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Old 27-12-06, 04:10 PM   #11
RandyO
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Quote:
Originally Posted by wheelnut
Quote:
Originally Posted by RandyO
recommended pressures are for cold tires
But what is a cold tyre?

A cold tyre in Tangiers might be 20degree C and in Glesga a cold tyre could be -5'c


cold tire temp is the temp on tires that haven't been warmed up on any given day by riding on them

don't worry about ambient temperature

when tires are warmed up, they increase pressure by 4-6psi
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Old 27-12-06, 06:50 PM   #12
ejohnh
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Quote:
Originally Posted by RandyO
Quote:
Originally Posted by wheelnut
Quote:
Originally Posted by RandyO
recommended pressures are for cold tires
But what is a cold tyre?

A cold tyre in Tangiers might be 20degree C and in Glesga a cold tyre could be -5'c


cold tire temp is the temp on tires that haven't been warmed up on any given day by riding on them

don't worry about ambient temperature

when tires are warmed up, they increase pressure by 4-6psi
You cannot ignore ambient temperature because tyre pressure varies with it. A 17C difference in ambient temperature gives a 2psi (approx) diff in pre-warmup pressure. Probably splitting hairs if you are content to be 2psi out on your running pressure.

Happy New Year
John
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Old 27-12-06, 08:27 PM   #13
Alpinestarhero
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cold being around 15-20 degrees. Thats cold enough from optimum operating temp of 60-70 degrees!

Matt
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Old 27-12-06, 11:36 PM   #14
ejohnh
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Quote:
Originally Posted by alpinestarhero
cold being around 15-20 degrees. Thats cold enough from optimum operating temp of 60-70 degrees!

Matt
you are studying chemistry?

I studied applied heat. 15-20C approximates to 60-70F, the rest is what? Are you saying that tyres get up to 70C? If so I am amazed.

JohnH
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Old 28-12-06, 06:42 PM   #15
RandyO
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Quote:
Originally Posted by ejohnh
Quote:
Originally Posted by RandyO
Quote:
Originally Posted by wheelnut
Quote:
Originally Posted by RandyO
recommended pressures are for cold tires
But what is a cold tyre?

A cold tyre in Tangiers might be 20degree C and in Glesga a cold tyre could be -5'c


cold tire temp is the temp on tires that haven't been warmed up on any given day by riding on them

don't worry about ambient temperature

when tires are warmed up, they increase pressure by 4-6psi
You cannot ignore ambient temperature because tyre pressure varies with it. A 17C difference in ambient temperature gives a 2psi (approx) diff in pre-warmup pressure. Probably splitting hairs if you are content to be 2psi out on your running pressure.

Happy New Year
John
yes, IGNORE ambient temperture

what ever temperature it is when you start to ride, check your pressure before you ride, if the pressure doesn't meet recommended cold pressure, raise or lower it accordingly, regardless of temperature
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Old 28-12-06, 08:13 PM   #16
ejohnh
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Default what temp is a warm tyre? :o)

Does anyone know what temp a tyre achieves when it is warmed up? Is it fairly constant?
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Old 28-12-06, 08:49 PM   #17
RandyO
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Default Re: what temp is a warm tyre? :o)

Quote:
Originally Posted by ejohnh
Does anyone know what temp a tyre achieves when it is warmed up? Is it fairly constant?

40°F-60°F above ambient temperature,
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