rear hub studs

[woody]

I,ve got a problem with my series 2 , the rear hub studs keep falling out ! I was driving down the road and heard a knocking which got louder and louder and 3 out the 4 studs had worked loose and had fell out and the last one was loose !, i took the hub to a scooter shop and they said they,d never seen it happen before . I then fitted a second hand hub (in good order) and within 500 miles i heard the same knocking noise and after checking one of the studs had fell out and the other three were loose . does anybody know whats causing this please ?

[goldeneye]

have you got dome nuts holding your rim on? maybee they are bottoming out before holding the rim on tight, making it rock around and loosen/shear your studs. just had one in like that, but the studs were nearly worn through. if i"d lived 5 miles further , the lad would have been off! SCARY!

[corrado]

The above is definitely an isssue if you have tubeless rims fitted as the one piece rim is thinner than the tube type 2 piece rim.

[woody]

I,m running standard lambretta 2 piece rims held together with the correct dome nuts (these are fine ) its the ones to hold the wheel to the rim that are the problem , these are held on with the correct size nyloc nuts but its the actual stud coming out of the hub thats the problem , the rim isn,t slotted its fine its the studs work loose wrecking the threads in the hub and then fall out ?

[eibargum]

Woody, surely if the nuts are tight the studs couldnt turn to come loose if they wanted too , surely the nuts must be coming loose first.

[woody]

the nuts are tight and if they were to come loose the tyre an rim would come of the hub probably elongating the holes in the rim first as it works it way loose and the nuts fall off , but its not that its the studs working their way out of the hub , i just don,t know why its happening ?

[Stokie]

So the studs are coming out of the hub but the nuts are still tight ?
Are the studs therefore pulling through the casting and fcuking the hub ?
If not then I can't get me head around how they can unscrew themselves from the casing side without loosening the nuts that hold the rim on ?

[woody]

the studs seem to be unscrewing themselves from the hub and wrecking the threads that hold them in the hub ,
the studs are not pulling through the cases
its only the fact that the nuts are tight that the hub hasn,t fell off completely

[mark]

which means the dome nuts are bottoming out and not tightening to the rim thus allowing the studs to move surely, try nylocks

[Daggs]

Woody, i mean this to help.

The Dome nuts should hold the wheel to the hub, not the nylock nuts.
The nylocks therefore usually hold the split rims together.
As you seem to have this situation reversed. Is it possible you are radically over-tightening the nylocks and damaging the stud threads leading to the studs pulling through the hub?
Don't forget the studs are steel in aluminium.