[RBW] Re: Deflate bike tires before ascent in car?

[A. Collins]

P1/T1=P2/T2  Gay Lussac's law  so if P1 is 120psi and T1 is 75F and T2 is 
125F P2 is 200 psi   In my world, southern Arizona this would not be an 
impossible swing.  Starting at 50 psi with the same temperatures you'd end 
up at 83.33F   Asa

On Saturday, August 2, 2014 10:48:03 AM UTC-7, lungimsam wrote:
>
> Related, since you are dirving:
>
>  
>
>> LBS employee said leaving your bike in a hot car with windows up can blow 
>> your tire or tubes. He said at events people in the crowd would applaud 
>> when they would hear a bang come from a car with a bike in it.
>
>  
>
>> So don't leave your windows up with the bike inside if its hot out unless 
>> you air down.
>
>
> Maybe this only matters for 120psi type tires and not rivish 50 psi tires.
>

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[RBW] Re: Deflate bike tires before ascent in car?

[lungimsam]

>
> Related, since you are dirving:

 

> LBS employee said leaving your bike in a hot car with windows up can blow 
> your tire or tubes. He said at events people in the crowd would applaud 
> when they would hear a bang come from a car with a bike in it.

 

> So don't leave your windows up with the bike inside if its hot out unless 
> you air down.


Maybe this only matters for 120psi type tires and not rivish 50 psi tires.

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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Trenker]

I'm not sure taking a bike to outer space would be such a good idea. 
There's nothing to ride on up there. 

 
  On Saturday, August 2, 2014 1:23:03 AM UTC-4, Metin Uz wrote:
>
>   Agreed. You can even take a bike to outer space and its tires 
> won't explode (at least if you keep it at reasonable temperatures).
>
>
>

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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Metin Uz]

Agreed. You can even take a bike to outer space and its tires won't explode 
(at least if you keep it at reasonable temperatures).

--Metin

On Friday, August 1, 2014 6:58:25 PM UTC-7, Anne Paulson wrote:
>
> I have *ridden* from 0 to 7000 feet quite a few times, without doing 
> anything to my tires. So have lots of other people on this list. Our tires 
> didn't explode off the rims. 
>
> Riding up mountains on one's bike is not a rare occurrence, and tires 
> don't explode when you get to the top. This is not a real problem.
>
>
> On Fri, Aug 1, 2014 at 5:28 PM, Chris Chen 
> > wrote:
>
>> Microbial dance party!
>>
>>
>> On Fri, Aug 1, 2014 at 5:26 PM, Garth > 
>> wrote:
>>
>>> How do you account for the bulging of *some* yogurt containers and milk 
>>> cartons low elevations like 600 ft. ? 
>>>
>>>
>>> On Friday, August 1, 2014 8:17:37 PM UTC-4, Metin Uz wrote:

 No, yogurt containers bulge and water bottles do too. They are at 0 psi 
 when they are sealed, so the change in ambient pressure results in a large 
 percentage change. Not so for a tire already under pressure.

 --Metin

 On Friday, August 1, 2014 3:06:26 PM UTC-7, Garth wrote:
>
>
> Yogurt containers bulging has more to do with the live cultures and 
> natural bacteria in it than elevation. You can often see containers of 
> yogurt at any level as they near the expiration date may bulge. Not to 
> mention a host of dairy products and other foods .  I would not buy them 
> !! 
>
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>>
>>
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>
>
>
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>
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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Anne Paulson]

I have *ridden* from 0 to 7000 feet quite a few times, without doing
anything to my tires. So have lots of other people on this list. Our tires
didn't explode off the rims.

Riding up mountains on one's bike is not a rare occurrence, and tires don't
explode when you get to the top. This is not a real problem.


