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How fast do your tires go down?

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How fast do your tires go down?

Old 06-12-15, 04:24 PM
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How fast do your tires go down?

I don't mean downhill and I don't mean when you get a puncture.

I know the latex tubes in the Vittoria tubulars on the Motobecane are expected to lose air and of course they go down to nothing just sitting in the basement long enough. But two night ago I pumped up to about 145psi to ride to work the next day. They felt fine on the morning commute but a little soft on the ride home. So last night I pumped them up again, found they'd lost about 50psi over 24hrs! Well that explains why they felt soft on the commute home. So I pumped them to 145psi last night and checked them this morning, yep, they were down maybe 20psi. Pumped them to 150 or so for the commute in, and they still felt as I expect for the ride home. But I bet if I put the pump on them now they'd read in the 120 range.

My clinchers go down too but nowhere near that fast.

What are you experiences?
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Old 06-12-15, 04:28 PM
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Vittoria Corsa Evo CX tubulars: overnight, quite a bit. My experience is the same as yours.
Tufo S 33 Pro tubulars: takes about a month to go from 130psi to 100psi
With tubulars, it could be the tubes, but it could also be the valve cores. Most are removable, and many leak.

All my clinchers: 10psi/day for 2-3 days, bottoming out at 40psi in about a week or so, some slower than others.
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Old 06-12-15, 05:06 PM
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Narrower tires go down faster in my experience and anything latex needs filling at the start of the ride. Butyl clinchers are good for the weekend if filled on the first ride. YMMV.
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Old 06-12-15, 05:11 PM
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With butyl tubes, it's a function of volume and pressure. Narrow tires use less volume and high pressure, so I would expect both of the, to contribute to loss. My 35mm tires are slow to leak. I check them every three to four weeks. My wife had 22mm tires for a while, and I told her she has to pump them every day. She skipped my instruction, knowingly and got a pinch flat promptly. Since then, I gave her some 32's, since I want to try those 22mm Veloflex tires.

I suppose the tire is also a small factor, but how much?
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Old 06-12-15, 05:16 PM
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At least for HP narrow racing tires, It's not the tires, but the tubes that determine how quickly you lose air......
Latex tubes can only hold good, riding pressure for about a day at most, and that's it. You pretty much have to always pump them up everytime you ride the bike.
For butyl rubber tubes, it can be close to a week before they are getting too soft to ride.
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Old 06-12-15, 05:38 PM
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V
Originally Posted by Chombi View Post
At least for HP narrow racing tires, It's not the tires, but the tubes that determine how quickly you lose air......
Latex tubes can only hold good, riding pressure for about a day at most, and that's it. You pretty much have to always pump them up everytime you ride the bike.
For butyl rubber tubes, it can be close to a week before they are getting too soft to ride.
Yes, but observed is an interesting phenomenon, two bikes same tires, butyl tube tubulars.
Pump up both, ride one 2x, don't ride the other till the next day. The bike that was used has more pressure. The bike not used, softer tires.
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Old 06-12-15, 06:00 PM
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My tires go as fast as I can pedal them.
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Old 06-12-15, 06:02 PM
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Originally Posted by repechage View Post
The bike that was used has more pressure. The bike not used, softer tires.
Surely you aren't suggesting that using the bike keeps the pressure up?

Mostly I'm just observing and stating the obvious. Of course it makes sense that a narrower tire would go down faster. It has less air to lose by the cube of the scale, and less surface through which to lose it, but less less surface, if you take my meanin', by the square of the scale.

But I believe the tubes in the Veloflex Criteriums on the Masi don't lose air as fast as the Vittorias. Both are 23mm, IIRC.

I was just surprised that it lost that much, two to three times what I expected. I think it is worse than it use to be, so perhaps it is the valves as well as the latex. But what do I know?
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Old 06-12-15, 06:13 PM
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Latex tubes have that quirk. Epic ride, check the pressure. My butyl tubed clinchers run 115psi and are good for a week but only dropping 20Lbs.
@jimmuller which Vittoria tubular are you using? Enjoying them otherwise?
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Old 06-12-15, 06:29 PM
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Faster than a call girl at a political convention. I have the same tires.
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Old 06-12-15, 06:51 PM
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Originally Posted by jimmuller View Post
Surely you aren't suggesting that using the bike keeps the pressure up?

