nut on a Presta valve - yes or no?

[rjb]

I purchased a MTB in 1988 from sjsc to my surprise it came with woods valves. I still use woods valves on some of my bikes but they have the core insert not the yellow tube variety.

[Mike Sales]

Some posters have mentioned buying tubes or bikes with the Dunlop/Woods valve.
Was the core the old type with a rubber sleeve? I mean the core which has a narrow extension with an air hole for the rubber sleeve to slide onto.
All that I have seen were.
I suppose that it may be cheaper to make this type than the modern easy-pump variety.

[jb]

Always wondered what those little rubber tubes were for that used to be included in puncture repair kits - hence the reason for the valve been removable so you could deflate it & change the rubber tube

[Mike Sales]

Always wondered what those little rubber tubes were for that used to be included in puncture repair kits - hence the reason for the valve been removable so you could deflate it.

Yes, and to replace the perished or torn rubber.
I remember Grandad putting a dab of saliva on the valve end to detect leaks.

[peterb]

An inflated tube is in contact with the tyre throughout both its long and short circumferences. I cannot imagine how it could move.
If, because of some mishap, like a puncture, it can move I cannot believe that being restrained by its valve would be very good for the tube.
The nut may make fitting and inflation easier, but is not essential.
In fact, if it is fitted and tightened befor the tyre's second bead is fitted, it may prevent that bead being seated properly.

- Makes it almost impossible to seat the the second bead, hence always best leave the nut off and start fixing the second bead at the point on the rim opposite the valve. Finish at the valve pushing the valve into the tyre with the thumb. Inflate tyre. Then throw the nut in your spares bin.

[Mike Sales]

An inflated tube is in contact with the tyre throughout both its long and short circumferences. I cannot imagine how it could move.
If, because of some mishap, like a puncture, it can move I cannot believe that being restrained by its valve would be very good for the tube.
The nut may make fitting and inflation easier, but is not essential.
In fact, if it is fitted and tightened befor the tyre's second bead is fitted, it may prevent that bead being seated properly.

- Makes it almost impossible to seat the the second bead, hence always best leave the nut off and start fixing the second bead at the point on the rim opposite the valve. Finish at the valve pushing the valve into the tyre with the thumb. Inflate tyre. Then throw the nut in your spares bin.

Indeed, I think we have covered the subject.

[jb]

Thinking about it (little to do at the moment) old type rims where not double skinned as most rims are today. So it would have been quite possible to yank the valve over to one side with the pump and rupture it.
Not easy to do with a modern rim perhaps? So happen that's why nuts were needed.?

[drossall]

I've certainly seen some valves over at quite an angle when the tube was misaligned, so makes sense. Occasionally, it's taken me several goes to get even tension in the tube from both sides of the valve, so that the thing would sit straight.

[Mick F]

I think it was mentioned up-thread.

When I was using Chrina rims, the hole in the inner wall of the rim was bigger than the hole in the outer rim.
Over the months, the tube near the valve would rip due to rubbing and stretching on the inner hole.

Cure was to fit a nut on the valve stem before fitting the tube, and then putting another on the outside. The inner nut supported the valve stem and tube.

I think it was CJ who suggested this idea .............. and it works.