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Old 05-04-09, 04:00 PM   #1
djnzlab1
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Max tire pressure?

HI,
I ve been reading another post about Optimizing your tire pressure, if you a rather heavy rider many of the thinner tires will require you to exceed the maxlimit on your tire.
example my new Continental tire reccomend a max pressure of 120 after doing the math 140 may be my optimal tire pressure for the rear wheel
Doug

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Old 05-04-09, 04:07 PM   #2
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You do not say how much you weigh but frankly, I would be more concerned with good quality rims and spokes. In all likelihood, the 120 recommended is all you need to have in the tires. Most folks over inflate.
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Old 05-04-09, 04:34 PM   #3
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Here is an old article from Precision Tandems on tire selection and pressure. It may be useful. http://www.precisiontandems.com/arttiresbymark.htm

The problem of heavy loads on tires is sideway fatigue and failure. The light weight 23 mm folding tires are great for lighter loads. Once you begin to pump up the tire pressure to accommodate heavier loads, it becomes more likely that the tire will release from the rim or the sidewall fails over time. For tandems, the 28 mm tire with a wire bead can sustain 140 psig with a heavy load. I run 25 mm foldable tires on our tandem at 120 psig. I tried a 23 mm GP 4000s and at 125 psig, the tire blew off the rim when we mounted the tandem.
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Old 05-07-09, 07:03 PM   #4
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Originally Posted by BikerJoeP View Post
You do not say how much you weigh but frankly, I would be more concerned with good quality rims and spokes. In all likelihood, the 120 recommended is all you need to have in the tires. Most folks over inflate.
That's what I think too. We use 700 X 28 tires on our tandem. I run them at 100 psi front and 110 psi rear and don't pinch flat. We're NOT a lightweight team.
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Old 05-07-09, 07:14 PM   #5
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Watch those tire dimensions. I put 700Cx28 Continentals on my Bianchi, and they fit only because they are actually only about 25mm wide. True 28s, such as Armadillos, would have rubbed the chainstays.
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Old 05-07-09, 08:13 PM   #6
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Quote:
Originally Posted by BikerJoeP View Post
You do not say how much you weigh but frankly, I would be more concerned with good quality rims and spokes. In all likelihood, the 120 recommended is all you need to have in the tires. Most folks over inflate.
+1
I try to go with as little pressure as I can get away with while avoiding pinch flats. When I weighed 225, I rode 28s with 105 psi. At 200 I went to 23s with105 psi. Now I'm 160 and I run 23s with 95 psi. No flats and plenty smooth rolling. The idea of running 140 psi makes my shoulders ache.
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Old 05-07-09, 08:58 PM   #7
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Personally, I think that unless you're actually racing, you would be better off with tires wide enough so that you don't need to go to 120 psi, but that's just me. I use 23's sometimes, but I'm light enough that I only really need about 95 psi in them.

Keep in mind that it can be a PITA to have to keep your tires at such high pressures, especially when you flat... but even at home with a floor pump before you ride, that's a lot of pressure. People often forget about the practical implications.
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