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Old 07-22-04, 01:51 PM   #1
Phatman
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man, i bought the wrong thing...rats

the other day, I was riding along, and all of a sudden, my front tire exploded. the whole sidewall was torn out, and so I needed a new tire.

I went today to buy a tire, and I bought a conti supersport 27x1 1/4, becuase that is the size I need. anyway, I got them home, and was looking at them, when I saw printed on the side "for hooked rims only" I definitly dont have hooked rims, and this is definitly a wire beaded tire. I thought you could mount a wire bead on a non-hooked rim.

so, anyway, I really dont feel like driving out to the shop again. has anyone ever mounted a tire for hooked rims only on a non hooked rim? what is the difference in the tire?
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Old 07-22-04, 02:34 PM   #2
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I may be wrong, but a hooked rim and a clincher rim are the same things. The other option is a sew-up/glue job, right?
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Old 07-22-04, 02:43 PM   #3
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well, the rim that I have is an old 27" clincher rim. heres a definition from sheldon: http://www.sheldonbrown.com/gloss_h.html#hook
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Old 07-22-04, 03:02 PM   #4
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When you put the tire on put a bit of air in (about 20 psi), then check that it is evenly seated all the way around. Then you can finish the inflation, but maybe not up to the the full pressure you usually give it.
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Old 07-22-04, 07:25 PM   #5
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Old 27 inch rims had straight inside flanges. This can cause problems with modern high pressure tires. I put a pair of Armadillo All-Purpose 27x1-1/4 tires on my old Raleigh with non hooked rims. The first time I tried to pump one up to 120 psi it blew off. I found I can run 100 psi safely so long as I make sure the tire seats evenly all around the rim.
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Old 07-22-04, 07:29 PM   #6
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I have also found you need to run lower pressure with new tires on old rims. You may have a hard time finding a "period" tire. Check your brakes and make sure they are not to high on the rim(touching the tire) as this will cause the blow out you had.
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Old 07-23-04, 02:02 AM   #7
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I believe you mean the ancient style of rim, common before about 1970? If so, you must be riding a very old cycle.
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Old 07-23-04, 07:23 AM   #8
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Quote:
Originally Posted by Rev.Chuck
I have also found you need to run lower pressure with new tires on old rims. You may have a hard time finding a "period" tire. Check your brakes and make sure they are not to high on the rim(touching the tire) as this will cause the blow out you had.
thats exactly the problem that I had. I did not seat the wheel in the dropout all the way, and so my brake pads rubbed. voila, explosion.
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Old 07-23-04, 07:24 AM   #9
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I believe you mean the ancient style of rim, common before about 1970? If so, you must be riding a very old cycle.
the bike is from the 1980s. 81, I belive by the brake levers.
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Old 07-23-04, 10:27 AM   #10
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My commuter is actually running an Araya rim from the mid-80's without a hook bead, running an Avocet 700x32 Kevlar bead, (and has been for months, 70psi). Some tires, regardless of the bead, don't work. In my experience, since it's a wire bead, if it is difficult to mount (i.e. get the bead over the rim), you're probably okay. If it's not nice and tight, fergetit. A blow-off will leave you with an unpatchable tube (as you've probably discovered), and low pressure helps, but will not prevent the problem for the wrong tire.
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Old 07-23-04, 10:36 AM   #11
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For what it's worth, my local walmart sells 27x1-1/4 tires that work well with old non-hooked rims. They are not real high pressure and are pretty cheap construction but are priced accordingly. Be sure to carry a flat kit with you. I used a pair on the old Raleigh before the Armadillos arrived.
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Old 07-23-04, 11:12 AM   #12
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I had forgotten about walmart. that actually might have been a good choice considering the bike is just a commuter fixie. oh well. I have a 21 dollar tire now, I'm gonna try it on the rim.

oh BTW its an "Ultrasport" not supersport. my bad.
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Old 07-23-04, 02:30 PM   #13
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most nonhook 11/4 tires are meant for about 80 psi. The warning(lawers) on the hooked only tire is probably because it won't work above 90psi on a non hooked rim and they want to label it as 120psi to make it sound superior(maketing). So give it a try.
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