Paragon Machine Works built the invisible backbone of American framebuilding for 43 years. Then, in a single email, it was gone.
The email went out on a Thursday, March 26th, 2026. No press release. No announcement tour. No farewell summit at the NAHBS show or a tearful sendoff at the Philly Bike Expo. Just a note from Calvin Norstad – CEO, son of the founder, inheritor of 43 years of precision machining – landing quietly in the inboxes of framebuilders across North America and beyond.
“It fills me with great sadness to say that Paragon Machine Works will be ceasing all major operations, effective immediately,” the letter began. “The business is no longer viable due to industry and economic forces beyond our control.”
Seventeen words to close something 43 years in the making. Builders who had based their entire production workflow around Paragon parts – the dropouts, the headtubes, the bottom bracket shells, the derailleur hangers – read those words and felt the floor shift. Some started buying what inventory remained immediately. Others just stared at the screen.
It was, as one corner of the internet put it almost immediately, a seismic loss. That word – seismic – gets overused in cycling coverage. Here, it lands.
A Basement in Marin
Mark Norstad started Paragon Machine Works in 1983 in his parents’ basement in Corte Madera – a town in Marin County, California, which is both the spiritual birthplace of mountain biking and one of the more improbable addresses for the beginning of an industrial dynasty. He was young. He had machines bought on credit. He had no particular plan to be the most important parts supplier in the handmade bicycle world. He just needed work.
“When I started the company in 1983 it was a one-person job shop,” Norstad would explain years later. “The idea was I’d take on anything that came through the door, and the first thing that came through the door was bicycle dropouts. So that was a happy accident.”
The accident made sense, geographically. This was Marin County in the early 1980s – the precise moment and place where mountain biking was being invented on the fire roads of Mount Tamalpais. Builders like Steve Potts, Charlie Cunningham, Tom Ritchey, and Keith Bontrager were already there, trying to build bikes that didn’t yet have a supply chain. They needed custom parts, machined to tolerances that off-the-shelf couldn’t touch, in small quantities that no mainstream manufacturer would bother with. Norstad was there, and – by his own admission – hungry enough to say yes to anything.
The first real bicycle job came from TrailMaster Bicycles, one of the early mountain bike pioneers. They handed Norstad a sketch of a fork dropout and asked if he could make it. He said yes. He made it. That was, essentially, the rest of his life settled.
Norstad was tinkering with titanium before most machine shops in the country had bothered to learn the material – a metal that is difficult to cut, resistant to conventional tooling, and deeply unforgiving of shortcuts. That early mastery would become one of Paragon’s calling cards. By 1992, the reputation had crossed the Atlantic entirely. “I got this fax from Italy, from De Rosa,” Norstad recalled, “asking ‘Can you make this dropout for us?’ I had no idea how De Rosa found me – there really was no Internet back then – but it was really interesting that it was such an odd thing to be making bicycle parts out of titanium that people would go internationally to find people to do the work.”
From a basement in Marin. A fax from De Rosa. The shop that Norstad eventually built – literally, with his own hands alongside his brother – sat in an 8,000 square foot facility in Richmond, California, on the northeastern edge of San Francisco Bay. The same machines Norstad bought on credit in the early years were still running when the lights went off. Paid off, kept maintained, still cutting titanium.
The Hardware Store at the Center of Everything
To understand what Paragon Machine Works was, you have to understand what a framebuilder actually does – and what they can’t do alone.
A custom bicycle frame is, at its core, a collection of metal tubes joined together. The builder – a person with a torch, a jig, and years of practiced intuition – handles the joining. But the tubes need endpoints. The fork needs somewhere to accept a wheel axle. The frame needs a shell for the bottom bracket, a tube for the headset, a place to hang the rear derailleur, a mechanism for tensioning the chain on a singlespeed. These are the small, precisely machined components that live at every functional junction of the frame. They require CNC machinery, tight tolerances, and consistent material quality. They are, in short, exactly the kind of thing a one-person framebuilding operation cannot produce economically in-house.
Paragon made those things. Dropouts in steel, titanium, and stainless. Bottom bracket shells. Head tubes. Derailleur hangers. Cable guides. Caliper mounts. Braze-ons of every description. Their catalog was a reference library for anyone building a metal bicycle – not just the parts themselves, but the institutional knowledge encoded in their design, the engineering decisions that had been tested across thousands of frames and refined across decades.
