Tom Sherman °_° wrote:
Doug Cimper wrote:
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.
[...]

That is plastic deformation, not elastic. For example, the elastomers
used to make rubber bands have a hundred percent elastic deformation or
more before yielding, but only about one percent plastic deformation
before tensile failure.


So where can I buy some of this stretchy kevlar?

Every place selling it I've ever seen gave an "elongation before
breaking" of around 1%.

http://www.pelicanrope.com/new03.htm
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