Another day of wheel building (and so on).


A customer brought me two DT XC race rims—
the XR331—for building front and rear wheels.
It's a discontinued rim that's hard to find these days.

With DT, the maximum air pressure for a rim isn't determined by its "intended use."
Instead, they use a chart with rim inner width on one axis
and tire width on the other
to determine the pressure rating.

What I'm getting at is:
instead of saying "it's an MTB rim so MAX 3 bar,"
the XR331 has an inner width only slightly wider than
the RR411 road rim,
so its pressure limit is essentially the same as the RR411.
The sticker on the XR331 rim even shows
8.5 bar for a 25C tubed tire,
7 bar for a 25C tubeless tire—
specs that don't really look like an MTB rim at all.

The minimum tire width it can accept is also 25C, so
this rim was actually one of the lightest aluminum rims
for disc road bikesor rim brake riders who don't use a rear brake.
Early production batches could yield specimens as light as
369g or 372g,
but by the end it was over 400g,
so these two rims are pretty decent.


Built it.


Novatec D791
110–15mm BOOST hub, 28H


Half CX sprint 44 reverse Italian lacing.
I'll do the spoke wrapping later.