03-10-12, 06:29 AM
To Lawrence
There's no way in God's sweet mother earth that the nut can come undone given the fact its tightened up and has a tab washer on it, unless something causes it to move repeatedly on the threads.
A 12mm nut presumably has more threads in contact with the shaft than the original nut.
Therefore there should be more frictional resistance between the threads and the shaft than was previously the case.
Neverthelss the issue cannot be the size of the nut, it has be what is causing the nut to loosen.
And from everything I've read I reckon its sprocket chatter.
The sprocket is fractionally too small for the shaft, or the splines of the shaft are fractionally too small for the sprocket.
If the frictional resistance between the nut and the sprocket is greater than between the nut and the shaft (via the threads) and you have a small amount of movement in the sprocket, it will move the nut continually on the threads as you put the bike on and off load .
Ultimately the threads on the nut (because its softer than the shaft which is likely hardened) will wear out.
The end product is the nut wears out and comes loose.
Look at the nut, it's recessed where it tightens to the sprocket.
Why put a recess in it?
Unless it's there to lessen the frictional resistance between the nut and the sprocket (less contact area).
Up to press everything I've read points to the issue of sprocket chatter and the nut being tightened against the sprocket.
Hence the proposed remedy of tightening the nut against the shaft as opposed to the sprocket.
The only thing that f***ing nut has to do is keep the sprocket on. And something is causing it to loosen when it shouldn't.
I reckon it's sprocket chatter and the nut being very tight against the sprocket.
If memory serves: on the old hondas the nut never tightened against the sprocket.
There's no way in God's sweet mother earth that the nut can come undone given the fact its tightened up and has a tab washer on it, unless something causes it to move repeatedly on the threads.
A 12mm nut presumably has more threads in contact with the shaft than the original nut.
Therefore there should be more frictional resistance between the threads and the shaft than was previously the case.
Neverthelss the issue cannot be the size of the nut, it has be what is causing the nut to loosen.
And from everything I've read I reckon its sprocket chatter.
The sprocket is fractionally too small for the shaft, or the splines of the shaft are fractionally too small for the sprocket.
If the frictional resistance between the nut and the sprocket is greater than between the nut and the shaft (via the threads) and you have a small amount of movement in the sprocket, it will move the nut continually on the threads as you put the bike on and off load .
Ultimately the threads on the nut (because its softer than the shaft which is likely hardened) will wear out.
The end product is the nut wears out and comes loose.
Look at the nut, it's recessed where it tightens to the sprocket.
Why put a recess in it?
Unless it's there to lessen the frictional resistance between the nut and the sprocket (less contact area).
Up to press everything I've read points to the issue of sprocket chatter and the nut being tightened against the sprocket.
Hence the proposed remedy of tightening the nut against the shaft as opposed to the sprocket.
The only thing that f***ing nut has to do is keep the sprocket on. And something is causing it to loosen when it shouldn't.
I reckon it's sprocket chatter and the nut being very tight against the sprocket.
If memory serves: on the old hondas the nut never tightened against the sprocket.