Mostly I'm just observing and stating the obvious. Of course it makes sense that a narrower tire would go down faster. It has less air to lose by the cube of the scale, and less surface through which to lose it, but less less surface, if you take my meanin', by the square of the scale.

But I believe the tubes in the Veloflex Criteriums on the Masi don't lose air as fast as the Vittorias. Both are 23mm, IIRC.

I was just surprised that it lost that much, two to three times what I expected. I think it is worse than it use to be, so perhaps it is the valves as well as the latex. But what do I know?
I had a bike that I rode two centuries on, a week apart, and the pressure was fine. In the interim they went flat sitting in the shop/living room.
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Old 06-12-15, 06:58 PM
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Originally Posted by OldsCOOL View Post
...which Vittoria tubular are you using? Enjoying them otherwise?
The Vittorias are Corsa EVO SC, 23mm, and yes I do like them. They were my initial plunge into tubulars and I figured I might was well try something good. I chose them because several people I know recommended them and because I liked the Open Corsa EVO SC I was running on light clincher rims on the Masi.

Wouldn't you know, on the first ride, my commute, I got a flat on the return home, less than 30 miles on the tire. At speed on a downhill I hit some debris that cut through the tread, probably would have cut through a Pasela TG too. Tire Alert fixed it but I think he didn't pick up my request for a lightweight tube because it feels heavier in the hand. Also the rim tape he used was thicker than the original, which might contribute to the weight increase too. I carry that tire as a spare now, haven't ridden on it yet but it does hold air.

The Veloflex Criteriums on the Masi were another extravagance when I built its tubular wheels. I had grown cautious of the Vittrorias because the Open Corsas had worn out so quickly. And they are made in the Far East somewhere now. So I figured I'd try something else. I think I like them better, but the differences between tires are pretty subtle.

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Old 06-12-15, 07:03 PM
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Originally Posted by seedsbelize View Post
I had a bike that I rode two centuries on, a week apart...
You mean like from late December 1999 to early January 2000?

Originally Posted by seedsbelize View Post
and the pressure was fine. In the interim they went flat sitting in the shop/living room.
Okay, I'll bite. If they went flat in the interim, how is that they were fine again for the second ride? come on, you must have pumped them up again between the rides.
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Old 06-12-15, 07:11 PM
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145 lbs?!?!

I ride tubulars so that I can ride with lower pressure, not higher. 145lbs is for the track, not a commute. Crappy US roads call for 80lbs or so.

That being said, I have good luck with better Conti's. I like the Veloflex high end, but they just don't hold up like Conti's.
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Old 06-12-15, 07:16 PM
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Originally Posted by jimmuller View Post
You mean like from late December 1999 to early January 2000?



Okay, I'll bite. If they went flat in the interim, how is that they were fine again for the second ride? come on, you must have pumped them up again between the rides.
I pumped them up in between. The point is that they went 100 miles (twice), over the course of nine or ten hours, without losing any pressure, but sitting unused they went completely flat in 6 days.
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Old 06-12-15, 07:20 PM
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Originally Posted by jiangshi View Post
145 lbs?!?!

I ride tubulars so that I can ride with lower pressure, not higher. 145lbs is for the track, not a commute. Crappy US roads call for 80lbs or so.

That being said, I have good luck with better Conti's. I like the Veloflex high end, but they just don't hold up like Conti's.
I don`t think my skinny tubulars would stay on the rim at 80 psi for very long?
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Old 06-12-15, 07:37 PM
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Originally Posted by RobbieTunes View Post
Vittoria Corsa Evo CX tubulars: overnight, quite a bit. My experience is the same as yours.
Tufo S 33 Pro tubulars: takes about a month to go from 130psi to 100psi
With tubulars, it could be the tubes, but it could also be the valve cores. Most are removable, and many leak.

All my clinchers: 10psi/day for 2-3 days, bottoming out at 40psi in about a week or so, some slower than others.
Same experience: Vittoria tubs overnight anywhere 50-70lbs loss, clinchers w latex tubes, loss of about 10-20 lbs overnight.

