Blowouts 27 X 1/14 tires - schrader valves
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Blowouts 27 X 1/14 tires - schrader valves
I recently restored a 77' Zebrakenko Wind and purchased panasonic panaracer 27 X 1 1/4 tires for it. I am using it for my daily commuter.
The tires say 95 psi max on the sidewalls. I purchased an aergun x-1000 floor pump over the summer and used it for several months without incident with my touring bike running 700x28s. It has a pressure guage on it. I pumped the tires to 95 psi on the Zebra. All was going well until one night when I got home and had been off the bike for an hour or so. BANG, the rear tube ruptures - big gash on it. Hmm, so I thought, well, maybe that was due to using the old tube that came with the bike when I purchased it off of CL.
I then purchased several Continental Conti tubes - [Tour 28 (700C) ALL] - Schrader valves . The box says it is for 27 X 1 1/4 among several other sizes. I replaced the rear tube with one of the Continentals and left the original tube in the front tire. Weeks go by and then the other night, again AFTER I had arrived home, BANG - the front tube goes. A hole right on the valve itself - very strange. I replaced the front tube with another Continental.
At this point I lower the pressure on both tires to 90 PSI. Then tonight on the way home the rear tube goes again, one of the new Continentals, and again, a blowout.
I am thinking maybe the bead is not strong enough on these tires, but not sure. I had no issues with blowouts on the touring bike and using the aergun.
I think I will go to 80 PSI next.
Anyone have experience with the Panaracer tires or have any advice? Thanks.
The tires say 95 psi max on the sidewalls. I purchased an aergun x-1000 floor pump over the summer and used it for several months without incident with my touring bike running 700x28s. It has a pressure guage on it. I pumped the tires to 95 psi on the Zebra. All was going well until one night when I got home and had been off the bike for an hour or so. BANG, the rear tube ruptures - big gash on it. Hmm, so I thought, well, maybe that was due to using the old tube that came with the bike when I purchased it off of CL.
I then purchased several Continental Conti tubes - [Tour 28 (700C) ALL] - Schrader valves . The box says it is for 27 X 1 1/4 among several other sizes. I replaced the rear tube with one of the Continentals and left the original tube in the front tire. Weeks go by and then the other night, again AFTER I had arrived home, BANG - the front tube goes. A hole right on the valve itself - very strange. I replaced the front tube with another Continental.
At this point I lower the pressure on both tires to 90 PSI. Then tonight on the way home the rear tube goes again, one of the new Continentals, and again, a blowout.
I am thinking maybe the bead is not strong enough on these tires, but not sure. I had no issues with blowouts on the touring bike and using the aergun.
I think I will go to 80 PSI next.
Anyone have experience with the Panaracer tires or have any advice? Thanks.
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Have you checked the usual suspects -- rim tape, glass in the tire, etc?
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I recently restored a 77' Zebrakenko Wind and purchased panasonic panaracer 27 X 1 1/4 tires for it. I am using it for my daily commuter.
The tires say 95 psi max on the sidewalls. I purchased an aergun x-1000 floor pump over the summer and used it for several months without incident with my touring bike running 700x28s. It has a pressure guage on it. I pumped the tires to 95 psi on the Zebra. All was going well until one night when I got home and had been off the bike for an hour or so. BANG, the rear tube ruptures - big gash on it. Hmm, so I thought, well, maybe that was due to using the old tube that came with the bike when I purchased it off of CL.
I then purchased several Continental Conti tubes - [Tour 28 (700C) ALL] - Schrader valves . The box says it is for 27 X 1 1/4 among several other sizes. I replaced the rear tube with one of the Continentals and left the original tube in the front tire. Weeks go by and then the other night, again AFTER I had arrived home, BANG - the front tube goes. A hole right on the valve itself - very strange. I replaced the front tube with another Continental.
At this point I lower the pressure on both tires to 90 PSI. Then tonight on the way home the rear tube goes again, one of the new Continentals, and again, a blowout.
I am thinking maybe the bead is not strong enough on these tires, but not sure. I had no issues with blowouts on the touring bike and using the aergun.
I think I will go to 80 PSI next.
Anyone have experience with the Panaracer tires or have any advice? Thanks.
The tires say 95 psi max on the sidewalls. I purchased an aergun x-1000 floor pump over the summer and used it for several months without incident with my touring bike running 700x28s. It has a pressure guage on it. I pumped the tires to 95 psi on the Zebra. All was going well until one night when I got home and had been off the bike for an hour or so. BANG, the rear tube ruptures - big gash on it. Hmm, so I thought, well, maybe that was due to using the old tube that came with the bike when I purchased it off of CL.
I then purchased several Continental Conti tubes - [Tour 28 (700C) ALL] - Schrader valves . The box says it is for 27 X 1 1/4 among several other sizes. I replaced the rear tube with one of the Continentals and left the original tube in the front tire. Weeks go by and then the other night, again AFTER I had arrived home, BANG - the front tube goes. A hole right on the valve itself - very strange. I replaced the front tube with another Continental.
At this point I lower the pressure on both tires to 90 PSI. Then tonight on the way home the rear tube goes again, one of the new Continentals, and again, a blowout.
I am thinking maybe the bead is not strong enough on these tires, but not sure. I had no issues with blowouts on the touring bike and using the aergun.
I think I will go to 80 PSI next.
Anyone have experience with the Panaracer tires or have any advice? Thanks.
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Yup, non-hooked bead rims plus Kevlar bead tires = blowouts above 70 psi or so.
