Winter air in the tyres . . .
01-09-20, 04:38 PM
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Winter air in the tyres . . .
Can't believe I'm writing this. All summer (such as it is in N Blighty) I've had to pump my tyres up like twice a week or so. A pain, really is. 'Cos if you don't, you bottom on the rims, and don't go so quick. It's hard on the old nether regions when one does that.
Come winter, I've not had to touch the pump. Now, I'm not going to expand on the physical properties of cooler air, but I'd ha thought I'd need more of it in the tyres, and possibly in me when I'm riding . . . .
Any explanation? It's been months since I've pumped, and am kinda wondering if something is seriously amiss . . . . . . .
Come winter, I've not had to touch the pump. Now, I'm not going to expand on the physical properties of cooler air, but I'd ha thought I'd need more of it in the tyres, and possibly in me when I'm riding . . . .
Any explanation? It's been months since I've pumped, and am kinda wondering if something is seriously amiss . . . . . . .
01-09-20, 05:43 PM
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Crap this reminds me, I still have the summer air in my tires. I better get it swapped...
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01-09-20, 05:54 PM
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'Tires lose air normally through the process of permeation, the council says. "Changes in outdoor temperature can affect the rate at which your tire loses air. This change is more pronounced in hot weather. Generally speaking, a(n automotive) tire will lose one or two pounds of air per month in cool weather, and even more in warmer weather." '
Which is different than,
'Every time the outside temperature drops 10 degrees Fahrenheit, the air pressure inside your tires goes down about one or two psi. Drivers should check their tire pressures frequently during cold weather, adding enough air to keep them at recommended levels of inflation at all times.'
From - https://www.drivers.com/article/354/
Which is different than,
'Every time the outside temperature drops 10 degrees Fahrenheit, the air pressure inside your tires goes down about one or two psi. Drivers should check their tire pressures frequently during cold weather, adding enough air to keep them at recommended levels of inflation at all times.'
From - https://www.drivers.com/article/354/
01-10-20, 07:32 AM
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No, but I've noticed this myself. Since I keep my bikes outside in an unheated shed, and I commute year-round, it's nice to not have to stand in the cold and top off the tires most mornings. I can usually wait till I get to work and do it indoors where I store my bike.
01-10-20, 08:54 AM
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Just my take-nothing to back it up, but: tubes/tires are more flexible when warmer, and they will more easily stretch, which allows the "pores" to open more, allowing more air to escape. If cold, they are "harder", so less air is able to escape. Think of the tires/tubes as water--when frozen, water will roll over and off of the ice, if in a liquid state, the water will go right into and through the water it is being poured into. At least, that's my take on it.
01-10-20, 07:42 PM
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Just another source to add to post 3.
"For rubber, permeation is the rate at which small molecules of a gas or liquid transfer through a rubber compound." and "Temperature is another factor that complicates permeability. Typically, the higher the temperature, the higher the rate of diffusion."
from - https://www.applerubber.com/hot-topi...ber-compounds/
"For rubber, permeation is the rate at which small molecules of a gas or liquid transfer through a rubber compound." and "Temperature is another factor that complicates permeability. Typically, the higher the temperature, the higher the rate of diffusion."
from - https://www.applerubber.com/hot-topi...ber-compounds/
01-11-20, 04:32 PM
#7
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'Tires lose air normally through the process of permeation, the council says. "Changes in outdoor temperature can affect the rate at which your tire loses air. This change is more pronounced in hot weather. Generally speaking, a(n automotive) tire will lose one or two pounds of air per month in cool weather, and even more in warmer weather." '
Which is different than,
'Every time the outside temperature drops 10 degrees Fahrenheit, the air pressure inside your tires goes down about one or two psi. Drivers should check their tire pressures frequently during cold weather, adding enough air to keep them at recommended levels of inflation at all times.'
From - https://www.drivers.com/article/354/
Which is different than,
'Every time the outside temperature drops 10 degrees Fahrenheit, the air pressure inside your tires goes down about one or two psi. Drivers should check their tire pressures frequently during cold weather, adding enough air to keep them at recommended levels of inflation at all times.'
From - https://www.drivers.com/article/354/
01-12-20, 09:26 AM
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So many factors affect this. If you're running tubes, the material of the tube is a factor. I have latex tubes on one of my bikes and those lose noticeable pressure just overnight when sitting in the garage. On the other hand, well-sealed tubeless tires tend to hold pressure much better than any of the wheel sets with tubes in the garage.
