john_childs said:*How common are these interrupted or segmented beads in folding tires?
The folding tires I've used seem to have a continuous Aramid (a.k.a.
Kevlar) bead around the tire. Is this segmented style of bead
something new? I've seen some folding tires that fold flatter than
others. Are those flat folding tires using a segmented bead? *
My camera is on the fritz or I'd post a couple of photos for you.
Basically there is a slight gap between segments where there is no bead,
only cloth. This allows there to be a full fold there, not just a bend.
However, the cloth itself is a little stiff, allowing a bump or crease
to appear at the gap. I'm pretty sure that this bump helps keep the
bead from locking in properly, especially with narrower rims where the
tire-rim angle is more extreme.
This theory is supported by WTB's stipulation that they not be used with
tubeless setups.
I'm not really sure how common they are; this is the first tire I
personally have seen with it. They do fold very well; I imagine that's
why they call it a "race" version. It might even fit in a jersey
pocket.
I have a wheel built with a KH rim and the Race version of the
Nanoraptor, and will endeavor to spend more time on it, both on- and
off-road, in the next weeks. The KH rim, being quite a bit wider than
the nearest competitor, may provide a better seating.
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