On Fri, Aug 1, 2014 at 5:28 PM, Chris Chen  wrote:

> Microbial dance party!
>
>
> On Fri, Aug 1, 2014 at 5:26 PM, Garth  wrote:
>
>> How do you account for the bulging of *some* yogurt containers and milk
>> cartons low elevations like 600 ft. ?
>>
>>
>> On Friday, August 1, 2014 8:17:37 PM UTC-4, Metin Uz wrote:
>>>
>>> No, yogurt containers bulge and water bottles do too. They are at 0 psi
>>> when they are sealed, so the change in ambient pressure results in a large
>>> percentage change. Not so for a tire already under pressure.
>>>
>>> --Metin
>>>
>>> On Friday, August 1, 2014 3:06:26 PM UTC-7, Garth wrote:


 Yogurt containers bulging has more to do with the live cultures and
 natural bacteria in it than elevation. You can often see containers of
 yogurt at any level as they near the expiration date may bulge. Not to
 mention a host of dairy products and other foods .  I would not buy them !!

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>
>
>
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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Chris Chen]

Microbial dance party!


On Fri, Aug 1, 2014 at 5:26 PM, Garth  wrote:

> How do you account for the bulging of *some* yogurt containers and milk
> cartons low elevations like 600 ft. ?
>
>
> On Friday, August 1, 2014 8:17:37 PM UTC-4, Metin Uz wrote:
>>
>> No, yogurt containers bulge and water bottles do too. They are at 0 psi
>> when they are sealed, so the change in ambient pressure results in a large
>> percentage change. Not so for a tire already under pressure.
>>
>> --Metin
>>
>> On Friday, August 1, 2014 3:06:26 PM UTC-7, Garth wrote:
>>>
>>>
>>> Yogurt containers bulging has more to do with the live cultures and
>>> natural bacteria in it than elevation. You can often see containers of
>>> yogurt at any level as they near the expiration date may bulge. Not to
>>> mention a host of dairy products and other foods .  I would not buy them !!
>>>
>>  --
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[RBW] Re: Deflate bike tires before ascent in car?

[Garth]

How do you account for the bulging of *some* yogurt containers and milk 
cartons low elevations like 600 ft. ? 


On Friday, August 1, 2014 8:17:37 PM UTC-4, Metin Uz wrote:
>
> No, yogurt containers bulge and water bottles do too. They are at 0 psi 
> when they are sealed, so the change in ambient pressure results in a large 
> percentage change. Not so for a tire already under pressure.
>
> --Metin
>
> On Friday, August 1, 2014 3:06:26 PM UTC-7, Garth wrote:
>>
>>
>> Yogurt containers bulging has more to do with the live cultures and 
>> natural bacteria in it than elevation. You can often see containers of 
>> yogurt at any level as they near the expiration date may bulge. Not to 
>> mention a host of dairy products and other foods .  I would not buy them !! 
>>
>

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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Chris Chen]

Pedant here. They are *not* at 0psi. They are at ambient air pressure. :)


On Fri, Aug 1, 2014 at 5:17 PM, Metin Uz  wrote:

> No, yogurt containers bulge and water bottles do too. They are at 0 psi
> when they are sealed, so the change in ambient pressure results in a large
> percentage change. Not so for a tire already under pressure.
>
> --Metin
>
>
> On Friday, August 1, 2014 3:06:26 PM UTC-7, Garth wrote:
>>
>>
>> Yogurt containers bulging has more to do with the live cultures and
>> natural bacteria in it than elevation. You can often see containers of
>> yogurt at any level as they near the expiration date may bulge. Not to
>> mention a host of dairy products and other foods .  I would not buy them !!
>>
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[RBW] Re: Deflate bike tires before ascent in car?

[Metin Uz]

No, yogurt containers bulge and water bottles do too. They are at 0 psi 
when they are sealed, so the change in ambient pressure results in a large 
percentage change. Not so for a tire already under pressure.

--Metin

On Friday, August 1, 2014 3:06:26 PM UTC-7, Garth wrote:
>
>
> Yogurt containers bulging has more to do with the live cultures and 
> natural bacteria in it than elevation. You can often see containers of 
> yogurt at any level as they near the expiration date may bulge. Not to 
> mention a host of dairy products and other foods .  I would not buy them !! 
>

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[RBW] Re: Deflate bike tires before ascent in car?

