aramid bead on non-hook rim?

In article <[email hidden]>, [email hidden] says...

Quoted message said:

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.
-------------
Alex

Alex Rodriguez said:

In article <[email hidden]>, [email hidden] says...

Quoted message said:

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?

On Wed, 04 May 2005 14:31:55 -0500, Jim Smith <[email hidden]>

Quoted message said:

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.

Quoted message said:

Also, what exactly is the purpose of the "hook?" Is this documented
somewhere?

See above.

Quoted message said:

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.
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