At the NAHBS show – the North American Handmade Bicycle Show, the sport’s annual celebration of independent framebuilding – the joke was that it should have been renamed the Paragon and Spectrum show. Almost every steel and titanium bike in the room had Paragon parts somewhere in its anatomy. Peter Verdone, a veteran framebuilder who had worked with Norstad since the early days, made that observation at a show roughly fifteen years ago. He wasn’t wrong, and it wasn’t a complaint – it was a tribute. Paragon had become the shared infrastructure of an entire craft.
The 2008-09 recession offered an early test of that infrastructure’s durability. When the general machine shop work dried up – the non-bicycle jobs that Paragon had always kept on the books as a hedge – it was the bicycle business that kept the lights on. “All the job-shop work disappeared, and it was the bike stuff that financially got us through that,” Norstad said later. “It was an eye-opener. That changed our focus and we’ve pursued the bike stuff more, and it’s paid off.” He noted, with a pragmatist’s clarity, that someone with ten thousand dollars to spend on a custom bicycle has that money regardless of what the broader economy is doing.
He wasn’t wrong about that either. Until, eventually, the forces arrayed against the business became something other than recession.
Peak Paragon
There is a version of Paragon’s story that is a straightforward American success. A guy in his parents’ basement, a happy accident involving bicycle dropouts, four decades of steady growth, a 12-person operation serving framebuilders on four continents. By any honest measure, it is that story.
The timing was, for a long stretch, almost absurdly favorable. The handmade bicycle movement that had been a niche curiosity in the 1980s became a genuine cultural moment in the 2000s. NAHBS launched in 2005 and gave the community a focal point and a platform. Gravel riding emerged as a discipline and drove demand for exactly the kind of steel and titanium adventure bikes that required exactly the kind of parts Paragon specialized in. The internet allowed small builders to find customers they never could have reached through a physical storefront, which meant more builders, which meant more Paragon parts in more frames going out more doors.
At its peak, Paragon employed twelve full-time staff. They were shipping parts to builders across the United States, the United Kingdom, Australia, continental Europe, and even a handful of shops in Japan. Mark Norstad was recognized, in 2017, with induction into the Mountain Bike Hall of Fame – an honor that captured something true about his place in the sport’s history. The Hall’s citation called him “an unsung hero of mountain bike innovation” with the ability to “work with mountain bike innovators, understand and refine their ideas, and turn their designs into solid, reliable bicycle parts.” Unsung is the right word. Paragon’s name rarely appeared on the finished bikes. Their parts disappeared into the frames, invisible to the rider, essential to the builder.
In 2024, Norstad formally retired, handing the business to his son Calvin. The transition was quiet and orderly. Paragon appeared to be in reasonable shape – still showing new products, still running production batches, still the first call a framebuilder made when they needed a dropout.
And then, less than two years later, Calvin sent the email.
The Vise Tightens
“Industry and economic forces beyond our control.” That is what the closure letter said, and it is both accurate and insufficient – a phrase that does the work of explanation without doing the harder work of naming what, exactly, went wrong.
The forces were real, and they came from multiple directions at once.
The post-pandemic bicycle market correction was one of them. The cycling boom of 2020-2021 – when supply chains seized and demand spiked and bikes were backordered eighteen months out – reversed hard. By 2023, shops were sitting on unsold inventory, brands were canceling orders, and the industry was working through a hangover that is still not fully cleared. That correction hit the boutique end of the market differently than the mass market, but it hit nonetheless. Builders who had been busy found themselves quieter. Customers who had been impulsive became deliberate.
Tariffs added another layer of pressure – not on Paragon’s imports, but on the broader calculus of American manufacturing competitiveness. The economics of running a small domestic machine shop have always been challenging. The parts Paragon made are, technically speaking, not difficult to produce. Any competent machine shop with CNC capability can make a dropout. What Paragon offered was not just the part but the catalog depth, the quality consistency, the institutional knowledge, the willingness to run small batches, and the forty-year relationship with a community that had come to trust them implicitly. Those advantages don’t show up in a price comparison, and in a market where builders are already under margin pressure, the cheapest option has a stronger argument than it used to.
