Inner tube valve nuts

Or thought of asking Avon customer service what their advice is? (Assuming that the tube is an Avon product). Awkward now as it is the Easter weekend I know.

I guess it depends on the way that the valve is fixed into the tube - some I've had, had a very small 'flange' on the valve, so if the external nut was nipped up aggressively you might 'pull' the valve through the hole. An internal nut would prevent that. Of course this wouldn't be an issue for a large 'flanged' valve. 

I’ve always put one on the inside just nipped up and left the outside one off to allow the valve to move if there is tyre creep.

dan

Please ask Avon why and tell us the answer..

Never really thought about it.Mostly I've fitted only one nut 1½ turns loose. Then as Dan said it's easy to see if correctly fitted and any tyre creep. Without knowing, I believe centrifugal force can't pull the valve into the tyre more than one mm. Could be that my rims have fairly tight holes so an inside nut is not needed.

Edit: Of course the nut is there so that the valve don't disappear when inflating.

Orriginally the bikes had one inside and one outside. I did some research when I fitted my tyres a few years back ,and it seemed the most preferred way is both on the outside locked together a little way away from the rim. This allows the valve to move if the tyre creeps . I still use Rim locks (as fitted by Norton ) so my tyres can't creep . I expect in my arrangement one inside and one locked to the rim outside would work fine too. Something I have learnt is that  tiny rust particules formed in the rim well can cause punctures, I have Hammerited the wells ,dried well and use Duct tape with  a rim tape. to cover all the steel not touched by the tyre. Not std and at your own risk!.