Any ideas for best conversion kit

[Peter.Bridge]

My friend asked if I could convert this for his wife





Any ideas ? She's very light 60 kg, bike is 11 kg, reasonably flat terrain that they cycle on

Any thoughts ?

 

[saneagle]

My friend asked if I could convert this for his wife

View attachment 62281
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View attachment 62283

Any ideas ? She's very light 60 kg, bike is 11 kg, reasonably flat terrain that they cycle on

Any thoughts ?

I did one of those for The Gadget Show, and Jason won the challenge on it - by a lot. Mine had a rear cassette motor and downtube battery. There are mamy choices for conversion kits depending on your budget. I'd avoid a front motor. If she wants it for commuting to work, stick to a rear motor. If she wants light-weight, there are a few options. You need to give us a few requirements if you want specific advice.

 

[Peter.Bridge]

I was thinking rear cassette and down tube battery, she had a Pendleton e-bike but she found it a bit heavy and clunky, so I was thinking something a bit more lightweight. I think 36v would be fine. What rear motor did you use ?

ETA

"Yes Peter, I have the bike it came yesterday, far better than expected. Looking for a conversation for speed and longevity, quality rather than cheap "

I did explain the UK law to them !

 

[Nealh]

Make sure a KT system is used, 17a with AKM100 CST or TBK100AD CST .
Both light at 2.1kg.

 

[saneagle]

I was thinking rear cassette and down tube battery, she had a Pendleton e-bike but she found it a bit heavy and clunky, so I was thinking something a bit more lightweight. I think 36v would be fine. What rear motor did you use ?

I used a Bafang CST. It was actually part of an Oxydrive kit. It was quite big and powerful. If she wants something light, A Q100C with a KT controller and a small Aliexpress bottle battery.

 

[Peter.Bridge]

High Torque Hight Speed Motor TBK-100H 36V 350W Ebike Front 100mm Rear 138mm Gear Hub Motor 36H 9pins Motor Cable - AliExpress 18

Smarter Shopping, Better Living! Aliexpress.com

a.aliexpress.com

I had a conversation with tbk





That wheel size sounds wrong ? should it be 622 mm ?

I could find somewhere in the UK to build the wheel ?

 

[guerney]

I could find somewhere in the UK to build the wheel ?

@PC2017 found this motor wheel building dude dude:

https://www.pedelecs.co.uk/forum/threads/29er-mxus-xf07-wheel-build-good-idea-bad-idea.47991/page-2#post-734760

 

[Peter.Bridge]

@PC2017 found this motor wheel building dude dude:

https://www.pedelecs.co.uk/forum/threads/29er-mxus-xf07-wheel-build-good-idea-bad-idea.47991/page-2#post-734760

Just contacted Arrow Wheels

"Hi Peter,

Yes shouldn't be a problem, if it has the same number of spokes as your existing wheel the would be able to use the rim from that bike or supply a new rim if needed.
Rims are around £40.00
Labour £45.00
Sapim 13g stainless spokes and nipples £22.00
Return post £10.00"

 

[Sturmey]

pswpower now has motor only akm 100 from Germany for £71 including delivery.

electrical bicycle E-bike Motor AKM 100SX Inner Rotor Motor 36V 350W High Speed Brushless Gear Hub Motor Front Rear cassette Wheel Drive

electrical bicycle E-bike Motor AKM 100SX Inner Rotor Motor 36V 350W High Speed Brushless Gear Hub Motor Front Rear cassette Wheel Drive

www.pswpower.com

 

[guerney]

When I've toyed with the possibility of going KT controller controlled with a hub motor from TBK or PSW for my 26" wheeled Dahon folder, I've been put off by "350W" labelling or engraving on the motor. Custom label is a fix I suppose. My BBS01B is engraved "250W", and is furthermore labelled in authentic Chingrish, which confirms it's authenticity beyond question.

https://www.ebay.co.uk/itm/285385143084?var=587287817778

 

[harrys]

Nice bike.

I've built three hub motor bikes for my wife, and she's ridden over 11000 miles on then, but her favored bike for the past 2500 miles is a 26" bike with a TSDZ2B mid drive.

For me, the mid drive kit is less money than spoking a q128H (AKM128) motor into a custom rim. I still have to buy a controller/display too. Hiwever the Q128H or 100H is a stronger motor with a 20A controller (48V). Still, her TSDZ2B configured with OSF firmware and running in cadence mode is a very easy bike to pedal, unlike the torque sensing mode. Runs effortlessly to 20 mph when I ride it. Tradeoff is how long will it last? We'll see.

 

[Peter.Bridge]

Anybody tried this - seems to have pas sensor and controller built in ?

2.15KG TBK-100ADK CST Cassette 36V250W Motor+Innner Controller and Speed Sensor [TBK-100ADK CST Motor] - $179.00 : Zen Cart!, The Art of E-commerce

Zen Cart! 2.15KG TBK-100ADK CST Cassette 36V250W Motor+Innner Controller and Speed Sensor [TBK-100ADK CST Motor] - ★★★★★ 2.15KG TBK-100ADK CST Cassette 36V250W Motor+Innner Controller and Speed Sensor Specification: 1. Voltage: 36V250W 2. Brake type: Disc brake 3. Connector...

www.topbikekit.com

 

[guerney]

Anybody tried this - seems to have pas sensor and controller built in ?

2.15KG TBK-100ADK CST Cassette 36V250W Motor+Innner Controller and Speed Sensor [TBK-100ADK CST Motor] - $179.00 : Zen Cart!, The Art of E-commerce

Zen Cart! 2.15KG TBK-100ADK CST Cassette 36V250W Motor+Innner Controller and Speed Sensor [TBK-100ADK CST Motor] - ★★★★★ 2.15KG TBK-100ADK CST Cassette 36V250W Motor+Innner Controller and Speed Sensor Specification: 1. Voltage: 36V250W 2. Brake type: Disc brake 3. Connector...

www.topbikekit.com

It's gonna get hot in there. Do they sell spare controllers and provide instructions for controller replacement?

 

[Nealh]

Much the same as the dearer Keyde offerings , one has to wonder how reliable the inner controller will be in such a small space as well as the heat retension.
280rpm is the only speed offering at lest the Keyde offering has three rpm offerings.

Are you going to be the forum guinea pig on this one Peter ?

 

[Peter.Bridge]

Much the same as the dearer Keyde offerings , one has to wonder how reliable the inner controller will be in such a small space as well as the heat retension.
280rpm is the only speed offering at lest the Keyde offering has three rpm offerings.

Are you going to be the forum guinea pig on this one Peter ?

If it was for me I would have given it a try, but it's for someone else so I think I'll play safe !

 

[saneagle]

It's similar to the Keyde, which was quite expensive and not very reliable. I tried one. It had an internal temperature sensor that cut down the power if it got too warm. Unfortunately, it did it on every hill: Just when you needed the most power, it cut it right down, leaving you struggling.

So far, every hub-motor with internal controller and/or battery seems to have had more than its fair share of problems, then it gets worse because spares are difficult to get and repairs are difficult. The idea of putting those modules close together is fundamentally flawed, since they all make heat in a small spaces that it has difficulty escaping from. I can't see any forced cooling in that motor, which is what it would need.

Finally, the cassette spline is only 21mm. A normal one is about 35mm. They say it can go up to 7-speed, but that sounds a bit optimistic to me.