Then there is the deeper structural shift. Carbon fiber has not merely competed with steel and titanium at the high end – it has colonized it. A builder who once would have reached for a titanium Paragon dropout is now, in many cases, designing around a carbon layup or an additive-manufactured titanium lug that comes from a 3D printing service, not a Richmond machine shop. The category that Paragon had helped define – precision-machined metal components for handbuilt metal bikes – was not disappearing, but it was shrinking. And in a business model built on volume across a broad catalog of small parts, shrinkage is not easily absorbed.
Verdone, writing after visiting the Richmond shop one last time before it closed for good, was direct about what he saw: “Tariffs, COVID, generational changes, and bicycle advancements pushed against the company hard.” He noted that at the high end of the market, additive manufacturing had effectively taken over – that the most innovative builders were increasingly printing their own parts rather than ordering them from a catalog. “This was infesting the ecosystem,” he wrote, in a tone that mixed grief with clear-eyed analysis. “It got more difficult to survive as a custom frame builder.”
If it got more difficult to survive as a frame builder, it got proportionally more difficult to survive as the shop that served them.
The Hole in the Catalog
What Paragon leaves behind is not easily replaced, and the community knows it.
Other parts suppliers exist. Paragon was not the only machine shop in the world making dropouts. But it was the most trusted, the most comprehensive, and the most deeply integrated into the workflow of North American framebuilding. Its catalog represented not just a list of parts but a shared vocabulary – standard dimensions, standard interfaces, standard solutions to standard problems – that builders across the continent had converged on over four decades. That convergence is what enabled the boutique framebuilding market to function as something more than a collection of isolated craftspeople. It was, in an important sense, the shared infrastructure of the whole enterprise.
Paragon’s announcement included a notable gesture toward the future: the company is making its intellectual property available – the CAD and CAM files, the CNC programs, the tooling – for sale or release into the public domain. It is a generous and pragmatic move, the kind of thing a company does when it cares more about the community it served than about protecting the competitive moat it built. Whether any shop steps into the breach and takes on meaningful portions of the Paragon catalog remains to be seen. The economics that made it difficult for Paragon will not be any friendlier to whoever tries next.
In the short term, builders are doing what builders do: solving problems with what’s at hand. Some are buying out Paragon’s remaining inventory while it lasts. Some are learning to CNC their own small parts. Some are simplifying designs to reduce dependence on specialized components. Some are turning to European suppliers or smaller domestic shops that have operated quietly in Paragon’s shadow. None of those solutions are seamless, and some of them only work for builders with capital, machinery, and time that not everyone has.
The builders who will feel this most acutely are not the ones at the top of the market – the handful of names whose waiting lists and price points insulate them from most supply shocks. It’s the mid-tier builders, the ones running small operations without the resources to invest in their own CNC infrastructure, the ones for whom Paragon’s catalog was not just convenient but financially necessary. For them, the loss is not abstract.
What Stays
There is a frame somewhere – thousands of frames, tens of thousands – with a Paragon dropout in it. On a trail in Vermont, a gravel road in Oregon, a cobbled climb somewhere in Belgium ridden by an American expatriate who had a custom bike built before she left. The parts don’t announce themselves. They don’t carry the builder’s name or the material spec or the fact that they came from a machine shop in Richmond built by a man and his brother with their own hands. They just work. That was always the point.
Mark Norstad’s summary of his own work was simple enough to fit on a business card: “I make products that allow frame builders to build the bikes that advance frame building. That’s been true since 1983, and is still applicable today.” He said that before the closure, when Paragon was still running and the future was still, plausibly, open. The statement holds anyway. The bikes built with Paragon parts are still out there. The builders trained on Paragon’s catalog are still working. The vocabulary Paragon helped establish – the shared standards and dimensions and design solutions that made a dispersed community of independent craftspeople function like something coherent – does not disappear the moment the machines in Richmond go quiet.
But the quiet is real. Forty-three years of precision machining, of answering the phone when a builder needed one odd part in a strange material on a tight timeline, of being the place where the mountain bike community’s hardware ambitions met actual metal – that ends, and what replaces it will be assembled piecemeal from whatever the market decides to build next.
