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aramid bead on non-hook rim?
I have heard that using a tire with an aramid bead on an old non-hook
rim is a bad idea. Is this true? If so, could someone explain to me how the aramid bead behaves differantly than a steel bead? Also, what exactly is the purpose of the "hook?" Is this documented somewhere? A google search of the group only turns up some vague references to not use kevlar beads on non hook rims, but no explanation. |
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Alex Rodriguez writes:
In article , says... I have heard that using a tire with an aramid bead on an old non-hook rim is a bad idea. Is this true? If so, could someone explain to me how the aramid bead behaves differantly than a steel bead? Also, what exactly is the purpose of the "hook?" Is this documented somewhere? A google search of the group only turns up some vague references to not use kevlar beads on non hook rims, but no explanation. Steel or non-steel bead, if the tire requires a hook bead rim, you should use a hook bead rim. If you look at the tire closely you can see that the bead has 'bump' on it that fits neatly under the hook on the rim. That helps keep the tire on the rim under high pressure. I just looked at the tires I have (pasela TG 27x1-1/4) and they don't have that bump. They are smooth from the bead to the mold line which sits just above the rim when mounted. Does this mean they are made with hookless rims in mind? |
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On Wed, 04 May 2005 14:31:55 -0500, Jim Smith
wrote: I have heard that using a tire with an aramid bead on an old non-hook rim is a bad idea. Is this true? If so, could someone explain to me how the aramid bead behaves differantly than a steel bead? It's not the bead's material, it's the sidwall design at the bead's location that is important. Many aramid-bead tires have a flat sidewall, whiile in my experience more wire-bead tires have a sidewall that has a bit of a ridge along the area where the bead wire runs. This ridge grips better against a hooked rim than a flat sidewall will. Also, what exactly is the purpose of the "hook?" Is this documented somewhere? See above. A google search of the group only turns up some vague references to not use kevlar beads on non hook rims, but no explanation. Look at the tire, not the box, to see if it has a ridge, and bear in mind that the lack of a ridge does not mean that the tire *won't* work, though it may indicate that there is an increased chance of the tire bead lifting past the top of the flange in some cases. Remember; the rim's hook adds safety with a tire that has the ability to engage it, but either type of tire may work in either type of rim if it fits properly otherwise. -- Typoes are a feature, not a bug. Some gardening required to reply via email. Words processed in a facility that contains nuts. |
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