[Garth]

Yogurt containers bulging has more to do with the live cultures and natural 
bacteria in it than elevation. You can often see containers of yogurt at 
any level as they near the expiration date may bulge. Not to mention a host 
of dairy products and other foods .  I would not buy them !! 

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[RBW] Re: Deflate bike tires before ascent in car?

[dougP]

Professional race team support vehicles carry loads of spare wheels, fully 
inflated & ready to ride, up to significant altitudes, often multiple times 
during the day, with no concern about exploding tires.  My guess is these 
tires are a good deal lighter in construction than a typical touring tire.  

I've seen that with food & beverage containers.  Always point them away 
from yourself when opening to avoid splatters.  Even happens on pressurized 
airplanes.  

dougP

On Friday, August 1, 2014 12:30:27 AM UTC-7, Jim Bronson wrote:
>
> The next couple of days I will be driving from my home around 500 ft 
> altitude to over 7000 ft before returning to near sea level.  
>
> I remember seeing yogurt containers in Santa Fe that were actually bulging 
> and it got me thinking that the same thing could happen with bike tires if 
> you departed lower elevation with near max pressure.  So i was thinking of 
> airing my LoupLoups down to 40psi or so for the trip.
>
> Or is it unnecessary?
>

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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Ron Mc]

Mad's 1000 snappy answers?  

On Friday, August 1, 2014 1:35:43 PM UTC-5, Anne Paulson wrote:
>
> If your tire is going to explode if its pressure increases by 5 psi, you 
> should not deflate it when you go to altitude. Rather, you should get a new 
> tire at once, because you are riding on a dangerous tire.
>
>
> On Fri, Aug 1, 2014 at 11:05 AM, Jim Bronson  > wrote:
>
>> I wouldn't let all the air out, just some.  It's inconvenient to roll 
>> bikes around if the tires are flat.
>>  On Aug 1, 2014 12:19 PM, "Anne Paulson" > > wrote:
>>
>>> No, no, no, and you don't need to deflate them when you put your bike in 
>>> an unpressurized airplane cargo hold either.
>>>
>>> Steve says, you don't need to do it but would it hurt? Well, yeah, it 
>>> could. Your pressurized tire nicely protects your rim. Your flat tire 
>>> doesn't.
>>>
>>>
>>> On Fri, Aug 1, 2014 at 9:18 AM, Ron Mc 
>>> > wrote:
>>>
 of course Bill. 


 On Friday, August 1, 2014 9:57:22 AM UTC-5, Bill Lindsay wrote:
>
> Ron
>
> You post the right chart but are interpreting it incorrectly.  At sea 
> level atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His 
> tire 
> pressure will increase by that same 4 psi.  When you measure tire 
> pressure 
> you measure the difference between the pressure inside the tire and the 
> difference outside the tire.  A 40 psi taken into the vacuum of outer 
> space 
> would then measure 55psi.  55psi absolute pressure inside the tire.  
>
> Your potato chips bag bulges but it's still a really low pressure.  
> Probably less than 1psi.  
>
> On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:
>>
>> here's the chart - Kg/cm2 is close enough to atmospheres  
>> https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-
>> adfb-36de54f87b9e.pdf
>>
>> On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:
>>>
>>> My tires are at 40psi max anyway, so I don't worry about it going 
>>> from 8k where I live to 13k on some passes. Based on Ron's numbers, if 
>>> you 
>>> keep your's at 60psi usually you'd endue at 72psi, so no big deal. If 
>>> you're concerned about it, you've naught to lose by dropping them down. 
>>>   
>>>
>>> With abandon,
>>> Patrick
>>>
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>>>
>>>
>>>
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>>>
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>>>
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>
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>
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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Anne Paulson]

If your tire is going to explode if its pressure increases by 5 psi, you
should not deflate it when you go to altitude. Rather, you should get a new
tire at once, because you are riding on a dangerous tire.


