I can give you an idependant review. An of course you can have it back afterwards...

 

[Wisper Bikes]

Hi Scotty, we have a few going out for review next week. When they come back I would be very happy to let you try one.

Best regards

David

 

[NRG]

Oooh! I'd be up for that as well David!



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[jerrysimon]

I am guessing this queue will get long real quick

Regards

Jerry

 

[Scottyf]

Its a bit far for me to travel but thanks for the invite!
Sounds promising anyway. Hope the testing goes well.

 

[vectra]

DaaHub- Drag?

Hi.
I sent the following email to Support at Wisper Bikes and await their response however meanwhile I would be very interested in any other comments or indeed experiences that anyobe might have.



I wonder if you could assist. I've "watched" an ongoing debate on the Pedelecs Forum re' "drag" on E-bikes whenever the motor is turned off.

The DaaHub kit would be fitted to my wife's Claud Butler stepthrough and she wishes to contine to ride the bike without assistance whenever possible. i.e. to use the kit to extend her range rather than supplement her riding experience hence any "drag" is an important factor.

The easiest test that I can think of is to imagine two wheels on two bikes. One bike fitted with the DaaHub with power turned off. One bike without the DaaHub.

If I were to spin the front wheels of both bikes at the same time, would the front wheels, in theory, stop revolving at the same time?

If not, what amount of difference is there in the time spent revolving?

Finally. I understand that the present stock of DaaHub is sold. Can you tell me as to when new stock will be avialable?

Thank you for your assistance.
Regards

 

[NRG]

I can answer that without having even seen or touched a Daahub motor. The motor wheel will stop first. The vast majority ofl DC motors will have some amount of 'cogging'... as each motor pole passes the permanent magnets used in the motor the magnetic field pulls the rotor back a little. This cogging will slow the wheel down sooner even if the clutch system was totally drag free....

However, the question should be is the total drag noticeable to an average rider. A simple spin down test does not reveal all and the only way to quantify any effects is to ride with the motor unpowered. The big issue with the Bafang motors is the permanently engaged satellite wheels, the clutch only disengages the drive planet wheel.

I'd like to see the internals of the Daahub to see what system they use for drive as this will be key in lowering drag and improving the riding experience.

 

[vectra]

I can answer that without having even seen or touched a Daahub motor. The motor wheel will stop first. The vast majority ofl DC motors will have some amount of 'cogging'... as each motor pole passes the permanent magnets used in the motor the magnetic field pulls the rotor back a little. This cogging will slow the wheel down sooner even if the clutch system was totally drag free....

However, the question should be is the total drag noticeable to an average rider. A simple spin down test does not reveal all and the only way to quantify any effects is to ride with the motor unpowered. The big issue with the Bafang motors is the permanently engaged satellite wheels, the clutch only disengages the drive planet wheel.

I'd like to see the internals of the Daahub to see what system they use for drive as this will be key in lowering drag and improving the riding experience.

NRG
Thank you. I'm looking for a quantitive response from Wisper however I do accept your point about the "simple spin test".

Going beyond the DaaHub are you aware of a motor that in practical use; would give a better score in my simple spin test?
Regards
vectra

 

[NRG]

Maybe the Toxgin motor. I'm going to take back what I said above though and wait for Wisper to reply and also for a side by side test.

I'm just messing about with my Alien forks at the moment (those crap Zoom ones everybody seems to love ) and I've just tired spinning the wheel by hand and it spins freely enough it would seem without any cogging effects....so my assumption is probably wrong...

 

[flecc]

The trouble with hand spinning, even very vigorously, is that it only achieves about 4 to 5 mph. Therefore it isn't testing for any possibility of freewheel binding at higher speeds.

 

[NRG]

Agreed Flecc, it was more a comment about motor cogging than anything else...

 

[banbury frank]

Hi

Its Not going to happen it is an electric motor with a freewheel not a bearing spindle Its like comparing the drag on the rear freewheel so compare it with the rear not the front



Frank

 

[eddieo]

Getting my DaaHub kit on Monday so will report back early in week......Keep it simple folks as not at all techy minded.

That reminds me I need to get a 160mm to 180mm adapter I think for front brake

 

[vectra]

Hi

Its Not going to happen it is an electric motor with a freewheel not a bearing spindle Its like comparing the drag on the rear freewheel so compare it with the rear not the front



Frank

H
Not sure what you mean. Could you clarify please? Many thanks.
Regards
vectra

 

[Wisper Bikes]

Hi Vectra

The next batch will be in the UK in mid July. We would be happy to reserve one for you.

I have asked Dapu for an explanation re the very low drag on their motor and whether it increases with speed, I imagine it must do. I will report back.

Nigel, if you would like a simple exploded version of the DaaHub motor please email me at dmiall@me.com.

All the best

David

 

[vectra]

Hi Vectra

The next batch will be in the UK in mid July. We would be happy to reserve one for you.

I have asked Dapu for an explanation re the very low drag on their motor and whether it increases with speed, I imagine it must do. I will report back.

Nigel, if you would like a simple exploded version of the DaaHub motor please email me at dmiall@me.com.

All the best

David

David Hi.
Thank you for the update on availability however I still need an answer to my query which was emailed to Steve:
"I wonder if you could assist. I've "watched" an ongoing debate on the Pedelecs Forum re' "drag" on E-bikes whenever the motor is turned off.

The DaaHub kit would be fitted to my wife's Claud Butler stepthrough and she wishes to contine to ride the bike without assistance whenever possible. i.e. to use the kit to extend her range rather than supplement her riding experience hence any "drag" is an important factor.

The easiest test that I can think of is to imagine two wheels on two bikes. One bike fitted with the DaaHub with power turned off. One bike without the DaaHub.

If I were to spin the front wheels of both bikes at the same time, would the front wheels, in theory, stop revolving at the same time?

If not, what amount of difference is there in the time spent revolving?"

Thank you for your assistance.
Regards

 

[Wisper Bikes]

Hi Vectra

As Flecc says the problem with simply spinning the front wheel is that you would not be able to spin it fast enough by hand to get to the speed that your wife would ride at. At low speeds all motors are relatively free running.

I have asked Dapu to provide some information as to why their motors are so good at speed.

I will report back.

All the best

David

 

[vectra]

David Hi.
Thank you. Look forward to it.
Regards
vectra