MaximilianMM
1 W
- Joined
- Aug 23, 2021
- Messages
- 64
Hi there,
First time poster - I've started building my first e bike conversion. It's a 48V 1000W rear hub on a Genesis Equilibrium disc road bike.
I'm nearly done, but the rear fork axle/dropout/torque arm vortex is proving to be challenging. An early test ride led to the realisation that the wheel was nowhere near secure enough, as it span out, gently and without damage thankfully.
I now realise that I need to file to dropout so that the axle fits better and deeper. And that I need a better torque arm, probably on both sides, than the crappy Grin v1 knock off I got.
My question is regarding the torque arm.
If I can find a solution secured via the spare eyelet on my rear forks (or even onto the disc caliper mount?), is that going to be more secure than any hose clamp solution (assuming the bolt is good quality)?
This kind of custom thing is what I'm looking at: https://endless-sphere.com/forums/download/file.php?id=242141
The above actually seems to be pretty similar to the Grin v2: https://ebikes.ca/product-info/grin-products/torque-arms.html
Maybe I could just use that?! But it says it's designed for front forks so I'm not sure if it's a good idea.
Finally, I understand and have read that for optimal resistance you want the direction of motor torque rotation to be pushing against the frame, rather than relying on the hose clamps to pull it back, as they're weaker. So presumably bolts lose some of the benefit of a clamped solution, which places the arm underneath the stay, as the force is transferred to the bolt?
But then again, clamps seem to be fairly unreliable vs a bolt to me, but maybe I'm wrong. I'm not sure how to assess that trade off.
As you can tell, I'm a bit overwhelmed with options and information.
Thanks in advance, I really appreciate any advice.
First time poster - I've started building my first e bike conversion. It's a 48V 1000W rear hub on a Genesis Equilibrium disc road bike.
I'm nearly done, but the rear fork axle/dropout/torque arm vortex is proving to be challenging. An early test ride led to the realisation that the wheel was nowhere near secure enough, as it span out, gently and without damage thankfully.
I now realise that I need to file to dropout so that the axle fits better and deeper. And that I need a better torque arm, probably on both sides, than the crappy Grin v1 knock off I got.
My question is regarding the torque arm.
If I can find a solution secured via the spare eyelet on my rear forks (or even onto the disc caliper mount?), is that going to be more secure than any hose clamp solution (assuming the bolt is good quality)?
This kind of custom thing is what I'm looking at: https://endless-sphere.com/forums/download/file.php?id=242141
The above actually seems to be pretty similar to the Grin v2: https://ebikes.ca/product-info/grin-products/torque-arms.html
Maybe I could just use that?! But it says it's designed for front forks so I'm not sure if it's a good idea.
Finally, I understand and have read that for optimal resistance you want the direction of motor torque rotation to be pushing against the frame, rather than relying on the hose clamps to pull it back, as they're weaker. So presumably bolts lose some of the benefit of a clamped solution, which places the arm underneath the stay, as the force is transferred to the bolt?
But then again, clamps seem to be fairly unreliable vs a bolt to me, but maybe I'm wrong. I'm not sure how to assess that trade off.
As you can tell, I'm a bit overwhelmed with options and information.
Thanks in advance, I really appreciate any advice.