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armadillo tire pressure

Old 07-07-05, 08:30 AM
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deedummy
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armadillo tire pressure

just got a pair of new armadillo all condition tires 700x25... sidewall states 115-125 psi... for some reason i can't pump above 100 psi... anything over 100 psi, and the tire bead (terminology?) starts opening up to reveal the inner tube... then i have to release the air valve quickly before anything blows... right now i'm using around 85 psi... wondering if anyone can diagnose... other relevant info... i use a topeak road morph so i don't know how accurate this is... but i have used this pump up to 110 psi on my previous "regular" 700x25 tires with a stated max of 120 psi... tia
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Old 07-07-05, 09:32 AM
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i have them on my rain bike. i run 90-100# in the rear and 90-95# in the front. they're so stiff anyway why crank up the pressure higher?
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Old 07-07-05, 09:33 AM
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Originally Posted by deedummy
just got a pair of new armadillo all condition tires 700x25... sidewall states 115-125 psi... for some reason i can't pump above 100 psi... anything over 100 psi, and the tire bead (terminology?) starts opening up to reveal the inner tube... then i have to release the air valve quickly before anything blows... right now i'm using around 85 psi... wondering if anyone can diagnose... other relevant info... i use a topeak road morph so i don't know how accurate this is... but i have used this pump up to 110 psi on my previous "regular" 700x25 tires with a stated max of 120 psi... tia

The "correct" PSI for any tire is based on the load on the tire (the combined weight of the rider, his gear, and the bike). For a total load of 200 pounds, the correct PSI for a tire marked 25mm (which will measure 23mm or 24mm in actual width) is 105 PSI. You could add 5 PSI to the back for smoother roads.

A good tire "fit" depends on the width and design of the rim, and the tire, and can be affected by the width and thickness of the rim strip, and the size and thickness of the inner tube.

Have a good bike tech verify that a 25mm tire is a good match for your particular rim. Have him inspect the rim strip. Replace your current inner tube with a Continental tube designed for a 25mm tire. Have the tech install the tire. He will know the proper technique for fully seating the bead into the rim before inflating the tire.

Do NOT run 25mm tires at 120 PSI unless the total weight load on the tires is 230 pounds or more. The PSI marked on the tire is a "safety" rating that has absolutely nothing to do with the "best" PSI for a rider of a given weight. Over inflating a tire will reduce the width of the contact patch by 30% to 50%, and adversely affect ride quality, cornering, braking, and the longevity of the tire.
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Old 07-07-05, 11:51 AM
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I use 700x25 armadillo's with cxp33 rims. I've always worked on the assumption that if the tyre feels rock hard(thumb test) then it's just about right. The one and only time I've ever had the bead pop out of the rim was when I had not seated the tyre properly.
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Old 07-07-05, 01:34 PM
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Originally Posted by deedummy
just got a pair of new armadillo all condition tires 700x25... sidewall states 115-125 psi... for some reason i can't pump above 100 psi... anything over 100 psi, and the tire bead (terminology?) starts opening up to reveal the inner tube... then i have to release the air valve quickly before anything blows... right now i'm using around 85 psi... wondering if anyone can diagnose... other relevant info... i use a topeak road morph so i don't know how accurate this is... but i have used this pump up to 110 psi on my previous "regular" 700x25 tires with a stated max of 120 psi... tia
Something doesn't sound right with how your tire fits the rim. My 700x25 Armadillos fit tightly over my Aerohead rims. I can barely get them on and off without levers. Inflation is 120 psi, front and back. Total weight on the tires is approaching 250.

These same tires were almost impossible to get on and off my beater set of wheels with Mavic rims. Not all tires and rims fit the same.

Ron
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Old 07-07-05, 02:50 PM
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When I used Armidilloes I used to have to unscrew the ring on the valve after I go the tire on, Then I would have to push on the stem intil te tube got pushed up into the tire, The tire bead would then have room to seat properly around the valve. i would then pump it up and tighten the ring back down. Don't know if this will fix your problem but that is how I got them to work. The tube near the valve stem just wouldn't let that stiff bead sit right on the rim without doing that.
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Old 07-07-05, 03:23 PM
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thanks for all the input... i'll start from scratch to make sure the tube or tire gets positioned properly later tonight... looks like my thumbs and fingers are going to be aching some more after this...
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Old 07-07-05, 05:54 PM
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Yes, mine are at 120 with total load of about 210... Run fine, no explosion yet... really sticky though.
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