On Fri, Aug 1, 2014 at 11:05 AM, Jim Bronson  wrote:

> I wouldn't let all the air out, just some.  It's inconvenient to roll
> bikes around if the tires are flat.
> On Aug 1, 2014 12:19 PM, "Anne Paulson"  wrote:
>
>> No, no, no, and you don't need to deflate them when you put your bike in
>> an unpressurized airplane cargo hold either.
>>
>> Steve says, you don't need to do it but would it hurt? Well, yeah, it
>> could. Your pressurized tire nicely protects your rim. Your flat tire
>> doesn't.
>>
>>
>> On Fri, Aug 1, 2014 at 9:18 AM, Ron Mc  wrote:
>>
>>> of course Bill.
>>>
>>>
>>> On Friday, August 1, 2014 9:57:22 AM UTC-5, Bill Lindsay wrote:

 Ron

 You post the right chart but are interpreting it incorrectly.  At sea
 level atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His tire
 pressure will increase by that same 4 psi.  When you measure tire pressure
 you measure the difference between the pressure inside the tire and the
 difference outside the tire.  A 40 psi taken into the vacuum of outer space
 would then measure 55psi.  55psi absolute pressure inside the tire.

 Your potato chips bag bulges but it's still a really low pressure.
 Probably less than 1psi.

 On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:
>
> here's the chart - Kg/cm2 is close enough to atmospheres
> https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-
> adfb-36de54f87b9e.pdf
>
> On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:
>>
>> My tires are at 40psi max anyway, so I don't worry about it going
>> from 8k where I live to 13k on some passes. Based on Ron's numbers, if 
>> you
>> keep your's at 60psi usually you'd endue at 72psi, so no big deal. If
>> you're concerned about it, you've naught to lose by dropping them down.
>>
>> With abandon,
>> Patrick
>>
>  --
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>>
>>
>>
>> --
>> -- Anne Paulson
>>
>> It isn't a contest. Enjoy the ride.
>>
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[RBW] Re: Deflate bike tires before ascent in car?

[Metin Uz]

On Friday, August 1, 2014 5:42:04 AM UTC-7, Ron Mc wrote:
>
> from sea level to 7000', you'll get a 20% increase in tire pressure
>
>
>
That's true, only if you start with 0psi in your tires. The ambient 
pressure has dropped, but this does not proportionally increase the tire 
pressure, it simply adds a few psi to the pressure. It's easy to conduct a 
thought experiment to verify this. Imagine a tire taken to space (or vacuum 
environment). The pressure goes up by 14.7psi, which is the original 
ambient pressure no longer counteracting the pressure from the air in the 
tires. If the pressure were to be scaled, it would increase by an infinite 
ratio!

--Metin

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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Jim Bronson]

I wouldn't let all the air out, just some.  It's inconvenient to roll bikes
around if the tires are flat.
On Aug 1, 2014 12:19 PM, "Anne Paulson"  wrote:

> No, no, no, and you don't need to deflate them when you put your bike in
> an unpressurized airplane cargo hold either.
>
> Steve says, you don't need to do it but would it hurt? Well, yeah, it
> could. Your pressurized tire nicely protects your rim. Your flat tire
> doesn't.
>
>
> On Fri, Aug 1, 2014 at 9:18 AM, Ron Mc  wrote:
>
>> of course Bill.
>>
>>
>> On Friday, August 1, 2014 9:57:22 AM UTC-5, Bill Lindsay wrote:
>>>
>>> Ron
>>>
>>> You post the right chart but are interpreting it incorrectly.  At sea
>>> level atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His tire
>>> pressure will increase by that same 4 psi.  When you measure tire pressure
>>> you measure the difference between the pressure inside the tire and the
>>> difference outside the tire.  A 40 psi taken into the vacuum of outer space
>>> would then measure 55psi.  55psi absolute pressure inside the tire.
>>>
>>> Your potato chips bag bulges but it's still a really low pressure.
>>> Probably less than 1psi.
>>>
>>> On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:

 here's the chart - Kg/cm2 is close enough to atmospheres
 https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-
 adfb-36de54f87b9e.pdf

 On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:
>
> My tires are at 40psi max anyway, so I don't worry about it going from
> 8k where I live to 13k on some passes. Based on Ron's numbers, if you keep
> your's at 60psi usually you'd endue at 72psi, so no big deal. If you're
> concerned about it, you've naught to lose by dropping them down.
>
> With abandon,
> Patrick
>
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>
>
>
> --
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>
> It isn't a contest. Enjoy the ride.
>
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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Anne Paulson]

No, no, no, and you don't need to deflate them when you put your bike in an
unpressurized airplane cargo hold either.

