ebike torque arm placement

[dimpirate]

Hey guys, I need to make sure I'm putting these torque arms on right! Not ideal I have to add extra nut for arm on axle, and the angle looks a bit iffy to me. What do you think? Will this work, I am going to be using two tourque arms. There will be quite a bit of power to setup, 18S4P with HS3540 and i will be using regen.

Any help, advice much appreciated
Thanks

 

[Drunkskunk]

Looks basically fine, but you could improve it by getting rid of the hose clamp and second arm, and using a coaster brake strap on the primary arm. Its a strap that goes around the bottom chain stay and would attach where the bolt is now. Any bike shop should have them.


http://budgetbicyclectr.com/vintage...ake-arm-strap-no-6003-by-wald-for-sale-online

 

[dimpirate]

Looks basically fine, but you could improve it by getting rid of the hose clamp and second arm, and using a coaster brake strap on the primary arm. Its a strap that goes around the bottom chain stay and would attach where the bolt is now. Any bike shop should have them.


http://budgetbicyclectr.com/vintage...ake-arm-strap-no-6003-by-wald-for-sale-online

Thanks for the reply drunk skunk!
dont know how well the strap would work by itself on bottom chainstay, because the gap is pretty big beetween tourque arm and chainstay (shown in picture below) aproximately 7 mm.
I could also leave hose clamp and second arm on and use together with strap for exra security, sould work.

I see you have torque arm on inside of dropouts, i was kind of afraid to do so to not widen dropouts to much....
do you think this works better, i wouldnt have to use extra bolt in that case and might be easier to get better angle.
going with 2 torque arms im afraid approximately 8mm extra on inside of dropout might be to much, does it matter.....?
ill be using nordlock washers as well so it should up my safety factor.

 

[neptronix]

In your situation, i would remove the second section of the torque arm, and just clamp the thing down to the frame with 2-3 clamps if possible..

That bolt connecting the two sections could very well come loose and suddenly the torque arm is worthless. That doesn't inspire confidence in me, not on what looks like a Crystalyte HS/HT.

 

[Drunkskunk]

That wasn't a picture of my bike, just a random google find of the strap being used. its a coaster brake so it's on the inside, but the bracket is universal, so it will fit a torque arm on the outside.

The gap you have should be fine to use with the torque arm and strap, but you would be better off with 1 nut and some washers to get the spacing better.

 

[dogman dan]

I have to disagree this time. That is not fine at all. But I agree with DS, that a clamp on the chainstay would improve it a lot

First, though that is a great torque arm, it was designed as a universal front fork torque arm. So you may need to modify it slightly to get a good install on this particular bike.

Here is what I see as a problem. The way that second piece is attached, and the way the clamp is attached to the seat stay is liable to slip up or down and still allow some movement of the axle.

But happily, I see a fairly easy fix. Rotate the second piece of the arm downward, till it has a good angle to attach to the chainstay, then drill a hole so a second bolt can be attached, making the torque arm longer and then clamp to the chainstay.

If a good angle can't be done, then make a steel piece that can be put on at the right angle, from some flat bar stock.

 

[dimpirate]

Thanks for the advice guys!!! So here is my plan
First of all This is a great torque arm just not for my intended use. I thought of going to chain stay like you all suggested with main torque arm and add secondary arm like dogman says to do and clamp the hell out of them.
This would work completely, but....
After a little more looking into doctorbass's Torque arm, I realize these would be a more ideal install and even at way more security!!
Sent e-mail to Doc, will be purchasing those.
The 2 sets of ebike style universal front fork arms I have are still both brand new, so I will be posting a sales post to sell to someone who can make better use.

Thanks again
Fred

 

[dogman dan]

The Dr Bass torque plates look like they kick ass to me. He's always coming up with great ideas.

Best torque plate I've seen yet though, is the removable dropouts for some bikes. Replace the whole removable piece with a big chunk of thick metal, with your choice of approach, pinch, notch, ot flat sided holes. Cool thing about those is you can lengthen the weelbase at the same time. Too bad all bikes don't have the bolt on dropouts.

 

[dimpirate]

Yea I actually was reading a link earlier about a bike like that. Ahhhhh just one more of the things I wish I would have known before buying my bike ..... Oh well, next time