Cheap eBay crank drive kit

[morphix]

£160! I wonder if it's any good?



New product 36V 250W electric bike kit crank drive mid mount can change gears | eBay

 

[catsnapper]

It looks like the GNG kit....250W (Brushed) I think I read that someone in the UK was importing a batch of them, maybe this is the guy.

Alan

 

[neptune]

I know of a local guy who uses one of these for commuting, and he says it is brilliant!

 

[morphix]

he also sells a built 20" folding bike with the mid crank drive and battery for 399, hes gonna put tesco out of biz!

 

[Deleted member 4366]

That kit's not really suitable for a folder unless you want to go slow or throttle only because the front chainwheel is too small - as Old_Dave found out. It would be better on a larger-wheeled bike.

 

[Old_Dave]

Yep.. The reduced sized chainwheel that's supplied in the kit (and it has to be that size to allow clearance of the motor drive cog) isn't right.

I'll get around to doing some sums and see if changing to a freewheel set with a 12t will make enough difference to restore the status quo.. But I"m kinda busy spending my winter fuel money on build number 2 and Lipos at the mo, lol


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[morphix]

That kit's not really suitable for a folder unless you want to go slow or throttle only because the front chainwheel is too small - as Old_Dave found out. It would be better on a larger-wheeled bike.

Glad you said that, I was looking at that kit overnight and thinking to myself, hmmm maybe that is a better option for my Mezzo to avoid messing up the gears. I think I will stick to original plan. Also I'm not keen on how it looks anyway the crank drive.. I know professional ones look better though as they're more "integrated" into the design of the bike.

 

[morphix]

Yep.. The reduced sized chainwheel that's supplied in the kit (and it has to be that size to allow clearance of the motor drive cog) isn't right.

I'll get around to doing some sums and see if changing to a freewheel set with a 12t will make enough difference to restore the status quo.. But I"m kinda busy spending my winter fuel money on build number 2 and Lipos at the mo, lol


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Interesting.. that guy on eBay who sells them made a couple of videos demonstrating how easy the gears change and how powerful the crank drive is..it looked like a motorbike! But I think he was using the 48V 400W system he also sells.

 

[morphix]

It looks like the GNG kit....250W (Brushed) I think I read that someone in the UK was importing a batch of them, maybe this is the guy.

Alan

I noticed on eBay he does confirm that kit is brushed the £160 one.. but he also sells a more expensive kit with a bottle battery for £360 which uses an brushless crank motor. Brushed kits won't last as long eh, but you might be able to service it if you know how?

 

[Deleted member 4366]

It'll have good acceleration and hill-climbing ability because of the low gearing. It'll probably go quite fast as a moped, but if you want to pedal, I'd guess about 12mph before your legs start to get uncomfortable. There's nothing to stop you fitting an 11T DNP freewheel or a new wheel with cassette, which could get your comfortable pedalling up to about 15mph. It looks like only 38T on the chain-wheel.

 

[Old_Dave]

Correct Dave, I can confirm that it is a 38t thats supplied in the GNG kit


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[eddieo]

but aren't washing machine motors really fast...mine is on spin cycle

 

[Deleted member 4366]

but aren't washing machine motors really fast...mine is on spin cycle

The problemwith that bike is that the motor is too fast.

 

[eddieo]

The problemwith that bike is that the motor is too fast.

been thinking more about this... and now very worried! what about the wash cycle!!! backwards, forwards ..backwards, forwards...would never get anywhere!

 

[flecc]

been thinking more about this... and now very worried! what about the wash cycle!!! backwards, forwards ..backwards, forwards...would never get anywhere!

Never seen a rowing bike Eddie? They are sometimes used by people with leg disabilities and covered by VeloVision magazine. There's also treadle operated bikes, sometimes appearing in Germany.

 

[neptune]

My first successful electric bike was powered by a washing machine motor. Actually it was a trike. The motor was a DC permanent magnet motor by Phillips. It was big and heavy, about the size of the old car dynamos. It was designed to run at 24V on wash, and 220V on spin. I used to run it on 36V, or occasionally 48V. I used it on journeys of up to 35 miles.

 

[RobF]

was powered by a washing machine motor.

As was the Sinclair C5, which is hardly a recommendation.

Although most people were too busy laughing at the rest of it to worry about the motor.

 

[flecc]

As was the Sinclair C5, which is hardly a recommendation.

Although most people were too busy laughing at the rest of it to worry about the motor.

That was the myth, but of course it wasn't true, it only came into folklore due to Hoover being the manufacturer contracted to produce the C5. The motor units were made by Polymotor of Italy.

 

[neptune]

I am not saying that my washing machine powered trike was brilliant, but it was built from junk on a zero budget, and was of the first in town. That was 14 years ago, and people still remember seeing me on it.

 

[flecc]

I am not saying that my washing machine powered trike was brilliant, but it was built from junk on a zero budget, and was of the first in town. That was 14 years ago, and people still remember seeing me on it.

Back in the 1980s and '90s, most industry produced e-bikes looked like home made ones anyway. It wasn't until 1999 that the UK market saw the start of a higher standard from the majority of manufacturers.