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Old 07-10-07, 12:55 PM   #1
stokell
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My next e-bike Project

I've been riding my brushless hub on the front wheel of my old Giant since early spring. 48kms a day, without a break. It's been quite reliable, but there are a few things I would like to improve.

The roads in the City of Toronto are pretty bumpy, and I'd like to add front suspension. I also find that when I'm travelling over 30 kms/hr, my brakes are just barely adequate, so I'm thinking front discs also. I have to but the hub on the rear wheel and I'm concerned about balance with both the hub and the battery being on the rear wheel.

If you build up your own bike, do you have suggestions on any improvements to my build?
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Old 07-10-07, 03:05 PM   #2
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Can you move the battery to the middle of the bike? A rear hub motor with rear rack mounted battery should be ok to around 50-60km/h if the rack is solid.
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Old 07-10-07, 07:48 PM   #3
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Quote:
Originally Posted by stokell
I've been riding my brushless hub on the front wheel of my old Giant since early spring. 48kms a day, without a break. It's been quite reliable, but there are a few things I would like to improve.

The roads in the City of Toronto are pretty bumpy, and I'd like to add front suspension. I also find that when I'm travelling over 30 kms/hr, my brakes are just barely adequate, so I'm thinking front discs also. I have to but the hub on the rear wheel and I'm concerned about balance with both the hub and the battery being on the rear wheel.

If you build up your own bike, do you have suggestions on any improvements to my build?
A 5 lb 1500 watt mid drive motor and a 3 speed hub with full suspension.
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Old 07-10-07, 09:58 PM   #4
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Originally Posted by EbikeHawaii
A 5 lb 1500 watt mid drive motor and a 3 speed hub with full suspension.
Do you have such a kit for sale?
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Old 07-11-07, 12:46 PM   #5
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Did I mention that I'm only responding to serious suggestions?
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Old 07-11-07, 01:08 PM   #6
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Why do you have to put the motor in the rear wheel? I'd say put it in the front wheel. The bike will be more stable. For the batteries, place them as low as you can so your center of gravity can be as low as possible.
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Old 07-11-07, 09:06 PM   #7
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Originally Posted by adamtki
Why do you have to put the motor in the rear wheel? I'd say put it in the front wheel. The bike will be more stable. For the batteries, place them as low as you can so your center of gravity can be as low as possible.
Why do you want the center of gravity as low as possible? Also the OP said he wants a disc brake, which means no front hub motor.

Last edited by Lowell_; 07-11-07 at 09:23 PM.
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Old 07-11-07, 10:02 PM   #8
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What Kit has everything you need that works without any fabrication or buying parts and batteries, racks or brackets?
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Old 07-11-07, 10:06 PM   #9
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If you are actually building then diss the hub motor and save about 15 lbs.
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Old 07-11-07, 10:31 PM   #10
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Quote:
Originally Posted by EbikeHawaii
What Kit has everything you need that works without any fabrication or buying parts and batteries, racks or brackets?
http://www.crystalyte.ca/

http://jvbike.com/

http://ebikes.ca/projects.shtml
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Old 07-11-07, 10:32 PM   #11
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If you are actually building then diss the hub motor and save about 15 lbs.
What would you suggest that can be bought off the shelf? FYI, a Crystalyte 40X hub with 26" rim and spokes weighs 15lbs. How much is your proposed motor, sprockets, chain, mounts and hardware going to weigh? The SRAM Dual Drive hub weighs 970g as per the SRAM website.

