thirty-six wrote:

kevlar 'wires' are used with hook bead rim otherwise known as crochet
bead rim. If you are not using thistype of rim you need to use steel
wire for the tyre edge as its not the strength of the wire which
matteers so much as its ability to constrain, in other words, its
elasticity. A llarger section or higher running pressure tyre will
need stiffer wires to prevet tyre lift off and non-requisit
demounting. in other words you'll likely roll a tyre with kevlar
bead.

Kevlar has only about 1% elongation before breaking.

One thing I noticed about the tire bead and cables--the physical tire
bead (the one that you can see) is much larger than the actual cables
that really hold the tire from expanding.... so I wonder if the external
rubber ridge is needed at all? It might help protect the real bead from
idiots with tire levers but I don't use tire levers, so that don't apply
to me. ,,,,,,,I have a set of Big Apples I can't use because they won't
sit properly on the target bike's rims--the tire seats with a low spot
and I've never found any technique to help it. If the rubber ridge is
the cause of the seating problem and it's not necessary anyway, the
outside of it could be -carefully- trimmed off somewhat without harming
the tire.

You possibly can buy good tyre casing 'material' but you may
have to buy it by the mile. Other than laying out your own threads
and spraying them with latex to produce a single ply faric I cant see
you getting a small quatity of tyre casing material. a loom is not
necessary just wrap a card with your thin thread, spray with latex and
cut the fabric at 45deg.

I'll just have to use what I can find, at this point I doubt I'd find
anything quite like the "real thing" and making it myself doesn't sound
very practical.
~