Battery built into the reat wheel

[Bigbee]

Is this a good idea?Cant remove it to charge?How dyou replace a new battery?Would the battery stand up to being bumped around?


oops,the t is too near the r on my keyboard! That of course should read " rear " in the title


chinaqyy.en.alibaba.com/productshowimg/278359295-209543152/Recreation_Electric_bicycle.html

sorry bad day! The link wont work,you'll have to copy and paste it ,sorry

 

[flecc]

The US Tidal Force bikes have long used in-wheel batteries and now that Matra have taken them over, they have continued with that. So it seems satisfactory, but as you say, it does impose unwelcome restrictions. Here's photos of the Tidal Force bike and a Matra prototype that might reach production one day:

 

[keithhazel]

The US Tidal Force bikes have long used in-wheel batteries and now that Matra have taken them over, they have continued with that. So it seems satisfactory, but as you say, it does impose unwelcome restrictions. Here's photos of the Tidal Force bike and a Matra prototype that might reach production one day:

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my first folder was one i bought i think from bob of "alien" in scotland and it had a 36 volt battery also built into the back wheel...

 

[jerrysimon]

I have also seen a short article recently, I think in A2B, about someone looking to build A123 cells into a back wheel.


Regards

Jerry

 

[Lloyd]

Personally I am not a fan of the idea due to rotating weight. Makes a huge difference on ride quality. Plus you will undoubtedly get a gyroscope effect. Also spoke lengths become non standard items, and I am sure standard 14/15g spokes are not going to be up to the extra forces.The only two spokes I know of that would be anywhere near strong enough to cope don't come short enough. Plus that sheer size of hub would mean lacing would be forced to be radial or 1cross at best, meaning less torsion in the spokes so more frequent breakages and a harsh ride. Just my two-penneth for what it's worth!

Regards

Lloyd

 

[Mussels]

Personally I am not a fan of the idea due to rotating weight. Makes a huge difference on ride quality. Plus you will undoubtedly get a gyroscope effect. Also spoke lengths become non standard items, and I am sure standard 14/15g spokes are not going to be up to the extra forces.The only two spokes I know of that would be anywhere near strong enough to cope don't come short enough. Plus that sheer size of hub would mean lacing would be forced to be radial or 1cross at best, meaning less torsion in the spokes so more frequent breakages and a harsh ride. Just my two-penneth for what it's worth!

Regards

Lloyd

That's enough of a problem with normal hub motors, I was unable to find a source of suitable spokes though I think SJS can supply them. Thicker spokes are not necessarily stronger so I think it may take them a while to get it right.

 

[Bigbee]

If you want to change the battery you have to buy a whole new wheel.I think this is a bit of a naff design.Suprising really that they must of gone to huge lengths in R & D to get to where they are.

 

[daniel.weck]

Personally, I think it looks awful Big hubs make an otherwise decent bicycle look hideous, in my eyes anyway.

From a purely technical perspective though, I would like to know how much of the hub is in motion along with the spinning wheel. For example, the BionX hub motor (with integrated controller, but separate battery) is designed so that the heavy parts (e.g. rare magnets) remain static with the bike frame while the wheel rotates.

I am struggling to see the advantages of packing every component in such a critical cramped location...as far as I can tell it adds to the cost of maintenance/repairs/upgrades. The same comments were made on this forum with regards to the "Copenhagen Wheel".

Cheers,Dan

 

[Gepida uk]

Interesting concept, I have not seen anything like this done before, Interesting to know what the handling is like when riding through Tight bends, But I have to agree with Dan it’s got to very expensive to maintain? And a real pain not being able to take a battery indoors to charge.

 

[flecc]

And a real pain not being able to take a battery indoors to charge.

Something I dislike on the Sparta Ion and some Izip models too, where the battery cells are within the frame downtube, as on this Sparta:

 

[Lloyd]

The US Tidal Force bikes have long used in-wheel batteries and now that Matra have taken them over, they have continued with that. So it seems satisfactory, but as you say, it does impose unwelcome restrictions. Here's photos of the Tidal Force bike and a Matra prototype that might reach production one day:

Upon closer inspection, I notice the Matra bike has disc brakes too. Disc brakes and radial spokes go together like corn flakes and cola (not good, for those who have never had cornflakes and cola). A disc rotor that big with radial spokes would just pull the wheel apart over time, and by time I mean probably about 30 miles For the safety of those who ride it I sincerely hope this stays a concept prototype.

Regards

Lloyd

 

[flecc]

That's very true Lloyd, and I'm sure it would never be anything but a concept since it was first shown a couple of years ago. The standard pattern Tidal Force seems ok on the road except for the handling compromises, but it's more about being an expensive fast accelerating 30 mph moped than being a bike.
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