Knurled nut on valve stem

[Vapin' Joe]

Valve nuts and dustcaps, straight in the bin.

 

[mjr]

Valve nuts and dustcaps, straight in the bin.

Your rims and pumps contain carp.

 

[Vapin' Joe]

Your rims and pumps contain carp.

As the dust cap has to come off before you pump the tyre up that's hardly relevant. And crap inside the rim isn't going to be kept out of the valve by the dustcap.

 

[mjr]

As the dust cap has to come off before you pump the tyre up that's hardly relevant.

The mud on my dust caps are probably on your naked valves, going into your pump when you push it on.

 

[Ian H]

The mud on my dust caps are probably on your naked valves, going into your pump when you push it on.

Possibly relevant for Schrader or Woods.

 

[youngoldbloke]

Your rims and pumps contain carp.

Sounds fishy to me .......

 

[screenman]

Sounds fishy to me .......

I would mirror that reply.

 

[mjr]

Oooh. Now you've done it.

Don't get @mjr started on Woods valves!

The most elegant solution and ironically not vulnerable to blowback because the air doesn't go out through the hole it goes in. If you run them without dustcaps, you can still end up pumping a little water or a clog of carp (don't you love autocorrect?) into your tube, but at least it's not trashing your pump connector head!

 

[midlife]

I've paid for them so I'm using them

 

[andrew_s]

I tend to buy smooth stems that don't have them.

What brand? I've not seen any smooth stemmed valves for a while (which may be related to me buying cheap tubes).

 

[youngoldbloke]

Michelin Airstop butyl and Aircomp latex, for starters. I much prefer smooth stemmed, and Airstop are my favourite tube (and I throw the dustcap away after fitting the tube, the only point of it is to protect the tube when folded tight).

 

[Jason]

In the past , I would always throw them away, but the last front wheel inner tube change, I noticed a rattle, which has been isolated to the Schrader valve. It doesn't have a thread, so will need to be kept as a spare when I have time to swap it out. I can't stand rattles from my bikes.

 

[HLaB]

What brand? I've not seen any smooth stemmed valves for a while (which may be related to me buying cheap tubes).

The two I've found are Mitchelin Airstop and Vittoria ultralite. The Vittoria have got removable cores so if you have a screw on pump like a Lezyne you'll need to tighten it first.