Frustrating because I don't have a pump at work and ride home on softer tubs. No worries on clinchers, but the ride is not as nice.

May have to try some tufo tubs.
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Old 06-12-15, 07:38 PM
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Originally Posted by jiangshi View Post
145 lbs?!?!

I ride tubulars so that I can ride with lower pressure, not higher. 145lbs is for the track, not a commute. Crappy US roads call for 80lbs or so.
I happen to like the feel of hard skinny tires mounted on light wheels. I do not like them soft. If I wanted soft tires I'd ride 28mm or even 32mm balloons. I have ridden plenty of miles with softer tires with puncture protection, etc. When I choose one of the tubular-tired bikes for my commute it is intentional.

But another reason I pump them up like that is because I expect them to sag. If I started the day with only 80psi I could end up riding home on 65psi or less. I've hit potholes so hard that I've bent good clincher rims and not flatted the tire. I'd rather not destroy a vintage Champion or NISI rim.
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Old 06-12-15, 07:45 PM
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Originally Posted by jimmuller View Post
I happen to like the feel of hard skinny tires mounted on light wheels. I do not like them soft. If I wanted soft tires I'd ride 28mm or even 32mm balloons. I have ridden plenty of miles with softer tires with puncture protection, etc. When I choose one of the tubular-tired bikes for my commute it is intentional.

But another reason I pump them up like that is because I expect them to sag. If I started the day with only 80psi I could end up riding home on 65psi or less. I've hit potholes so hard that I've bent good clincher rims and not flatted the tire. I'd rather not destroy a vintage Champion or NISI rim.
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Old 06-12-15, 08:44 PM
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Tubulars holding air

I pumped this tire to 110 psi in April, 2015.
7 weeks later it is down to 90 psi, with no air added since late April.
Perhaps around 200 miles ridden since then.
I will still ride it like this, I don't like to hassle with the valve stem vs tire air pump.

This tire is, dare I say it?, a Servizio Corse, now I'll run and hide.
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Old 06-14-15, 10:52 AM
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Originally Posted by Peugeotlover View Post

This tire is, dare I say it?, a Servizio Corse, now I'll run and hide.
Yes, you can say it. At that price and that weight they are hard to ignore.
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Old 06-14-15, 03:17 PM
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I have a set of magic wheels. Everything else will go lower over time, except this one set. I bought a brand new set of Gatorskin wire beads, installed them with new tubes, and after six months of sitting, there's no noticeable loss in pressure, and can be ridden without snake bites. If they sit up to a year, then they feel to soft to ride. ONLY set of tires/tubes I've ever had this kind of luck with. The rubber mix for the tubes and stem seals must have been perfect that day.,,,,BD
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Old 06-14-15, 03:30 PM
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Originally Posted by Bikedued View Post
I have a set of magic wheels. Everything else will go lower over time, except this one set.
He! If I don't pump my sew-ups at all I'm pretty sure they could sit for a year and not lose any air at all.
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Old 06-14-15, 08:25 PM
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Anyone, what the heck is 'butex'?

Recently purchased some Thai made Clement Super Condor tubulars. Two to three days and near flat. At 275gm and the low price, I don't expect them to have latex inners, but the company calls them 'butex'. I'm guessing that's just another marketing lingo for butyl, but if so, shouldn't drop pressure that quickly.
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Old 06-14-15, 08:45 PM
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Originally Posted by jimmuller View Post
I don't mean downhill and I don't mean when you get a puncture.

I know the latex tubes in the Vittoria tubulars on the Motobecane are expected to lose air and of course they go down to nothing just sitting in the basement long enough. But two night ago I pumped up to about 145psi to ride to work the next day. They felt fine on the morning commute but a little soft on the ride home. So last night I pumped them up again, found they'd lost about 50psi over 24hrs! Well that explains why they felt soft on the commute home. So I pumped them to 145psi last night and checked them this morning, yep, they were down maybe 20psi. Pumped them to 150 or so for the commute in, and they still felt as I expect for the ride home. But I bet if I put the pump on them now they'd read in the 120 range.

My clinchers go down too but nowhere near that fast.

What are you experiences?
Since I first used latex tubulars in the early '70s, that has been my experience, I estimate about 35% in 24 hours. Daily riding, daily pumping.
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