Show notes
In this week's episode, Randall has Josh Poertner on to talk aerodynamics. In a wide-ranging conversation, the two touch upon Josh's time as Technical Director at Zipp, involvement in the development of computational models for rotating wheels, early collaboration with Cervelo founders Phil White and Gerard Vroomen, founding and leadership of the product brand Silca and The Marginal Gains Podcast, and ongoing consulting work with elite athletes and teams. Silca Website Marginal Gains Podcast Episode Sponsor: Logos Components Support the Podcast Join The Ridership Automated Transcription, please excuse the typos: Silca - Josh Poertner [00:00:00] Craig Dalton: Hello, and welcome to the gravel ride podcast, where we go deep on the sport of gravel cycling through in-depth interviews with product designers, event organizers and athletes. Who are pioneering the sport I'm your host, Craig Dalton, a lifelong cyclist who discovered gravel cycling back in 2016 and made all the mistakes you don't need to make. I approach each episode as a beginner down, unlock all the knowledge you need to become a great gravel cyclist. This week on the show, I'm handing the microphone back to my co-host Randall Jacobs. Who's got Josh Portner, the CEO of Silka on the shout out a wide range in conversation about the sport and high performance. Many of you may be familiar with the storied Silka brand. It's been around for close to a hundred years. But josh took over back in 2013 with a mission of merging the highest quality materials and craftsmanship with cutting edge design and manufacturing When you visit the Silca website, you notice a tagline, the pursuit of perfection, never settling, always improving. And I think that embodies how Josh approaches the sport. . So I'm excited to pass you over to Randall to dig into this conversation. Before we jump in i want to thank this week sponsor logos components Yeah, I've been itching to get back on a set of six 50 B wheels, and I've been waiting for my logo's components, wheels to arrive. They literally just arrived last night and I'm super stoked. But yet disappointed because I have to go away for the weekend and I won't be able to actually ride them until sometime next week. I chose the Atara six 50 B model. As you know, I'm sort of big on the big tires, big fun philosophy. So I've been eager on my unicorn, which I've been riding on a 700 SEASET for a while now. To get into the six 50 bees again and see what a six 50 by 50 combined with that rock shock fork is going to yield for me on the trails here in Marin. You guys may remember. Me sitting down with Randall, talking about what makes a great gravel wheel set and everything that went into these logos component wheels. I encourage you to go back to that conversation because whether or not the logo's wheel set is for you or not. I think Randall does an excellent job of teasing out. All the various considerations. You should be having when considering buying a gravel wheelset, It is no small expense when getting into a carbon wheel set, but the team at logos has endeavored with their direct consumer model. Uh, to make it as affordable as possible and make them as durable and high performing as anything out there on the market. I written wheels designed by Randall for the last three years. So I'm super excited. To see his latest vision come to fruition. With these new wheels and I'll have them underneath me soon enough. I encourage you to check them out@logoscomponents.com. Randall's also an active member of the ridership community. So if you have questions for him, feel free to join us over there at the ridership and connect with other riders. I seen people paying that their wheels have arrived so you can get some real, real people answering your questions. About whether they're enjoying the wheelset and how they perform, et cetera. And I'll have more on this in future additions. At this point. I'm going to hand the microphone over to Randall. And i hope you enjoy this conversation with josh [00:03:30] Randall: Josh Portner, thank you for joining us on the podcast. This is a conversation I've been looking forward to for quite some time. Some deep bike nerdy is probably about to ensue, so, uh, let's dive, let's hope. Dive right into it. [00:03:43] Josh: Well, thank you for having me. Always, always up for some deep bike. Nerdy. I like that. [00:03:49] Randall: So a number of our listeners will already know who you are, but just give folks a high level summary of what you do now. [00:03:55] Josh: Oh gosh. So I own Silca, um, or I own Arrow Mind, which, uh, owns the Silca brand and trademark, um, and, and all that that entails. And then we also have a, uh, we own Marginal Gains, which is a podcast and a YouTube channel. And, um, Yeah, our goal is to, a mind works with a lot of pro riders, pro teams, world tour teams. Um, you know, we do everything, Excuse me. We do everything from, you know, performance consulting, uh, modeling, uh, you know, setting up our record attempts for people or, or helping them design our record attempts. Um, you know, we do tire pressure work with pros. We do equipment choices for teams. We think some of the most interesting stuff we do, um, is around where like, uh, teams or national federations don't trust the equipment they're getting from somebody. And they'll come to us and say, you know, the, you know, bike brand X says that this does this, and our writers don't think so. Can you tell us what's true? And. We'll find a way to make that happen. So we, we've had some pretty interesting ones of those with, uh, particularly around the Olympics with the national federations. You know, no, nobody wants to have another Under Armor speeds skating suit, uh, situation, , right? Where all the, all the athletes think something is true and therefore it becomes true and, and nobody knows. And so, um, you know, so we do a lot of that. Arrow mind does that, essentially. And so that's a lot of the performance work I was doing in my old world. I was technical director at ZIP for almost 15 years. Um, and, and then Silca is the product arm of the company. Uh, that's probably how, you know, most people know us. You know, we make pumps and tools and, and, but we also make a lot of crazy things that people look at me and go, Oh, where the hell did that come from? Well, that probably came from some project or another. We did it in the Arrow Mind side of the business, Um mm-hmm. . So that's how we've gotten into sealants and lubricants and 3D printing and, and all sorts of other craziness. Right? That's sort