Torque Arm

[Ronmac]

Hi all
I have joined the newsgroup today and it looks very good and informative so much so that I feel compelled to seek your help so soon , I own two electric bikes , a electric car since 2016 and have un the same year and installed enough solar panels to charge em all , but back to the point in question, my recent acquisition is a diy front wheel convertible which was a dream to install, but since assembling it I discovered that there is a potential problem round the corner in as much as the torque arm kit I purchased looks far to flimsy and is secured with a hose clamp ! can anyone suggest a more secure way of doing it , cheers and thanks in anticipation

Ronnac

 

[AHicks]

Hose clamps are better than nothing, but not as good as a solid bolt mount, assuming that's possible.

 

[Ronmac]

Hmm I have had a trial 10 mile run without any problem but it still looks a little flimsy
Have I fitted it correctly?

thanks

Ronnac

 

[indianajo]

Hose clamps are good for maybe a 5 lb pull. Admittedly in that direction the arm is pressing against the fork, not pulling.
I connect mine with a 3"x1" strip of steel I cut out of a box fan shell. I put a clearance hole in one end and 3 or 4 holes on 3/4" centers on the other end. Then I fold it, secure it to the torque arm with one 10-32x1 1/2" screw. Another screw secures the clamp around the fork. I use elastic stop nuts so they don't constantly come loose. I use stainless steel screws. I spray paint the clamp.
Use safety glasses using power tools. Sharp edges can be filed down or held against a grinding wheel.

 

[Ronmac]

Hose clamps are good for maybe a 5 lb pull. Admittedly in that direction the arm is pressing against the fork, not pulling.
I connect mine with a 3"x1" strip of steel I cut out of a box fan shell. I put a clearance hole in one end and 3 or 4 holes on 3/4" centers on the other end. Then I fold it, secure it to the torque arm with one 10-32x1 1/2" screw. Another screw secures the clamp around the fork. I use elastic stop nuts so they don't constantly come loose. I use stainless steel screws. I spray paint the clamp.
Use safety glasses using power tools. Sharp edges can be filed down or held against a grinding wheel.

It sounds like the type of thing I was imagining , any chance of a photo?

 

[Ronmac]

wow that does not look like what I was talking about with Grin Technologies' clamp.

I think it needs to be supported against the fork like this.
It shouldn't be flimsy.

Torque Arms - Grin Products - Product Info

For every force there is an equal and opposite force, and for every torque there is an equal and opposite torque. Sadly with import hub motors this opposing torque is often born entirely by bicycle dropouts that are not up to the task, allowing the motor axle to spin out. Grin has pioneered the...

ebikes.ca

Yep that looks more solid than my single hose clamp And using the fork to secure the clamp instead of just attaching to the arm , I will take a serious look at getting nearer to the illustration- thanks

 

[indianajo]

It sounds like the type of thing I was imagining , any chance of a photo?

No. Google owns the pictures from my phone. If I give them my name, address, birthdate, ssn, driver's lic #, mother's maiden name, pick a user name & password, I can download them. I don't love their ads that much to personalize them. The avatar was a sports camera, that lasted a year before the battery gave up. ****ese ****.

 

[Ronmac]

No. Google owns the pictures from my phone. If I give them my name, address, birthdate, ssn, driver's lic #, mother's maiden name, pick a user name & password, I can download them. I don't love their ads that much to personalize them. The avatar was a sports camera, that lasted a year before the battery gave up. ****ese ****.

Thanks for the info anyway

 

[zzRider]

Hmm I have had a trial 10 mile run without any problem but it still looks a little flimsy
Have I fitted it correctly?

thanks

Ronnac

You have it mounted incorrectly. See the large picture posted above. I have the same ebikeling mounted on a 1000watt front-hub trike and it works fine.

 

[Ronmac]

You have it mounted incorrectly. See the large picture posted above. I have the same ebikeling mounted on a 1000watt front-hub trike and it works fine.

Thanks , I will correct it tomorrow before I ride it again

 

[PedalUma]

Thanks , I will correct it tomorrow before I ride it again

Can you fit a torque arm on each side? Aluminum forks will snap with fatigue before they bend. It is hard to determine the material from the photo. Distributed force would be safest. On steel forks there would be torque steer when one side gets the brunt. I finally got rid of a front hub motor that had taken up residence for ages. And I sold the guy a huge battery that I will never use. This is the bike he rode in on. It is chromoly and I do not see a torque arm.

 

[indianajo]

On steel forks there would be torque steer when one side gets the brunt.

I have a 500 W high torque Mac12t on the front, and I don't have torque steer. I have one torque arm on the right. I don't power across muddy steel, wet rock, or wet wood bridge decks. I pedal or push across those slip hazards.

 

[Ronmac]

Thanks for that info I will be very careful when I apply the power on my 500w bike to avoid possible spin on the motor axle

 

[zzRider]

Thanks for that info I will be very careful when I apply the power on my 500w bike to avoid possible spin on the motor axle

500w isn't enough power to twist or spin and cause damage, unless you have a really weak front fork. Ride fast and enjoy!