Torque Arm Upgrade

[diverdon]

 
     Hello , Seems like forever since I have even had anything to ask about .. The 1000 watt Magic Pie Front motor has been working perfectly .. Finally after I don't know how long 1-2 years .. I noticed little clunk sometimes when I braked or gave it some power ..  Sure enough the Right side axle nut had backed off a little .. I had it double nutted and marked so I could see if it moved ...
      I retightened it for sure over the torque spec but being careful as the threads on the motor shaft don't go all the way around "weak?" .. So I double nutted it again .. used some locktite this time ..
     I am using a Grin Tech Torque Arm .. 1 on each side .. Has anything better than them come out ? One of them seemed to fit the axle better than the other .. I wish there was a "file to fit version" .. Anyhow probally worried about nothing .. I ride this bike at least an Hour allmost every day ... Thanks for you Time and help ..

[Bikemad]

Hi Don,

The Grin Tech torque arms should be fine as long as everything is tightened up sufficiently.

All my converted bikes have steel dropouts and I have never used torque arms. On my High Power Magic Pie I used longer modified car wheel nuts to ensure that the threads did not strip when tightened really snug.

If both of your axle nuts were done up to ~80Nm (59 ft/lbs) before adding the additional locking nuts then the axle should not be able to twist within the dropouts.

Alan
 

[diverdon]

   
  Thanks Alan ...
     
      I have the Grin one that bolts directly to the fender threaded part ... I read where you said (I think) that those don't spread out the torque as well as the ones with the long arms and hose clamps ..
      I dug this extra arm out from and older torque arm and added it to the Grin one I'm using ... Now it's attached in 2 places ..
      I also made "witness marks" so I can see if it moves easily .. It's been way over a year since I've tightened it up .. Saw the new Grin one 65 or  85 bucks I forget .. Don't think I need it that bad ..
        The Lug Nut Idea is Interesting .. Like to hear more about that ..
     Here's a Picture of what I've done .. If it goes thru ... Thanks Again for all your help ... Don ..

[diverdon]

Hi Don,

The Grin Tech torque arms should be fine as long as everything is tightened up sufficiently.

All my converted bikes have steel dropouts and I have never used torque arms. On my High Power Magic Pie I used longer modified car wheel nuts to ensure that the threads did not strip when tightened really snug.

If both of your axle nuts were done up to ~80Nm (59 ft/lbs) before adding the additional locking nuts then the axle should not be able to twist within the dropouts.

Alan

       I'd sure like forks with nice thick steel dropouts ... How would I go about finding or ordering something like that if you don't mind ... The Lawyer Lips and thin fork legs have allways concerned me   .. Their made of steel .. the frames Aluminum .. It's all lasted this long so there's no hurry .. but if I could upgrade that part it would be great ...   Thanks Again .. And "Happy New Year" ...