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Old 04-21-10, 01:43 PM   #1
bmt074
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Building an Electric Bike

So I am building a new electric bike. I am planning on getting a front-drive kit from Amped. The idea is that I am going to get a Townie comfort bike and then apply the kit to it. From what I understand Aluminum forks aren't the best for front-drive motors (I actually witnessed one get completely bent out of shape after hitting a fairly nasty bump).

What replacement forks would people recommend for use with a front-drive motor? Are there any shock absorbing forks that would be strong enough to handle the motor?
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Old 04-21-10, 01:50 PM   #2
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Originally Posted by bmt074 View Post
So I am building a new electric bike. I am planning on getting a front-drive kit from Amped. The idea is that I am going to get a Townie comfort bike and then apply the kit to it. From what I understand Aluminum forks aren't the best for front-drive motors (I actually witnessed one get completely bent out of shape after hitting a fairly nasty bump).

What replacement forks would people recommend for use with a front-drive motor? Are there any shock absorbing forks that would be strong enough to handle the motor?
Make sure it's steel and use torque arms too. There's a member over at the Endless Sphere forums that has a photo in his signature of a bike rider's nose and face hitting his motorized front wheel when his fork broke. It's extremely painful to look at; you don't want that happening to you.
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Old 04-21-10, 05:05 PM   #3
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I second the steel and torque arms. You might want to look into getting a different bike rather than buying one and having to replace the fork.
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Old 04-22-10, 10:44 AM   #4
bmt074
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Thanks for the replies! I am going to make sure that the bike is suitable for the engine.

Is this a non-issue with rear wheel motors? Now I am thinking of getting a new hybrid and converting my old 7.2fx. The 7.2fx is also made of aluminum - could it manage a motor on the rear wheel?
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Old 04-22-10, 06:18 PM   #5
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I can attest - my Norco seems to be all aluminum. I run a rear hub motor and have definitely not had a problem.

I did limit the beastie to a max 30A draw and torqued the rear nuts down well. I did not install torque arms, and I carry the batteries in panniers off the back. I do imagine there is some stress on the farme, but so far no issues with it.

BTW guys - I ordered 2 * CellLog 8 today.... 40Ah cells maybe tomorrow....
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