I’ve been using latex tubes for years and aware that they lose air quicker than butyl tubes. I have new HED Jet + wheels and they seem to go from 72 to 40 overnight vs. my old school narrower 808 goes from 100 to 80. Close to 50% loss vs. 20%. Am I paranoid that I messed up the valve extender installation in the new wheels or this a normal amount.
My race is tomorrow so I don’t have a long time to experiment.
I think you’re overthinking the moment, I think mine could be anywhere from 20% to 50% on any given day.
I like the new Silca latex tubes with aluminum stem. They lose significantly less pressure than older tubes. These are really just rebranded Vittoria tubes and it looks like recently they (Vittoria) changed something in the tube material which makes them hold on to air better. I shipped my bike to IMAZ last year and the tires still had about 60-70psi in them after 10 days in transit.
I’ve been using latex tubes for years and aware that they lose air quicker than butyl tubes. I have new HED Jet + wheels and they seem to go from 72 to 40 overnight vs. my old school narrower 808 goes from 100 to 80. Close to 50% loss vs. 20%. Am I paranoid that I messed up the valve extender installation in the new wheels or this a normal amount.
My race is tomorrow so I don’t have a long time to experiment.
It will vary between brands and even potentially tube batches; then if you use different tyres, that could affect it slightly too.
I like the new Silca latex tubes with aluminum stem. They lose significantly less pressure than older tubes. These are really just rebranded Vittoria tubes and it looks like recently they (Vittoria) changed something in the tube material which makes them hold on to air better. I shipped my bike to IMAZ last year and the tires still had about 60-70psi in them after 10 days in transit.
I’ve been using latex tubes for years and aware that they lose air quicker than butyl tubes. I have new HED Jet + wheels and they seem to go from 72 to 40 overnight vs. my old school narrower 808 goes from 100 to 80. Close to 50% loss vs. 20%. Am I paranoid that I messed up the valve extender installation in the new wheels or this a normal amount.
My race is tomorrow so I don’t have a long time to experiment.
As far as the air loss goes, I would think that as long as you have sealant in there an extender issue wouldn’t be a problem. If the extenders were really improperly installed the leak-down would be huge.
Josh Portner talked about this. Vittoria started adding Graphene to the tubes and the air loss has dropped.
Not sure if there is a correlation here, but I use Vittoria latex tubes. When I ran 23mm tires I used the smaller 18-23mm tube and those lost air like crazy over a few hours (would go from 90 to 50 overnight). But then I switched to 25mm tires and now run the Vittorias still, but the 25-28mm size and those hold air reasonably well. (They go from 80 to 70 overnight)
My non-scientific, casual observation is that I lose about 1 PSI per hour with latex tubes. Air loss is not linear, of course, but this has been consistent for me when I have pre-pumed my tires at night to about 90 PSI, and then re-pumped them in the morning, about 12 hours later, for my ride.
they seem to go from 72 to 40 overnight
Yes, that seems excessive air loss to me.
I’ve been using latex tubes for years and aware that they lose air quicker than butyl tubes. I have new HED Jet + wheels and they seem to go from 72 to 40 overnight vs. my old school narrower 808 goes from 100 to 80. Close to 50% loss vs. 20%. Am I paranoid that I messed up the valve extender installation in the new wheels or this a normal amount.
My race is tomorrow so I don’t have a long time to experiment.
Seems high, but don’t sweat it. Sort it out after the race.
Pump them to 75 right before the race and you’ll be absolutely fine.
After, pull out the tube, remove the stem and extenders, reinstall with 2 layers of teflon tape on the threads. Trip excess width so that it doesn’t flap around and get in the way.
How are you measuring the pressure loss?
How are you measuring the pressure loss?
I’m measuring it by pumping it up and then looking at the gauge when I attach the pump the next morning before adding any air. There is always some loss when attaching the pump.
How much air goes into the pump’s hose?
How much air goes into the pump’s hose?
Easiest way to test this is to pump up your tires, remove the chuck, then reattach it. Every pump is going to be slightly different based on the volume of air the hose can hold, as well as how cleanly the chuck can be applied to the valve head without any other leakage besides pressurizing the hose.
Sorry, I knew the answer to my question. I just wanted others to think about it.
Not sure if there is a correlation here, but I use Vittoria latex tubes. When I ran 23mm tires I used the smaller 18-23mm tube and those lost air like crazy over a few hours (would go from 90 to 50 overnight). But then I switched to 25mm tires and now run the Vittorias still, but the 25-28mm size and those hold air reasonably well. (They go from 80 to 70 overnight)
I think the additional stretching of the tube has a lot to do with this.
Not sure if there is a correlation here, but I use Vittoria latex tubes. When I ran 23mm tires I used the smaller 18-23mm tube and those lost air like crazy over a few hours (would go from 90 to 50 overnight). But then I switched to 25mm tires and now run the Vittorias still, but the 25-28mm size and those hold air reasonably well. (They go from 80 to 70 overnight)
I think the additional stretching of the tube has a lot to do with this.
Josh Poertner mentioned recently on a podcast that Vittoria has apparently started adding Graphene to their latex tube material (Vittoria supplies the Silca tubes) and this supposedly has reduced the air diffusion rate through the material…so, in this case it could be partially attributed to “old vs. new”…
How much air goes into the pump’s hose?
That depends on the temperature and pressure doesn’t it Dr Boyle?
And inside diameter and length.
Not sure if there is a correlation here, but I use Vittoria latex tubes. When I ran 23mm tires I used the smaller 18-23mm tube and those lost air like crazy over a few hours (would go from 90 to 50 overnight). But then I switched to 25mm tires and now run the Vittorias still, but the 25-28mm size and those hold air reasonably well. (They go from 80 to 70 overnight)
I think the additional stretching of the tube has a lot to do with this.
Josh Poertner mentioned recently on a podcast that Vittoria has apparently started adding Graphene to their latex tube material (Vittoria supplies the Silca tubes) and this supposedly has reduced the air diffusion rate through the material…so, in this case it could be partially attributed to “old vs. new”…
Makes sense to me
I looked at a pair of my race wheels which were pumped up 13 days ago. They have the new tubes. They are just about fully pumped
Don’t want to hijack the thread, but on the subject of latex tubes what’s the life expectancy? I have a wrapped in box set that are over 10 years old, are they still and good?