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Deflating tires between rides(26 posts)

Deflating tires between ridesCHRoadie
Jul 9, 2003 1:13 PM
I've noticed some folks in my cycling club deflating their tires between rides. I was wondering if anybody here did that, and if so what the theory is behind it?
Oh, BROTHER!!!!Alexx
Jul 9, 2003 1:16 PM
Sounds like some anal-retentive types in that club!! I guess they just have too much time on their hands.
Oh, BROTHER!!!!jtolleson
Jul 9, 2003 1:17 PM
ditto to the description of it as anal-retentive. In addition, I think it would be HARDER on tires for a bike to sit on them uninflated between rides.
Oh, BROTHER!!!!ClydeTri
Jul 9, 2003 1:18 PM
when I posted my post, the word anal was in my mind also..they might be hanging their bike..
re: Deflating tires between ridesClydeTri
Jul 9, 2003 1:16 PM
the theory is that it will prolong the life of the tubes/tires..the reality is those people are crazy...the only positive thing that comes of it is that it forces you to pump them up before you ride, thus you will always start at full pressure, not a lower level from being too lazy to top them off...
sillyDougSloan
Jul 9, 2003 1:20 PM
More likely to damage a valve from re-inflating, IMO.

FYI: http://www.faqs.org/faqs/bicycles-faq/part3/section-15.html
It is a good idea for wall-art bikes ...Humma Hah
Jul 9, 2003 1:26 PM
Ozone rot happens faster to rubber under tension, so for museum bikes and wall art bikes, dropping the tire pressure to almost nothing, and hanging the bike to prevent flat spots, makes some sense.

For any serious cyclist, ozone rot should NOT be a factor for bikes ridden with any frequency. Robin Williams, who has hundreds of bikes, might ozone rot tires on some of his bikes before he wore out the tires ... the rest of us should not worry about it.

Parking or transporting a bike with fully flat tires is generally harmful. More chance of pinching the tubes, annoying flat spots may develop that you can still feel after inflating the tires, and clincher tires may lose their seat and either run bumpy or pop off when re-inflated.
I'm silly...HAL9010
Jul 9, 2003 2:52 PM
As Humma stated about Ozone & rubber under tension, right on. But my reason and I am hardly "anal" is that it forces me to look at my tires after a ride for imbedded glass or what not. And I find that I cannot "safely" remove those shards, small as they may be, while the tire is fully inflated.

I hang my bike from the ceiling but leave 10 - 20 lbs in each tire.

Doug: all I had to do to be good to my presta valves was to muck one up once, years ago to learn to practice "safe" inflating.

Yes, I always start a ride with correct pressure. It's just part of my Pre-Flight check out.
I'm silly...VW
Jul 9, 2003 3:19 PM
Leaving it inflated is better for me. Since I only ride once or twice a week, I can check back in a day or two after a ride to see if the tire is still fully inflated. If not, then I know it has a slow leak and I need to fix it before the next ride.

VW
What are you tinking?Dr Lizardo
Jul 9, 2003 1:31 PM
You idiots! Doncha know dat tyre elasticity declines wit da age of da tyre and therefore the less time da tyre is inflated da better. For most of you dats most of da time you are off of your bike which is most of da time. I'm sure dat pumping your tyres to take pictures of your pretty bikes to post on dis site will not negatively impact da life of da tyres.

Fools!

Lord John Worfin
Don't bother, Mother Nature will deflate them for you.terry b
Jul 9, 2003 2:09 PM
it's called diffusion.
Isn't it really calledMel Erickson
Jul 9, 2003 2:16 PM
dillusion?
or delusion?terry b
Jul 9, 2003 2:50 PM
I used to do itStraightblock
Jul 9, 2003 2:53 PM
When I raced & trained on tubulars with latex tubes, one of the Old Men on the team told me it was a good idea to let some of the pressure out of the tires between rides. His theory was that constant high pressure would stress the pores in the latex and cause them to lose pressure much faster. So we'd let them down to maybe 40-50psi after rides, enough so they'd still hold their shape and support the weight of the bike, but not be rock-hard.

