Marginal Gains Cycling Podcast, Presented by Silca

SILCA

The Marginal Gains Podcast, presented by Silca is the show that makes a big deal about the little things, and how those little things...can be a big deal. Josh Poertner of Silca, along with Hottie and Fatty, talk about all aspects of cycling — design, manufacturing, marketing, riding, racing, management and more, all from a thoughtful perspective. It's a podcast for the thinking cyclist.

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20 episodes
Updated July 28

Episodes20

Newest first

July 28 · 1 hr
Paige Onweller - Details Matter
While listening to Paige Onweller answer our questions, we found ourselves wishing we could be more like her. Wishing we had her organizational skills, her critical thinking, her ability to adapt quickly. Paige has the tools to be the kind of Marginal Gainer that makes us think, "I wish I was more like Paige." Paige's focus on details started well before she ever saw a Gravel Race start line. She was a collegiate runner and after that, had a career in medicine. But like we've heard from many runners, her sport led to injury which led her to the bike. At first, her riding was for fitness while she healed. But then she discovered how good she was, and so did others. Namely team Twenty-Twenty Four. They brought her on board to do Zwift racing and Time Trials. Before she knew it she was on a start line in Nebraska at Gravel Worlds. Then her career in medicine was put on hold as Paige took her detailed approach to the Life Time Grand Prix. Josh and Paige's partnership started this spring in the wind tunnel. The two of them got together for a focused approach on aerodynamics and women. They made some very interesting discoveries which we talk about in this show. Ever thought about waxing hair? You will after hearing them discuss Paige's aero bun.
July 6 · 54 min
AJA #51 Road Spray Aerodynamics and Argon Gas in Tires
Josh sinks his teeth into questions on turning road spray on a frame into aerodynamic information, Argon gas in tires and deep, carbon wheels for XC mountain bike racing. We also talk about Fatty's successful Everest challenge – the Marginal Gains that worked and the ones that didn't. And we get into some new happenings with Silca.
June 8 · 51 min
Rolling Resistance Testing with John Karrasch
A favorite topic on the Marginal Gains Podcast is rolling resistance, also known as CRR. It is one of the cornerstones of this show. While we have interviewed aerodynamic experts who have devoted hundreds of hours to CdA, we have found very few who have made CRR their passion. Tom Anhalt was an early guest but we can't think of another since. That changes with this episode. John Karrasch makes a living from bike fittings. But John has made a name for himself through his tire testing. Using the Chung method, John has been putting tires to the test to see which ones live up to the hype. In just more than a year, he has amassed an impressive database covering just about every brand you can name. The beauty of John's work and results is he shares it with all of us at no cost. In this interview, John shares his early beginnings with the Chung method, how he has refined his testing, and what some of the key learnings have been. The only thing between your bike and the surface you ride are your tires. John is one of a few who has been trying to quantify just how much power it takes to keep those tires rolling.
May 26 · 32 min
Inflatable Inserts and Radial Tires
It's funny how tubeless freed is from tubes and years later some of us turned to putting something else in the space between rim and tire. Namely inserts. Most of them are foam and a real struggle to install. Then there's OPTIS: The Odyssey Tire Pneumatic Insert System. Cool acronym that basically means "inflatable insert." The people at Odyssey will be quick to say OPTIS is not a tube. While it does press up against the sidewall when inflated, it's job is just like a foam insert: to prevent pinch flights. OPTIS weighs significantly less than a foam insert, and its behavior is adjustable. We spoke with Jacob Hinton from Odyssey on this unique product that recently gained notoriety during a spring classic. Up next is a look at radial tires for bikes. 32-inch wheels have garnered most of the buzz in 2026, but radial tires are also making waves. Two big tire makers have jumped into the space and made claims of enhanced grip for gravity-style riding. A third company, Delium, has also been developing radial tires. We hear from this lesser-known maker about how tech works and its potential in the bike space.
May 11 · 57 min
AJA #50 Inserts-Optimal gears-Narrow Bars
Our 50th Ask Josh Anything! That's a lot of questions and answers and "It Depends." Thanks for hanging with us to the mid century mark. On the Q&A agenda this episode: The perfect padding for aero armrests. Tire inserst for Unbound Breaking in tires for best CRR The right gears for an Everesting Narrow flat bars for Leadville Gravel wheels on a road bike and the rule of 105
April 30 · 41 min
Sea Otter Pt. 2 - Big Wheels Keep on Rollin'
Our first episode that covered the topic of 32 inch wheels focused on the bigger wheels being used on mountain bikes. Daniel Yang of Neuhaus Metalworks put us on a prototype rigid mountain bike and took us for a ride. It was eye opening. But it also raised questions. At Sea Otter we saw a shift by some builders and manufacturers as to where they thought the big wheels might perform best. Drop Bar bikes supported by 32 inch wheels were just as common as Flat Bars at this year's show. Straight line speed and all day comfort was the reason given for developing a 32er gravel bike over a mountain bike. Like a lot of bike media, we set out to get some answers on the future of this "Big Idea." Daniel Yang is back with his report card on the trend. We also hear from two companies that were showing Gravel bikes that attempt to answer the question: Is bigger, better?