Steve says, you don't need to do it but would it hurt? Well, yeah, it
could. Your pressurized tire nicely protects your rim. Your flat tire
doesn't.


On Fri, Aug 1, 2014 at 9:18 AM, Ron Mc  wrote:

> of course Bill.
>
>
> On Friday, August 1, 2014 9:57:22 AM UTC-5, Bill Lindsay wrote:
>>
>> Ron
>>
>> You post the right chart but are interpreting it incorrectly.  At sea
>> level atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His tire
>> pressure will increase by that same 4 psi.  When you measure tire pressure
>> you measure the difference between the pressure inside the tire and the
>> difference outside the tire.  A 40 psi taken into the vacuum of outer space
>> would then measure 55psi.  55psi absolute pressure inside the tire.
>>
>> Your potato chips bag bulges but it's still a really low pressure.
>> Probably less than 1psi.
>>
>> On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:
>>>
>>> here's the chart - Kg/cm2 is close enough to atmospheres
>>> https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-
>>> adfb-36de54f87b9e.pdf
>>>
>>> On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:

 My tires are at 40psi max anyway, so I don't worry about it going from
 8k where I live to 13k on some passes. Based on Ron's numbers, if you keep
 your's at 60psi usually you'd endue at 72psi, so no big deal. If you're
 concerned about it, you've naught to lose by dropping them down.

 With abandon,
 Patrick

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[RBW] Re: Deflate bike tires before ascent in car?

[Ron Mc]

of course Bill. 

On Friday, August 1, 2014 9:57:22 AM UTC-5, Bill Lindsay wrote:
>
> Ron
>
> You post the right chart but are interpreting it incorrectly.  At sea 
> level atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His tire 
> pressure will increase by that same 4 psi.  When you measure tire pressure 
> you measure the difference between the pressure inside the tire and the 
> difference outside the tire.  A 40 psi taken into the vacuum of outer space 
> would then measure 55psi.  55psi absolute pressure inside the tire.  
>
> Your potato chips bag bulges but it's still a really low pressure.  
> Probably less than 1psi.  
>
> On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:
>>
>> here's the chart - Kg/cm2 is close enough to atmospheres  
>> https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-adfb-36de54f87b9e.pdf
>>
>> On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:
>>>
>>> My tires are at 40psi max anyway, so I don't worry about it going from 
>>> 8k where I live to 13k on some passes. Based on Ron's numbers, if you keep 
>>> your's at 60psi usually you'd endue at 72psi, so no big deal. If you're 
>>> concerned about it, you've naught to lose by dropping them down.   
>>>
>>> With abandon,
>>> Patrick
>>>
>>

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Re: [RBW] Re: Deflate bike tires before ascent in car?

[Steve Palincsar]

In summary: do you /need/ to do this?  No.  Would it hurt?  No.  That's 
probably the same answer for tubulars; but traditionalists would always 
bleed the air out of their tubulars after a ride anyway, although I 
don't know why. (I know this still goes on, saw it after a ride last 
week.)  I'm not even sure it matters: there's so much ritual magic 
associated with tubulars and their use that defies logical explanation, 
kind of like thuribles.  Explaining it away wouldn't enhance the experience.


On 08/01/2014 10:57 AM, Bill Lindsay wrote:

Ron

You post the right chart but are interpreting it incorrectly. At sea 
level atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His 
tire pressure will increase by that same 4 psi. When you measure tire 
pressure you measure the difference between the pressure inside the 
tire and the difference outside the tire.  A 40 psi taken into the 
vacuum of outer space would then measure 55psi.  55psi absolute 
pressure inside the tire.


Your potato chips bag bulges but it's still a really low pressure.  
Probably less than 1psi.


