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Defective tire bead?

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Old 04-15-22, 05:01 PM
  #1  
drewfio
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Defective tire bead?

I bought a new Panaracer Pasela tire, and I've tried a few times to inflate it, but it keeps coming off the rim when inflated up to pressure.

This tire says max 95 psi, and the tire starts to comes off at around 75psi. It doesn't happen immediately, but slowly after a minute or two. I had another Pasela on here previously that seated and inflated fine. When I compare the beads of the two they look different in a number of ways, but most notably it looks like there is less of lip/hook. There is also some wonkiness here and there in the overall shape (though this smooths out when I start to inflate. There are also little rubber ridges on the bead on the problematic tire. The other difference is that the problem free one is 27" x 1 1/8" and the new one is 27" x 1 1/4". 14mm inner width rim. I've put fatter tires on skinner rims without this happening, so I don't think that is the cause.

I've attached pictures of the two tires side by side. Left tire in the photo seats fine, and has been ridden no problem. Right keeps blowing off the rim. Is this a tire defect and causing my issue?

Thanks for the help!

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Old 04-15-22, 06:00 PM
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what are the specs of the tube that you are using? Is the tape/strip interfering with the tire bead?
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Old 04-15-22, 06:15 PM
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Originally Posted by Troul
what are the specs of the tube that you are using? Is the tape/strip interfering with the tire bead?
It is a continental race 28 25-32. It also says 27 x 1 1/4 on the box. I don't think the strip is interfering.

I just gave it another shot actually. I've changed many many tires, but I went through it again more slowly and carefully. So far it's been about 10 minutes at 80 psi and still standing. Fingers crossed.

If this holds, maybe I'll chalk it up to rim/tube/tire combo. The tire is not super snug on this rim and slipped on fairly easily, and the tubes are quite snug to the rim since even though it says 27 they are meant for 700 (do they make 27" specific tubes anymore?). So perhaps this combo made it so the tube could more easily creep under the bead during installation if not crazy careful.

I'll post back if it does/does not survive a while.

Last edited by drewfio; 04-15-22 at 06:15 PM. Reason: typo
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Old 04-15-22, 06:20 PM
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Are the ISO sizes the same? Should have a 630mm x 32-33mm for the 27 x 1 1/4" tire. 630mm being the bead to bead diameter.
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Old 04-15-22, 08:07 PM
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What rim are you mounting these on? Is it a hook edge one?

Tires generally have a smaller range of fit diameter then rims do, or rims tend to have greater tolerances of actual bead seat diameter. But stuff does happen during making any high volume product so it could be the tire has an out of tolerance bead. Have you tried this tire on a different rim? Andy
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Old 04-15-22, 11:14 PM
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Originally Posted by Andrew R Stewart
What rim are you mounting these on? Is it a hook edge one?

Tires generally have a smaller range of fit diameter then rims do, or rims tend to have greater tolerances of actual bead seat diameter. But stuff does happen during making any high volume product so it could be the tire has an out of tolerance bead. Have you tried this tire on a different rim? Andy
They are hooked, not straight. Though looking more closely, the hook is not as pronounced I think as on some other wheels I have. Maybe this is contributing as well. I don’t have another 27 inch wheel to try it on though.
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Old 04-16-22, 10:26 AM
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Originally Posted by SurferRosa
Not knowing anything more, it sounds like a hookless rim from maybe a lower level vintage bike.

But reconsider required inflation for a road bike. It's a function of total weight (bike + rider) and tire width, not the max pressure written on the sidewall. With more weight, you need more pressure. With a fatter tire, less pressure is required. Using an online calculator, treat a 1 1/4" tire as 32mm.

I weigh only about 160 lb. I run my 25mm tires at around 90-95 psi. I would run 32mm tires closer to 65 lb of pressure. A little less in the front, a little more in the rear.
Yep it is vintage—a 1985 Nishiki Prestige. I don't know what you consider lower level, but it does have Tange Infinity tubing, so I wouldn't quite consider it junk. I've attached some photos of the inside of the rim so you can evaluate the presence/absence of a hook. The wheels are Araya rims with Sansin hubs. Also added a couple photos of the bike and wheels with the 27" x 1 1/4" tires now mounted, at 80 psi.

