Torque Arm for Sturmey Archer IGH?
- Thread starter howlndog
- Start date
Could you post a pic of how much axle is available to attach something to? A pic would also show any parts nearby that might conflict with a DIY torque-arm.
Sunder
10 MW
I can't tell for sure from the picture, but does it look to anyone else that the axle is too small for the fork end? If it was, no wonder you broke the bolt.
But like I said, I can't see enough to be sure that's the case.
But like I said, I can't see enough to be sure that's the case.
You could order something to be water-jetted, or laser-cut. If making a torque-arm yourself, I have found its "easy enough" to hacksaw cut aluminum, or maybe use a thin abrasive wheel on an angle-grinder to shape a steel plate? (Wear eye protection) Drill a hole where the axle will go in the plate, then cut a slot out
You might find some ideas in the big torque arm thread:
https://endless-sphere.com/forums/viewtopic.php?f=2&t=26444
You might find some ideas in the big torque arm thread:
https://endless-sphere.com/forums/viewtopic.php?f=2&t=26444
MadRhino
100 GW
I would make 2 torque plates . On the right side, I would make it one piece integrating the tensioner hanger. On the left, I would make it to attach to the brake mount.
Hillhater
100 TW
Why would an IGH need a torque arm ?
Its torque reaction is against the chain .
...and yes, that axle looks too small for the drop outs.
Its torque reaction is against the chain .
...and yes, that axle looks too small for the drop outs.
Mundo
100 W
I don't know the size of your drop outs. but most IGHs axles are smaller than the many drop outs. Perhaps they've opened up as well?!
Check out these adapters towards the bottom of the page, might help in coming up with a solution. All these designs are for a Yuba Mundo, but you'll get the idea.
http://yubabikes.com/product-category/parts
Check out these adapters towards the bottom of the page, might help in coming up with a solution. All these designs are for a Yuba Mundo, but you'll get the idea.
http://yubabikes.com/product-category/parts
Sunder
10 MW
Most axles are 9 or 10mm (or their equivalent imperial size). I suspect most parts manufacturers make them just universally in 9mm size, so that they fit perfectly in 9mm dropouts, and are "close enough" for 10mm dropouts.
Recently, I've heard about 12, 15 and 20mm dropouts for mountain bikes for increased strength and stiffness. There's no way that a 9mm axle won't spin out in there.
Any torque arm you install in a case like that, is just going to be masking the problem - and I suspect not all that well.
Probably best to get an adaptor as Mundo mentioned, or get the right sized IGH.
Recently, I've heard about 12, 15 and 20mm dropouts for mountain bikes for increased strength and stiffness. There's no way that a 9mm axle won't spin out in there.
Any torque arm you install in a case like that, is just going to be masking the problem - and I suspect not all that well.
Probably best to get an adaptor as Mundo mentioned, or get the right sized IGH.
And against the frame via the axle, depending on what gear it's in.Hillhater said:
http://www.sheldonbrown.com/twist-internal.html
(interestingly, the pic the OP used is not of his own parts, but is actually a link to the picture on the page above)
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