Vittoria Randonneurs, psi too low?
07-18-12, 08:28 PM
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Vittoria Randonneurs, psi too low?
Need some opinions on whether or not Randos would work for me. I'm a bigger guy (6'3", 250lbs), and am a little concerned about the low max psi rating of these tires. Would really appreciate some insight from someone who's used them.
07-18-12, 08:48 PM
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Vittoria Randonneurs, psi too low?
I'd be getting 28c tires. I thought they had a max of 85 psi.
07-18-12, 10:06 PM
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07-18-12, 10:13 PM
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07-19-12, 12:42 AM
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07-19-12, 06:42 AM
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Max PSI is the pressure where the tire will blow off the rim. It is more of a question of tire size and rim construction than any inherent property in a tire. Any 28mm tire is going to have the same max PSI on a given rim. The Randonneurs have a low rated PSI more do to the fact that this is the optimum PSI for the tire's intended use, rather than what the tire is capable of.
07-19-12, 07:00 AM
#13
Your cog is slipping.
Not necessarily true. A 28c Rando has max psi of 85 while a 28c Rubino has a max psi of 120.
This. However, I've found that keeping them at the recommended 85 psi feels like riding in mud.
I weigh about 190 these days and keep between 100-110 psi in my 28c Rando too. No problems and the ride is much, much better.
I weigh about 190 these days and keep between 100-110 psi in my 28c Rando too. No problems and the ride is much, much better.
Last edited by Scrodzilla; 07-19-12 at 08:15 AM.
07-19-12, 07:45 AM
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Any of you guys get hairline fractures in your sidewalls? I have a bunch and I only run 85 psi. My wife has none and she runs 85 psi too. What gives? All my tires do this. It seems to be harmless, but it sucks to have all these hairline cracks in my sidewalls. Is it normal?
(we both use 700x28 Rando)
(we both use 700x28 Rando)
07-19-12, 01:46 PM
#16
Elitist
Any of you guys get hairline fractures in your sidewalls? I have a bunch and I only run 85 psi. My wife has none and she runs 85 psi too. What gives? All my tires do this. It seems to be harmless, but it sucks to have all these hairline cracks in my sidewalls. Is it normal?
(we both use 700x28 Rando)
(we both use 700x28 Rando)
Sheldon says:
Dry Rot
"Dry rot" is a fungus that infects cellulose-based materials: wood, paper, cotton and the like.
Sometimes people speak of bicycle tires as if they suffer from dry rot, but this is not generally correct. (The exception would be for cotton-cord tires, but those pretty much disappeared by the mid 1960s, at least as far as clinchers are concerned.)
What people commonly call "dry rot" is a deterioration of the rubber, usually on the sidewalls. This is particularly common with gumwall tires that have been exposed to ozone damage. (A common cause of this is storing a bicycle near a household furnace. The brush-type motors on such furnaces often create sparks, which in turn create ozone.)
This type of damage is ugly, but not structurally significant, as long as the cords (fabric) of the tire are intact.
Generally, if a tire isn't lumpy/misshapen when inflated, and has not had the tread area worn too thin, there is no reason to replace it, no matter how ugly the sidewalls get.
"Dry rot" is a fungus that infects cellulose-based materials: wood, paper, cotton and the like.
Sometimes people speak of bicycle tires as if they suffer from dry rot, but this is not generally correct. (The exception would be for cotton-cord tires, but those pretty much disappeared by the mid 1960s, at least as far as clinchers are concerned.)
What people commonly call "dry rot" is a deterioration of the rubber, usually on the sidewalls. This is particularly common with gumwall tires that have been exposed to ozone damage. (A common cause of this is storing a bicycle near a household furnace. The brush-type motors on such furnaces often create sparks, which in turn create ozone.)
This type of damage is ugly, but not structurally significant, as long as the cords (fabric) of the tire are intact.
Generally, if a tire isn't lumpy/misshapen when inflated, and has not had the tread area worn too thin, there is no reason to replace it, no matter how ugly the sidewalls get.
07-19-12, 01:51 PM
#17
You got any electrical motors in the areas your bikes live?
https://en.wikipedia.org/wiki/Ozone_cracking
Tires will last a lot longer when stored away from anything that may generate Ozone as part of it's operating cycle.
https://en.wikipedia.org/wiki/Ozone_cracking
Tires will last a lot longer when stored away from anything that may generate Ozone as part of it's operating cycle.
07-19-12, 04:12 PM
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FWIW I also pump my randos up above the max PSI rating.
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