http://weightweenies.starbike.com/listings.php

Last edited by Lowell_; 07-12-07 at 12:57 AM.
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Old 07-12-07, 05:47 AM   #12
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Can a 3 speed SRAM hub begin to take the torque that a 1500W motor can dish out? Isn't 1500W about three times what someone like Lance Armstrong puts out for torque?
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Old 07-12-07, 02:59 PM   #13
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Can a 3 speed SRAM hub begin to take the torque that a 1500W motor can dish out? Isn't 1500W about three times what someone like Lance Armstrong puts out for torque?
From the numbers Randy has posted, it doesn't sound like he uses full power very often. Riding to achieve the best Wh/km figures will certainly give the gears an easy time. Maybe that's the reason he only posts videos of other peoples bikes doing burnouts.
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Old 07-12-07, 04:59 PM   #14
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Randys bike is a fine bike. If you have the time, handy with tools and manufactering. It will use less electricity, has greater hill climbing ability and higher speed. The downside is it has an apparent motor on it (cop attraction) , and is a bit noisy.
A hub motor is nice too. Although a bit more expensive, and not as effecient. It is easy to install, about an hour and you are ready to go. Looks like a normal bike, very quiet although there are no gears and has a bit of a problem climbing hills, this can be over come with more amps (read more wieght ) or extra peddle power.
Both bikes are excellent alternatives to fossil consuming vehicles.
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Old 07-14-07, 05:37 PM   #15
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Well, you know even cantis in good order will stop a loaded touring bike going downhill. What you're saying suggests your brakes could use some maintenance. My Miyata 600 GT will lock up both wheels if I want it to, it has black EagleII Kool Stops mounted on canti brakes.

And I see you're running cantis, but your front caliper straddle wire looks a little long. I like to see about 90 caliper/straddle wire, and also 90 at the top of the straddle wire. With a longer straddle wire you loose leverage so you have to pull harder on the lever to get the same pad-rim pressure.



Also the tires you're using look rather skinny to me, you could get some front suspension by running fatter tires. I ran 26X2.0 Big Apples on my first ebike until the slush turned to ice, I loved them. They were narrower then mtb 1.9 knobbies, but gave a suspension feeling comparable to the nearly twice wider 2.125 beach cruiser type tires, all while giving a fractional rolling resistance, nearly as good as a road bike. And they never yet got flats, ever *touches wood*. As for the roads here, consider that Quebec accounts for 1/3rd of Canada's suspension repairs. Of course, as usual your comfort level may vary, but somewhat fatter tires could well be all you really want.



In any case, AWD, disks and suspension are compatible. Here is a Phantom, about 1/2kg lighter then your current WE hub, also better on watts, mounted with a tandem disk brake because it needs a bigger disk to clear the hub, the whole mounted on a front suspension fork, with the entire bike including battery weighing in at around 20Kg:

http://www.velectris.com/forum/s897-...m-Lipo36V.html

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Old 07-14-07, 06:07 PM   #16
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disc brakes on a front hub. nice
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Old 07-14-07, 06:27 PM   #17
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Originally Posted by Ghost Rider
Randys bike is a fine bike. If you have the time, handy with tools and manufactering. It will use less electricity, has greater hill climbing ability and higher speed. The downside is it has an apparent motor on it (cop attraction) , and is a bit noisy.
A hub motor is nice too. Although a bit more expensive, and not as effecient. It is easy to install, about an hour and you are ready to go. Looks like a normal bike, very quiet although there are no gears and has a bit of a problem climbing hills, this can be over come with more amps (read more wieght ) or extra peddle power.
Both bikes are excellent alternatives to fossil consuming vehicles.
Good analogy. but my motor can be painted the same color as the frame and it would not be noticed behind the chainwheel.Secondly with the composite sprockets it can not be heard below 20 mph unless you are winding it out to 4000 rpm in first gear.Enen then it is quieter than any ebike system other than a good hub motor and controller.
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Old 07-15-07, 02:46 AM   #18
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The latest batch of Crystalyte motors are fantastically quiet. Where my old X503 would make audible humming at 38km/h, which can be heard on my videos, the latest X5304 is absolutely silent.
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Old 07-17-07, 06:23 AM   #19
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I know that u r asking for people who have actually tried something - I hope this doesn't disappoint. Why not...install a motor with belt/chain to the front wheel...install a gear hub with a few gears? This would not interfere with a common installation for a disk brake and would give you more torque.
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