April 22 · 1 hr 4 min
Sea Otter Pt. 1 - Hooked on Road Wheels
We're not afraid to share an opinion on this show. At no time was that more apparent then when Josh let his thoughts known about hookless road wheels. It caused a bit of a reaction in the industry to say the least. And while we have some firm beliefs on certain technologies, we also believe in fairness. Which is why at Sea Otter we gave some wheel brands a platform to explain what has become a somewhat divisive topic. Our guests work for three brands: ENVE, CADEX and Mavic. Two of them stand behind road hookless as a high performance and safe feature. The third has stuck with hooked rims. All three bring a unique perspective on what it takes to secure a tire to a wheel. We also talk to these wheel makers about their brands as a whole: what's driving innovation, how pro peloton success turns into sales and for one of them, what it takes to revive a heritage brand.
April 14 · 1 hr 5 min
From Bike Magazines to YouTube with Ben Delaney
It feels like now more than ever it is important to find sources of information and reporting that are trustworthy. It used to be fairly easy: subscribe to a credible outlet and trust that said newspaper or magazine would have guardrails in place to get it right and to exercise fairness. As the internet and social media became the predominant sources we rely on, a lot of those guardrails were knocked down. It could be argued that the system in place now is more democratic. More wide open. More voices. But along the way the trust factor has taken a blow. That's why we wanted to talk to Ben Delaney. Ben came from the old school ways of cycling reporting. He got a degree in journalism. He got a job at a magazine. He did the work and made his way up. Like a lot of his colleagues, he also took his lumps as traditional outlets succumbed to the pressures of lower ad revenues and tighter budgets. After being let go more than once by Velo, Ben decided to go solo. These days you can find Ben making videos for his gravel focused "The Ride" YouTube channel. It's one of Josh's favorites, so much so that Silca supports the channel. "The Ride" is a great place to check the latest in dropbar, offroad tech and trends. But this interview is less about gear and much more about the landscape of cycling media. How it got to where it is and what it needs to keep its credibility.
March 23 · 1 hr 2 min
Building Zipp with Andy Ording and Josh
Josh has spoken on many occasions about his time with Zipp. The engineering. The R&D. The wins. The fails. Josh was part of a team that changed the scene, both for pro and amateur racers. At the head of that team was Andy Ording. Andy took over Zipp from Leigh Sargent in 1998 and guided it through its glory days that Josh is so fond of. Andy's journey to carbon wheels is far from linear. A native of South Africa, he eventually found his way to the states via motorcycles. Andy's strengths are in sales and logistics and those strengths eventually led him to the bike industry. In this episode, Andy and Josh swap Zipp stories. They also share insights on what it takes to foster new ideas. How empowering people is one of the keys to making the next great Marginal Gain.
March 9 · 59 min
AJA #49: Helping Fatty Everest (A Marginal Gains Intervention)
Fatty drops a bombshell: he's turning 60 and attempting an Everesting challenge this June — and he needs Josh and Hottie to marginal-gain every aspect of the ride. From course selection and bike setup to tire choice, chain wax strategy, pacing by heart rate, and why a leaf blower might be his secret weapon, the crew breaks down how to get a self-described "card-carrying AARP member with a paunch" up 29,029 feet of climbing on a decade-old bike.
February 23 · 49 min
Rethinking Bidons with Bivo and Carina Hamel
Most of us hardly give those water bottles in our cages a second thought. It's plastic. It's there. It's got what we need. But in the late 20-teens, Carina Hamel and her partner started giving those bidons and second thought. And a third. And a fourth. And like a lot of new ideas, they thought, "There's got to be a better way." Their critical thinking led them to develop Bivo Bottles: stainless steel bottles that fit properly in bike cages. Since late 2020, Bivo has been trying to convince cyclists that they are better off with a metal bottle than plastic. They've made progress but the ride has not been smooth. First came Covid, which delayed their launch and stalled their grassroots marketing campaign. Then just as they started getting momentum, along came massive tariffs which threatened to end Bivo altogether. But Bivo is still here and as of this episode, celebrating a five year anniversary. We talk to co-founder Carina Hamel about their ideas, innovations and a chance run in with a NASA engineer.
February 9 · 46 min
AJA #48: Travel Kits, Drop Bar Drama, and Rants About Beeps and Boops
Josh answers listener questions about essential race-day gear, from what to pack for Cape Epic to whether digital torque wrenches are worth the beeping. We into Lifetime's controversial drop bar ban at Leadville, exploring whether safety concerns justify the change and what aero options remain for marginal gainers.
January 21 · 1 hr 3 min
Getting AiRO with Ingmar Jungnickel
