Technical > Bike Problems/Questions

XBR500 lock tabs

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JOOLZ:
Thanks Bill for the information, very handy to know, I will order some new nuts for the sprocket

themoudie:
Aye Joolz, my pleasure.

Good health, Bill

richardeblack:
This is very interesting as none of my XBRs have had tab washers.  Just flange nuts which I assume are aerotight locking ones.  I have always just reused them after a good clean and loctite.  I've never had one come loose in some 200,000 plus miles but am now a little bothered.
Should I replace the nuts each time I fit a sprocket?
There are plenty of M10 flange nuts and M10 aerotight nuts about but, as you say Bill, flanged aerotight ones are not readily available. Should they be high tensile nuts? Would aerotight nuts with washers be ok?
Thanks Bill for all the information and your suggestions.
Richard.

themoudie:
Aye Richard,

Dinnae fret!  ;)

Some might advise new nuts every time that the sprocket is renewed, but that is a bit of overkill in my somewhat curmudgeonly thought process. The nuts just retain the sprocket on the studs, it is the studs that require the strength. So, high tensile nuts? No harm, but not really necessary. After about 50 tightening cycles, the threads and the gap between the nut locking rings, will increase, reducing the locking effect. Have a look at the two graphs attached, one for M6 and another for M8 aerotight nuts and see why, personally, I am relaxed about renewing intervals for aerotight nuts. If you take the point at which the 50% proof load line is crossed as the locking rings loose their efficacy, you'll see why. I do not have access to a similar graph for M10 aerotight nuts.

Aerotight nuts, with 1mm thick washers, rather than the "wafers", often offered, would be the route I would go down. Making sure that the studs, aerotight nuts and washers are clean and grease free, before applying a drop, no need to smother the stud, of your favourite nut locking fluid. Ensure that when nipped-up, the stud protrudes by at least a thread from the end of the nut locking ring and then torque to the manufacturers OME specification, or that given by any good engineering/fastener supplier guide. The washer increases the nut contact area, spreading the side thrust, which if your sprockets are correctly aligned, should be non-existent!

I suppose I should add, all at your own risk!  ::)

Good health, Bill

Steve H:
A lot of the Lambretta guys use these https://www.nord-lock.com/nord-lock/products/washers to keep their wheels on

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