-
• #452
Pumps. Yes pumps. I hate my lezyne thing. It sits in my pocket and I hate the thought of having to use it.
I don't want a frame pump, something longer than mini but smaller than a frame pump? -
• #453
What Lezyne one do you have?
-
• #454
Will PM it to you.
-
• #455
Giant do great accessories. I have a tiny mini-pump by them that can do Co2 as well. The pump on its own is not bad.
-
• #456
I've got one of these Lezyne micro floor drive things;
I think it's fantastic, will easily get up to 100 psi without stress.
-
• #457
And that fits in your back pocket?
-
• #458
Depends how big your back pocket is.
It's 300mm long. -
• #459
It'll go in your courier bag.
-
• #460
Club jersey pockets are 200 mm deep, so it leaves 110 mm out (as it's 310 mm long). My mini pump is 225 mm long.
I think Lezyne do a bottle cage mount for it too, which may not fit with your aesthetic, but is very practical.
-
• #461
C02 is for cunts.
-
• #462
I mean jersey pocket.
-
• #463
I bought co2 ages ago.....
-
• #464
People that hate the environment.
-
• #465
Also a tyre inflated with Co2 canister will naturally deflate quicker over time, than one inflated using a pump, due to science.
-
• #467
I bought my CO2 off you.
-
• #468
I'm not sure. I want to see the workings here.
-
• #469
Co2 is soluble in butyl rubber
-
• #470
And is a canister 100% co2, whereas atmosphere air is X %?
-
• #471
Will ask my science guy and get back to you on that
-
• #472
Is your science guy Wikipedia and Twitter?
-
• #473
No is a guy called Geoffrey.
Permeation by diffusion predicts gas leakage rates proportional to the inverse of the square root of their molecular weights. Using air as a reference the predicted leakage rates for common gases are: helium 2.7, air 1.0, nitrogen 1.02, oxygen 0.95, argon 0.85, carbon dioxide 0.81.
TLDR:
Co2 is not constrained to normal permeation loss.
-
• #474
Hmm. Is co2 more soluble in butyl rubber?
2 minutes with Google suggests that it's not permeation but solubility
.http://www.exploringoverland.com/overland-tech-travel/2016/3/25/3izopxom72k7p3vxpvjtfuhk7ouscc -
• #475
Co2 is soluble in butyl rubber
Andy send me your address and I will get a pair for you to try.