recommend presta valve road tube 80mm stem WITHOUT removable core

[GrumpyGregry]

Which then pops off cos it has no grip.

Not if it is a screw on connector surely?

Pop off/friction pump connectors don't unscrew cores but I'm not riding around with my RennKompressor on my back.

 

[GrumpyGregry]

Looks like a Halfords valve too

Is that a good or a bad thing....?

 

[vickster]

Is that a good or a bad thing....?

The tubes do seem to split, but can get for £2 a piece

Comments above...

 

[raleighnut]

Not if it is a screw on connector surely?

Pop off/friction pump connectors don't unscrew cores but I'm not riding around with my RennKompressor on my back.

I'd sooner use my track pump at home though.

 

[wonderloaf]

Which then pops off cos it has no grip.

Haven't had any problems yet using the floor pump, although not had a reason to to use the bike pump yet. Just assumed that they may have taken this into account when designing the valve.

 

[GrumpyGregry]

Haven't had any problems yet using the floor pump, although not had a reason to to use the bike pump yet. Just assumed that they may have taken this into account when designing the valve.

What they've taken into account is pro race mechanics pulling the cores to deflate the tyres*


*this may be an urban myth.

 

[mjr]

and I've tightened them and applied nutlocking compound. By Lezyne pump tube still unscrews them.

Am considering superglue.

Do you realise that you only need to screw the pump on far enough to seal, not so far that it pushes on the core shoulder and so bites the core threads? If a seal's not forming without screwing it right the way on, I'd be wondering if the washer in the head is too thin, possibly from old age, or if it's just an incompatible pump/valve design combination.

 

[GrumpyGregry]

Do you realise that you only need to screw the pump on far enough to seal, not so far that it pushes on the core shoulder and so bites the core threads? If a seal's not forming without screwing it right the way on, I'd be wondering if the washer in the head is too thin, possibly from old age, or if it's just an incompatible pump/valve design combination.

^This

 

[GrumpyGregry]

Do you realise that you only need to screw the pump on far enough to seal, not so far that it pushes on the core shoulder and so bites the core threads? If a seal's not forming without screwing it right the way on, I'd be wondering if the washer in the head is too thin, possibly from old age, or if it's just an incompatible pump/valve design combination.

As Lezyne themselves say here...

On presta valves with a removable valve core: Before use with pump, remove valve core


and apply small amout of LOCTITE thread locker to valve core threads. Reinstall valve core

and securely tighten.

 

[mjr]

^This

I'd be blaming the pump if it's doing it with multiple tube brands, though... apart from a widely-discussed bad batch/version of Contis, I've not had it happen.

 

[GrumpyGregry]

I'd be blaming the pump if it's doing it with multiple tube brands, though... apart from a widely-discussed bad batch/version of Contis, I've not had it happen.

The only removable core tubes I own are Conti's. But if they feel the need to put "get yer Loctite out lads" in the pumps instructions...

 

[srw]

The only removable core tubes I own are Conti's. But if they feel the need to put "get yer Loctite out lads" in the pumps instructions...

...it's time to get a better pump.

 

[GrumpyGregry]

...it's time to get a better pump.

I've not found one, yet.

 

[raleighnut]

I've not found one, yet.

Topeak Road Morph, best pump ever. I got mine from Martin Webster (at 'Websters Cycles') and he told me he'd never looked at them (despite selling them)...........................His verdict "Fantastic pump, now I don't need to stick my trackpump in the bikebag when going on holiday"

 

[GrumpyGregry]

Topeak Road Morph, best pump ever. I got mine from Martin Webster (at 'Websters Cycles') and he told me he'd never looked at them (despite selling them)...........................His verdict "Fantastic pump, now I don't need to stick my trackpump in the bikebag when going on holiday"

Even uglier than me. And that takes effort.