From my own experience, some of the latex tubes did develop an annoying tendency to lose pressure unreasonably fast and would go almost completely flat after a few days if not pumped up. Cutting the tubulars open did reveal thin spots in the tube that bled air, but that may have been more an issue of 1970's Italian quality control than my teammate's grasp of science.

I haven't ridden tubulars or latex tubes in years now, and don't reduce air pressure unless I'm putting my wheels in the car trunk on a hot summer day. Ride time is too precious to spend pumping up tires.
re: Deflating tires between ridesmapei boy
Jul 9, 2003 2:57 PM
Back when folks rode silk-threaded tubulars, it was the thing to do to deflate them a little bit after you finished a ride. The idea was that, when fully inflated, the tire carcass had a tendency to stretch, causing the inner tube to potentially chafe on the carcass' insides, shortening the tire's life. Indeed, when I would deflate my silk tubulars after rides, they did seem to last last longer than when I did not. Now, with silk tires just a fond memory, the deflating of tires after rides is probably nothing more than a nostalgic affectation.
re: Deflating tires between ridesVW
Jul 9, 2003 3:06 PM
Actually, I heard somewhere latex inner tube tire should be deflated when not riding. Latex tube tend to deflates by itself fairly quickly (in a few days), but over many cycles of natural deflation, latex tube is suppose to loose its ability to hold pressure for any extended period of time. I don't know what "any extended period of time" means ... a few hours?

Most of today's inner tubes are not made with latex, so deflating tire is not necessary. Also, most tires now-a-days are clinchers. Back in the old days when all good bikes had tubular tires. Having tubular tires that doesn't hold pressure for "any extended period of time" could be a problem. Replace the inner tube of a clincher tire is easy, but changing the inner tube of a 1970's US$50 silk Clement tubular tire is not so easy (or even possible).

VW
Oh sure, fresh air rides smoother....asphalt assault
Jul 9, 2003 5:43 PM
You should always change your air before each ride, Lance does;^)
No No! Quality is Directly Proportional to Price!jtolleson
Jul 9, 2003 8:02 PM
What kind of roadie are you!

Clearly these tires must be reinflated with CO2 cartridges!

:)
scientific explanation behind the madness...Bruno S
Jul 9, 2003 8:06 PM
air is composed of many gases. Lighter, less dense gases tend to escape from the tires much more than heavier, more dense gases. If you just keep adding air to the tires everytime it looses some pressure it will start accumulating a higher concentration of the high density gases. As a result your tires will weight more. It is good practice to remove all air from the tires to restore the right proportions of lighter gases. :-)
scientific explanation behind the madness...ClydeTri
Jul 10, 2003 5:00 AM
how many of these light gases are between your ears? :~)
AlwaysRidearound
Jul 10, 2003 1:09 AM
Makes them last longer.

I found that my vittoria rubino pros were splitting a lot (I ride them at about 110 on a 25).

Someone at my club gave me the tip not to store them at that pressure. Now they last far longer.

It's just common sense - the rubber is under a lot of strain at that pressure.
Now that what I have been doing wrongzooog
Jul 10, 2003 1:27 AM
Air in tires. Now I know.
do you let the air out of your car's tires too? (nm)terry b
Jul 10, 2003 5:57 AM
Every timeRidearound
Jul 11, 2003 2:48 AM
I pump them up to 120 psi.
I use bottled air from France (nt)bburgoyne26
Jul 10, 2003 4:37 AM
I partially deflate my tires. . .Galibier
Jul 10, 2003 5:04 AM
... for two reasons. First, I carry my bike and tires in my trunk, and my car sometimes sits out in the sun. I don't want to leave fully-inflated tires in a hot trunk. Second, my floor pump seems unable to engage the presta valve unless I have reduced tire pressure to about 40-50 psi.