On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:

here's the chart - Kg/cm2 is close enough to atmospheres
https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-adfb-36de54f87b9e.pdf


On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:

My tires are at 40psi max anyway, so I don't worry about it
going from 8k where I live to 13k on some passes. Based on
Ron's numbers, if you keep your's at 60psi usually you'd endue
at 72psi, so no big deal. If you're concerned about it, you've
naught to lose by dropping them down.



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[RBW] Re: Deflate bike tires before ascent in car?

[Tom Reingold]

Tires are built to withstand twice the rated maximum pressure. You won't 
get anywhere near that from a 7,000-ft ascent.


On Friday, August 1, 2014 3:30:27 AM UTC-4, Jim Bronson wrote:
>
> The next couple of days I will be driving from my home around 500 ft 
> altitude to over 7000 ft before returning to near sea level.  
>
> I remember seeing yogurt containers in Santa Fe that were actually bulging 
> and it got me thinking that the same thing could happen with bike tires if 
> you departed lower elevation with near max pressure.  So i was thinking of 
> airing my LoupLoups down to 40psi or so for the trip.
>
> Or is it unnecessary?
>

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[RBW] Re: Deflate bike tires before ascent in car?

[Bill Lindsay]

Ron

You post the right chart but are interpreting it incorrectly.  At sea level 
atmospheric pressure is ~15psi, and at 7000 ft it's ~11psi.  His tire 
pressure will increase by that same 4 psi.  When you measure tire pressure 
you measure the difference between the pressure inside the tire and the 
difference outside the tire.  A 40 psi taken into the vacuum of outer space 
would then measure 55psi.  55psi absolute pressure inside the tire.  

Your potato chips bag bulges but it's still a really low pressure.  
Probably less than 1psi.  

On Friday, August 1, 2014 6:27:06 AM UTC-7, Ron Mc wrote:
>
> here's the chart - Kg/cm2 is close enough to atmospheres  
> https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-adfb-36de54f87b9e.pdf
>
> On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:
>>
>> My tires are at 40psi max anyway, so I don't worry about it going from 8k 
>> where I live to 13k on some passes. Based on Ron's numbers, if you keep 
>> your's at 60psi usually you'd endue at 72psi, so no big deal. If you're 
>> concerned about it, you've naught to lose by dropping them down.   
>>
>> With abandon,
>> Patrick
>>
>

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[RBW] Re: Deflate bike tires before ascent in car?

[Ron Mc]

here's the chart - Kg/cm2 is close enough to atmospheres 
 https://www.avs.org/AVS/files/c7/c7edaedb-95b2-438f-adfb-36de54f87b9e.pdf

On Friday, August 1, 2014 8:19:31 AM UTC-5, Deacon Patrick wrote:
>
> My tires are at 40psi max anyway, so I don't worry about it going from 8k 
> where I live to 13k on some passes. Based on Ron's numbers, if you keep 
> your's at 60psi usually you'd endue at 72psi, so no big deal. If you're 
> concerned about it, you've naught to lose by dropping them down.   
>
> With abandon,
> Patrick
>

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[RBW] Re: Deflate bike tires before ascent in car?

[Garth]

Not necessary :)  

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=167

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[RBW] Re: Deflate bike tires before ascent in car?

[Deacon Patrick]

My tires are at 40psi max anyway, so I don't worry about it going from 8k 
where I live to 13k on some passes. Based on Ron's numbers, if you keep 
your's at 60psi usually you'd endue at 72psi, so no big deal. If you're 
concerned about it, you've naught to lose by dropping them down.   

With abandon,
Patrick

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[RBW] Re: Deflate bike tires before ascent in car?

[Ron Mc]

from sea level to 7000', you'll get a 20% increase in tire pressure

On Friday, August 1, 2014 2:30:27 AM UTC-5, Jim Bronson wrote:
>
> The next couple of days I will be driving from my home around 500 ft 
> altitude to over 7000 ft before returning to near sea level.  
>
> I remember seeing yogurt containers in Santa Fe that were actually bulging 
> and it got me thinking that the same thing could happen with bike tires if 
> you departed lower elevation with near max pressure.  So i was thinking of 
> airing my LoupLoups down to 40psi or so for the trip.
>
> Or is it unnecessary?
>

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