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90 to 95 psi seems a very high pressure for tubes with Schraeder valves. Back in the day, Presta valves were termed "High Pressure" - and with non-hook beaded rims, high pressure meant anything from 70 to 90 psi. You may be over-inflating the tubes on those rims. The tyre manufacturers maximum pressure marked on the tyre side wall is just that - a maximum for that tyre casing, nothing more.
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Wow, ok, thanks everyone, yes older Araya rims, perhaps original to the bike. Probably non-hooked. I would like to keep using the wheels as they are. Must of worked somehow back in the day. I was going to go down to 80 psi next but it sounds like 70 is the max on these.
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Wow, ok, thanks everyone, yes older Araya rims, perhaps original to the bike. Probably non-hooked. I would like to keep using the wheels as they are. Must of worked somehow back in the day. I was going to go down to 80 psi next but it sounds like 70 is the max on these.
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I had the same problem with one of my bikes. Tube kept exploding when the tire was pumped up to the max pressure. Was an old rim without a lip for the bead on the tire. Max pressure is about 70-75 on these types of rims.
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I've had several tubes do the same thing. A loud BANG when bike is resting. Then flat. Cheap Chinese tubes. I've been using "thorn proof" tubes on all my bikes for the last few years. They weigh a ton compared to ordinary tubes. But, I haven't had one explode on me yet. They hold 100 psi just fine.
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How much d'you weigh? Try out this calculator for a better starting point than just pumping 'em up to the max: Bicycle tire pressure calculator
i'll pass.
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I've had several tubes do the same thing. A loud BANG when bike is resting. Then flat. Cheap Chinese tubes. I've been using "thorn proof" tubes on all my bikes for the last few years. They weigh a ton compared to ordinary tubes. But, I haven't had one explode on me yet. They hold 100 psi just fine.
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Try the 45%/55% weight distribution option and see if that matches your preference better. If I ran that site, I'd make it the default since 40/60 doesn't represent road bike weight distribution as well, and could cause issues for riding on really steep hills. And as I said, it's just a starting point, not the end-all-be-all.
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Wow, ok, thanks everyone, yes older Araya rims, perhaps original to the bike. Probably non-hooked. I would like to keep using the wheels as they are. Must of worked somehow back in the day. I was going to go down to 80 psi next but it sounds like 70 is the max on these.
My original tyres were some specialized low end things, so I switched to some Panaracers and lowered the pressures to 70psi rear, and 65psi front. So far, so good.
I'll probably just rebuild the wheels with a Sun rim when I get the chance.
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one other thing you might check, just to rule it out, would be the manometer. you might make a comparison of its readings with a quality hand held one to see if they agree. chances are that it is fine but no harm in checking...
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I've had Schrader valves blow out spontaneously twice. (No, I don't mean the same valves blow out twice.) Once was while I was riding, once while the bike was sitting.
I've had once or two tires pop off of non-hooked-bead rims. I've never had a problem with hooked-bead rims. I run my 25mm Paselas at 115 to 120.
I've had once or two tires pop off of non-hooked-bead rims. I've never had a problem with hooked-bead rims. I run my 25mm Paselas at 115 to 120.
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scott, that's a little closer -- it results in 85 in the front and 105 in the rear.
i wonder if a lot of you run the front much lower than the rear. i never really do, but maybe it's a good idea.?.
i wonder if a lot of you run the front much lower than the rear. i never really do, but maybe it's a good idea.?.
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years ago when i ran michelin krylions, i had four blowouts like the op describes. they all happened after a ride. the tube was finally escaping between the rim and the bead. those tires were just really hard for me to seat properly. it's frustrating when you hear that rífle-like "bang!" when quietly pushing your bike through the chinese grocery.
glad i switched to wire bead paselas. hasn't happened since.
paselas are also a lot more cushy without giving up much in the way of speed.
glad i switched to wire bead paselas. hasn't happened since.
paselas are also a lot more cushy without giving up much in the way of speed.
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I try to keep my proselytism under control, but I'm a big fan. I've been running my 28's at 65/80 with a total weight of 190 lbs for something like 5 years now. My hands don't feel as beat up on rough roads and I have no pinch flats to report. Much nicer than when I pumped them up to an arbitrary 100psi because someone in my club told me to.
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I'm pretty sure Trueblood's problem is that the tire is not gripping the rim properly. It's a combination of an old straight sided rim, a new tire made for hooked rims, and high pressure. Possibly the tire wasn't seated right; no way to know that now. But if a tire has blown off a rim once, I tend to expect it to happen again.
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I'm pretty sure Trueblood's problem is that the tire is not gripping the rim properly. It's a combination of an old straight sided rim, a new tire made for hooked rims, and high pressure. Possibly the tire wasn't seated right; no way to know that now. But if a tire has blown off a rim once, I tend to expect it to happen again.
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90 to 95 psi seems a very high pressure for tubes with Schraeder valves. Back in the day, Presta valves were termed "High Pressure" - and with non-hook beaded rims, high pressure meant anything from 70 to 90 psi. You may be over-inflating the tubes on those rims. The tyre manufacturers maximum pressure marked on the tyre side wall is just that - a maximum for that tyre casing, nothing more.
I've got several wheels with Schraeder tubes... never had a problem at 90-105, but I do like to run them lower.
I can't say that I've done any sort of percentage thought... but 10-15 pounds lower than the max on the label.
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You simply have to run that combination of rim and tire well below max pressure. Or, you can swap out that old rim for replacement, like a Sun M13 or CR-18 rim, or buy tires with a tough wire bead, like Gatorskins.