Scott E-bike ...

[berkeleydb]

Saw this Scott E-bike at RR Cycles Madiwala --
https://photos.app.goo.gl/yBt65cqqBsG7qZKs1 (see most recent pics.)

Did a test ride... pretty nice. Has 3 levels of power assist.

Price tag -- ₹2.55L. (Battery included. :P)

-{db}.

[Alex J V]

nice ... expensive.. but its a good trend.. electric cycles has its place, I feel. 

From the pictures, it looks like the motor is housed within the frame(directly with the crank). That explains the price. This will give real good weight balance but puts a lot of load on the chain than usual. 

I am playing with the electric conversion kits from eaddict(front wheel motor) and limitless(rear wheel motor). They are damn good for the price. 

Alex

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Alex J V

@alexjv89

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[M S Sriram]

Alex- The motor drives/ assists the cranks in sync with the pedalling by the rider. the chain is the secondary/ final drive and is like an ordinary bicycle . the whole e bike working is only limited to the battery pack and motor which " assists" the cranks.  There is no special/additional load on the chain in an E Bike. 

[berkeleydb]

Ya, it is a pedal-assist bike. Not sure if it will put additional stress on the chain. I doubt.

Alex -- interesting to know you are experimenting with e-bike mechanisms.

-{db}.

[Chidambaran Subramanian]

How do you recharge the battery?

-{db}.

[M S Sriram]

Just like  a cellphone.. connect it to  a power socket, bike comes supplied with a charging cord and plug. Takes 3-4 hours for a 100% charge

[Alex J V]

Here is a good video explaining the advantage/disadvantage between mid drive / hub drive(front/back) - https://www.highlyreco.com/u/alexjv89/review/6482

>There is no special/additional load on the chain in an E Bike.

In the same video at 5m 29sec , the person explains the biggest issue with mid drive - chain snapping. It seems the torque profile of human power and motor power are not similar and it affects the life of the chain. I am sure people will figure out appropriate mitigation mechanisms. 

Alex

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Alex J V

@alexjv89

Recommendations from domain experts - www.highlyreco.com

[Vaibhav Fadnavis]

@ Alex - How has your experience been with the front wheel  motor from eaddict. I use a rear wheel one from hulikkal. While I have no problems with the electric kit (almost flawless performance) , does make it harder to get basic maintence done from neighbourhood cycle store guys. Was hoping front wheel will take care as it can separate the gear train from the electric assembly. What has been your experience?

Regards, Vaibhav

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[Alex J V]

@vaibhav, 

The weight on the front hub has some noticeable problems and some benefits

Noticeable problems:

- moment of inertia on the front wheel is more. You will find it noticeable different to use the steering. A rotating mass has gyroscoping effects. So when you try to turn the handle bar, you will feel gyroscopic force in addition to centrifugal force particularly at higher speeds. its a little wierd in the beginning but I think you will get used to it. You will learn to compensate for it. Royal enfield thunderbird(cruisor) has larger caster angle than regular bikes. the handlebar response feels similar to having large castor angle. You feel like you are riding a slighly sluggish steering bike. 

- heavy front wheel means you will do less of bunny hopping, picking up the front wheel for getting on the sidewalk during traffic is a little pain. You tend to think slightly more like a person on a motor cycle than on a bicycle. You might find yourself thinking twice about getting on the curb. 

- if you have front suspension, its not recommended to use front hub motors more powerful than 500W. Reason - regular suspensions are not design to handle torque from a front wheel hub motor. So there is a chance of catastrophic failure (very small but chance exists.. you could argue that front brakes also apply torque on the suspension). Fortunately, all hub motors sold in india are 350W or under. Most of them 250W. 

Advantage

- swapping wheel with a regular wheel is a little less complex than rear hub. But it is not quick release. 

- retrofit is far simpler.

I think I would prefer a rear wheel bike as I dont mind the complexity and would appreciate the better steering response and weight profile. caveat - I have not got enough time on a read wheel powered bike. 

 

Hope that helps

Alex

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Alex J V

@alexjv89

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[Alex J V]

@vaibhav - what part of bangalore do you stay? Can I try out your rear hub bike?

Alex

ᐧ

Alex J V

@alexjv89

Recommendations from domain experts - www.highlyreco.com

[Vaibhav Fadnavis]

Sure ...I stay at Thubarhalli near VIBGYOR school. You can come over the weekend

[berkeleydb]

Saw the hybrid (vs MTB) version as well at RR Cycles... Looks quite good.

-{db}.