Torque Arms

[Andy1865]

Evening All. A quick question if you please as daft as it may sound, how do i measure up to fit a torque arm please as in diameter?
Thanks.

 

[Nealh]

There are two sizes 12 x 10 or 14 x 10 all in mm. 14 x 10 are normally for the DD hubs.
All my geared hubs are 12 x 10, simply measure the hub axle end.

 

[Andy1865]

There are two sizes 12 x 10 or 14 x 10 all in mm. 14 x 10 are normally for the DD hubs.
All my geared hubs are 12 x 10, simply measure the hub axle end.

Thank you Neal

 

[D C]

If you have a 14mm and a 10mm open ended spanner just see which one fits.

 

[Andy1865]

If you have a 14mm and a 10mm open ended spanner just see which one fits.

Just measured and as far as i can see its 10mm by 8mm

 

[Andy1865]

Thank you Neal

Just measured Neal and as far as i can see its 10mm by 8mm

 

[Benjahmin]

That's small, what motor is it? Got a photo?

 

[Andy1865]

That's small, what motor is it? Got a photo?

Will get you one Benjahmin. Its a 500w 36v ECOTRIC fat tyre bike. You maybe be able to get a better look on their website but will post a photo. I noticed it has a tagged washer either side of the motor. Would these be torque washers to replace torque arms oweing to the axle being such a small size?

 

[Nealh]

The washers are anti rotation washers simply used to keep the motor axle in the correct plain once in the drop outs, very much like the ones you will find on internal geared hubs like Sturmey & Shimano etc. They aren't for resisting motor torque unless you have steel forks and then there's a chance they can snap.

 

[Andy1865]

The washers are anti rotation washers simply used to keep the motor axle in the correct plain once in the drop outs, very much like the ones you will find on internal geared hubs like Sturmey & Shimano etc. They aren't for resisting motor torque unless you have steel forks and then there's a chance they can snap.

Done the magnet test and they are not steel forks, so i suppose next thing is do is to try and find some torque arms small enough to fit the axle

 

[Nealh]

If handy with a drill & file or a Dremmel tool with burr's make your own up (one piece), patience and time one should be able to get a good snug fit. 3mm steel is all I use and I first make an over size one that fits snug then utilise an unused tapped fixing/ drill the T/A so that it aligns with the tapped hole. Once done finally shape the metal to look nicer.

 

[Andy-Mat]

If handy with a drill & file or a Dremmel tool with burr's make your own up (one piece), patience and time one should be able to get a good snug fit. 3mm steel is all I use and I first make an over size one that fits snug then utilise an unused tapped fixing/ drill the T/A so that it aligns with the tapped hole. Once done finally shape the metal to look nicer.

Good Idea, which may for some prove to be very interesting.
If I used that method, I would start with something like 2-6 thick stainless steel washers (depending upon how much space I have available on the threaded axle), file to fit, then have them spot welded together, with an arm that allows them to be secured in place, just as you mentioned.
It would be a really tiny cost, especially if you have yourself or know someone with a welder....
Great DIY idea for some here I feel.
Andy