For most of us getting into a wind tunnel is but a dream. Tunnels are hard to find and harder to afford. As an alternative Josh has recommended the Chung Method. It's proven yet it does take some expertise to get right. What if there were something in the middle? Something that is more accessible and less expensive than a wind tunnel yet doesn't require the hours of commitment and trial and error of field testing? Our guest believes he has just that. AiRO may sound like a company that is trying to latch onto the "AI" craze. But its founder, Ingmar Jungnickel, has been into cycling aerodynamics long before Chat GPT became a thing. He has a degree in engineering, he's developed on-bike aero hardware, and he worked for Specialized where he logged many hours in that company's wind tunnel. All of that, along with a chance opportunity to work with speed skaters, led him to develop a CFD program that attempts to make cycling aerodynamics more accessible. Ingmar's back story includes meeting are own Josh Poertner. But the real story here is how good Computational Fluid Dynamics has become. The potential of AiRO and its data even blew the mind of Josh as you will hear in this episode of Marginal Gains.
Dec 22, 2025 · 57 min
AJA #47: Aluminum Velodromes, Forever Chemicals, Big-Wheel Aesthetics, and valve stem nerdery
This Ask Josh Anything grab-bag starts with Tucson's new aluminum velodrome, evolves (devolves?) into altitude hacks for hour records, "no-rules" speed dreams, and holiday gift picks. From buying a kid's first bike (and why chain waxing might be the cleanest parenting win) to ESG-minded shop habits, Roubaix wheel diameter fever dreams to, aero brake-hose routing, and the Clik Valve debate—this episode covers the weird, practical, and wildly opinionated. Happy Holidays!
Dec 8, 2025 · 57 min
Melisa Rollins: From Hand-Me-Downs to Leadville Champ
Fatty sits down with 2024 Leadville champion (and his daughter) Melisa Rollins to discuss her meteoric rise from riding borrowed bikes to the professional peloton. Joined by fitter Barry Anderson, they dig into the biomechanical challenges of world-class power, the dangers of athletic stoicism, and the chaotic reality of stage racing in Africa.
Nov 7, 2025 · 55 min
AJA #46: Safety Pins, TPU Wins & Indoor Suffering
Josh tackles why we're still pinning race numbers instead of printing them on jerseys, then dives into the tech story behind Silca's translucent TPU tubes. We talk about real-world marginal gains for everyday riders, and Fatty's recommendations for indoor training setups. Last but not least, you do NOT want to miss Josh's unfiltered take on the UCI–SRAM 10-tooth cog controversy.
Oct 23, 2025 · 1 hr 1 min
32er Test Ride with Daniel Yang
We rarely chase trends or product announcements on the Marginal Gains Podcast. The news of the day we mostly leave to other shows. So allow us while we make an exception to our normal behavior and take a stab at the 32 inch wheel. The wheel size is not the new thing here. It's the tire that's creating some buzz. A viable, tubeless mountain bike tire to be precise. When Maxxis started showing its 32 inch Aspen, bike builders took notice. Some fired up their CAD programs to see if they could make it work. Using heat and steel, drawings were then turned into something rideable. One of those designers is Daniel Yang. Yang MFG and Neuhaus Metalworks have produced the Nova; a mountain bike buit around the 32 inch wheel. Steel, fully rigid, geared or single speed. We met up with Daniel on the trail and took the Nova for a test ride. After, we sat down at a park picnic table for a discussion on what it took to fit these wheels into a frame, who this bike is for and who it is not for and what could be mountain biking's next big move.
Oct 3, 2025 · 58 min
AJA #45: Pump Accuracy & Cheap Carbon Parts
Hear why that "psst" when you pull the chuck is just hose air (not lost PSI), how to set smarter pressures for tandems and "big-butt" weight splits using a bathroom scale, and what tread actually grips on loose-over-hard. Josh also demystifies analog vs. digital gauge accuracy (and drift) and tackles the carbon-on-the-cheap question—when a bargain is fine, and when it's a dentist bill waiting to happen.
Sep 22, 2025 · 59 min
Best Bike Split Founder Ryan Cooper
Marginal Gainers are familiar with Best Bike Split -- the website where using rider data you can forecast a finish time on a specific course. It has been a great tool for years for amateurs and pros alike. Josh has frequently referenced BBS on the show. Fatty and Hottie have discussed it on their Leadville Podcast. But we wanted to know what is under the hood. For that we turn to its founder Ryan Cooper. Before Best Bike Split, Ryan was a lot like us: a competitor with the hopes of going faster. Unlike most of us, he's really good at math. His ability to come up with equations and sus out variables gave him the tools to invent Best Bike Split. But the inspiration was more of an experiment -- a story will leave for him. In the interview, Ryan shares what he can about how BBS comes up with its forecasted times. He also talks about some new features he has in the works like factoring in tarmac conditions to better hone in on times. Ryan also wants listeners to get a taste of BBS and he is extending a discount to listeners of the pod. Use the code MARGAINS25 for a discount and as Ryan says: Race smarter. Ride faster. Win more.
Sep 2, 2025 · 59 min
AJA #44: Hookless Controversy, Tire Myths, and Aero Hacks
Josh tackles the fallout from his viral "hookless is a scam" comment, clarifies the real risks and physics behind hookless rims, and dives deep into tire pressures, gauges at altitude, and disc wheel aerodynamics.