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The boutique carbon fiber manufacturer Argonaut has a new gravel bike called the GR3 that features a super slack (68.5-degree) head tube in an otherwise racy-gravel package with a short head tube and 415mm chainstays.
I spent a few days in Bend, Oregon checking out the Argonaut facility and manufacturing process, which involves 3D-printing silicone mandrels. I got to ride the new bike for about 10 hours over three days on gravel roads, singletrack, and a little pavement.