I measured and these are actually about 29mm wide on these rims. Probably pushing it for 14mm inner width rim. What psi would you suggest in this case? I typically run 25mm tires at 95 psi, and 32mm at 65-70, so I figured since this measure up in between those, I'd go with a pressure in between as well.

Test will be riding it I guess. Even if it stays on fine, it might not handle optimally. I've tried running some 28mm (actual) tires in the past on 13mm IW rims, and that did not feel great.

Thanks for the reply!






Last edited by drewfio; 04-16-22 at 10:27 AM. Reason: added info
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Old 04-16-22, 10:36 AM
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Are you positive those are 630 BSD rims? With the brake shoes bottomed out for max extension on the calipers it makes me wonder if those are 622 BSD.
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Old 04-16-22, 10:42 AM
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Originally Posted by Iride01
Are you positive those are 630 BSD rims? With the brake shoes bottomed out for max extension on the calipers it makes me wonder if those are 622 BSD.
it says 27 x 1 on the Araya sticker on the rim, and the very old tires that were On there when I got it were 27”.

The pads are bottomed out because I had another set of wheels, 700c, in the bike while I waited for tires. And I wanted to swap back because those wheels are more expensive and in perfect condition, and I was planning to lock this up outside when I go places, and worried about theft. I just now put these back in, so I do need to readjust the pads higher for the 27” wheels before I ride.
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Old 04-16-22, 12:18 PM
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Originally Posted by drewfio
I measured and these are actually about 29mm wide on these rims... What psi would you suggest in this case? I typically run 25mm tires at 95 psi, and 32mm at 65-70
Great pics. Thanks. I wish everyone would do that. It would make this forum run so much more efficiently.

As I said, required road tire inflation is a function of total weight and tire width. I would find an online calculator that you trust and go with those results.

But I would guess, at 80 psi for those tires, you're maybe 180 lbs?

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Old 04-16-22, 12:39 PM
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Originally Posted by drewfio
........... I just now put these back in, so I do need to readjust the pads higher for the 27” wheels before I ride.
Of course you do. They need to be centered on the braking surface of the rim and not overlapping the edge where they might rub or eventually rub on the tire.

I guess that wasn't a question, but more of a statement. But that how we roll here.... we imagine all sorts of things one might say. <grin>
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Old 04-16-22, 12:54 PM
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I buy mostly economical tries so finding defects is more common now days. Note also that I had to return some higher dollar Passelas because of defects too. So... When we get new tires ya just gotta give um a close, very close, inspection.

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Old 04-16-22, 01:54 PM
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Originally Posted by Iride01
I guess that wasn't a question, but more of a statement. But that how we roll here.... we imagine all sorts of things one might say. <grin>
they might prefer crispy tacos over a soft shell.
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Old 04-16-22, 07:59 PM
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Those look like Araya 20A rims to me. I've never had problems with tires blowing off of them. Make sure that you put a little air in the tube before installing it, ensure that the tube isn't trapped between the tire bead and rim at any point around the circumference of the wheel, and check to see if the lines molded into the tire are higher or lower at any spots as you're bringing the tire up to full pressure. If there is a low spot or a high spot, you can press it up or down with your thumbs, provided you haven't put too much air into the tube yet.
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Old 04-17-22, 02:54 PM
  #15  
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Originally Posted by ThermionicScott
Those look like Araya 20A rims to me. I've never had problems with tires blowing off of them. Make sure that you put a little air in the tube before installing it, ensure that the tube isn't trapped between the tire bead and rim at any point around the circumference of the wheel, and check to see if the lines molded into the tire are higher or lower at some spots as you're bringing the tire up to full pressure. If there is a low spot or a high spot, you can press it up or down with your thumbs, provided you haven't put too much air into the tube yet.
Yep, those are the rims. I just took it for a test ride today, after more carefully installing yesterday, and all seemed fine. It rode pretty nicely.
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