-Originally posted by johnfoss-*
the purpose of this design is to prevent air leaking through the spoke
holes when using tubeless tires. The benefits for "regular" tires may
not be as apparent.*
This benefit is deceptive; the proper rim strip does just as well with
the advantage of being much lighter than the corresponding metal.


joemarshall wrote:
*more here

http://www.velocitywheels.com/zvino.htm

It looks like the inserts hold a nipple in them, so you may be able to
unscrew a broken spoke from the nipple and rescrew in a new one. *
But how do you get the inserts out to change a nipple?


*
Maybe without the bend at the nipple, you've got less chance of
breaking that end of the spoke than at the hub. *
Actually the bend for a typical 700c wheel is very very slight anyway.
And that's not where spokes break, they break at the 90 degree bend near
the head, due to fretting, usually from an undertensioned wheel.

*
Supposedly the load is spread over a larger area of the rim by the way
the spokes are attached, does that make any difference? *
Normal good-quality rims have either thickened metal around the spoke
hole, or make use of eyelets, which both accomplish the same thing.
Ditto for the wide-flange nipples I use on the Coker wheels.


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