hi friend, yes, if you want to read old Bridgestone catalogs, Grant writes great copy -
https://www.sheldonbrown.com/bridgestone/
At the time of Bridgestone USA, the industry was fighting to stay alive by creating new niches and pushing techno, competition etc.
Grant went the other way, improving the steel bike by making it more versatile and reliable.
If you find the original XO-1 catalog listings, the term "retrogrouch" was first applied in print about Grant in bike rag reviews of the XO-1.
Many of the best components and accessories kept alive today, Nitto, DiaCompe, were parts that Grant designed for Rivendell Bicycle Works.
He keeps low inventory and all of his frame designs have fairly short runs, which helps keep the resale value up on the discontinued models.
https://www.rivbike.com/ - you can find a fairly incredible archive here, as well, and going back through the Blugs can also be fun.
While his market is definitely affluent, I think Rivendell bikes can be described as bikes for grown-ups.
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Jan Heine, the author of the article, has kept alive the French constructeur school in the US, with Rene Herse bikes,
http://www.renehersebicycles.com/, and Compass cycles,
https://www.compasscycle.com/
Jan mentioned several US brands - Salsa, Soma, All City, but there's a big school of custom frame builders in the US,
https://store.oceanaircycles.com/products/rambler
and many others importing good Taiwan steel frames to build more affordable bikes.
https://www.cyclestoussaint.com/products/velo-routier-bicycle