of how the one flows into the other. And then, you know, Marginal Gains is a podcast and, and YouTube channel where we talk about it all and, and we, we typically with a, a team or a company have like a two year. Secrecy period on a technology. And then after that we can do something with it and, and talk about it and tell the story. So, you know, it's always, it's always fun to go through those periods where like, Oh, thank God we can talk about that now, . Cause you know, we're talking about it internally all the time. And, and you're like, Oh, can we put that in the podcast? I don't know. So, so that, that's what I do now. We, I, I play with bikes basically. [00:06:34] Randall: Very, very cool. And, um, when you talk about the consulting work you do, is this kind of full stack performance consulting, is it very a focused, is it all technical sides, including say, like bearing drag or, or things like this? Is it, um, obviously positioning falls into Arrow Nutrition. Like where, where do you, ooh, where does your domain physiology start? [00:06:57] Josh: And I draw the line at physiology, you know, there's a whole, there, there are people who are, are like my equivalent in that world. And, and my God, I can never even dream to. You know, clean their shoes. So, um, no, you, you need someone to talk physiology, you know, And I'll, I'll pull my phone out and we'll call Allen Li or somebody, you know, Yeah. With a bunch of contacts. But, uh, you know, Alan's one of my favorite go-tos for things like that and be like, Oh dude, I've been over my head help . You know, [00:07:21] Randall: he, he's, um, he's actually been on the pod before, but Craig interviewed him, so I might bring him on in the future to do, you know, my, my more kind of nerdy type of interview. Alan's great. Yeah, no, [00:07:31] Josh: he's, he's a lovely guy. He's a lovely guy. And, and I just love, I mean, he, you know, like I find myself pretty quickly sometimes getting into places where people's eyes just glaze over, like, what the hell is this guy talking about? And, you know, I love that Alan can do that to me in about 30 seconds, you know, we're talking about the stuff that he does. You're like, Oh, whoa, shit, way over my head way. I, I didn't even recognize the last four words that you used in that sentence, . And, uh, so it's, it's awesome to be able to be surrounded by people with that. But no, you know, we. The stuff that they come to us for. I mean, you know, when I left sip and started soak, of course everybody and their brother, you know, came and said, Oh, design us a wheel. I'm like, well, like I can't do that for a couple years. But also I'm kind of just done with that, you know, like I've lived that life. I, you know, it, it was fun. But, you know, we, we continually updated wheels for 15 years, but it, it really is kinda like doing the same thing over and over again, you know? And, and so it just wasn't fun for me. So, you know, they'll come and say, um, you know, help us design this cockpit, or we, we do a lot of, with our, our in-house, uh, 3D titanium printing, we do a lot of custom cockpits for, uh, teams, riders, things like that. You know, where we laser scan the rider, get the position, lock that down to the wind tunnel, design the part, 3D print it, um, you know, stuff like that, that, that's really exciting. We, we'd get a lot of, you know what, um, You know, help us optimize for this time trial at the tour or the Olympics or whatever, where, you know, what tires should we run and we can, we have systems and tools and, and spreadsheets and a million other things that we can, um, Yeah. Help, help them determine. And then a lot of times we, you know, we get companies coming to us, um, really just wanting to know, like, you know, if, like, which of their sponsor products should they use and when should they go off sponsor? You know, you'll see that a lot at like, the tour where, excuse me. Um, you know, like they, they ride the sponsor correct product, you know, 98% of the time, and then they're gonna sneak it in here or there when it's really critical. So, you know, what, what are those really critical points? And then, you know, if, if they're gonna risk getting in trouble or outright get in trouble, like it needs to be worth it, right? And so they might come to us with like, okay, you know, we need. I need a time trial tire for this rider for this day. You know, what should we do? And, and we'll help him with that. But yeah, you know, if you, if you were a, a brand, uh, or a world tour team there, or approach our athlete that wanted to go to the win tunnel, you know, you might pay us to come along. Um, a lot of what I do too is kind of fun is just act as like a fly on the wall in these team to sponsor interactions. You know, I think I was probably at half a dozen wind tunnel tests last year where I really had pretty much nothing to contribute other than being the neutral third party in the room, um mm-hmm. you know, so that everybody was comfortable that everybody was. Comfortable . [00:10:26] Randall: Well, I would imagine there's a mix of the, uh, the political, if you're talking about, you know, what should be using our own sponsors gear versus slipping something else in all the way to, um, balancing the competing goals of say, like comfort and pure power output on the bike versus aerodynamics. Um, if you're talking about a time trial position. Yeah. [00:10:47] Josh: Oh yeah, for sure. And, and I think even down to, you know, and I think as much as we love to talk science and testing and, and try to be as scientific as possible, I mean, this stuff is really, it's emotionally hard. It's politically hard. It's, you know, companies will bring new equipment in, they're with their engineers. I mean, those guys and girls want that stuff to work so bad. And you know, sometimes you just see things coming out where, Oh yeah, that's clearly faster. And you're like, Well, actually, the way I would interpret that is it's probably about. The same, um, or mm-hmm. , you know, let's, let's rerun that test or, um, you know, it's always, I don't know, it, it, they, they like, people like to get themselves in these loops where, you know, Oh, we did this and it's 10 seconds faster and it's that, And I feel like back in the, you know, when I was with zip, we did this a lot during the Lance Armstrong area and he was writing our disc and, and we were coming in as consultants for the first probably five tours or whatever. And um, you know, every wind tunnel test you'd get to the end and they would have this chart that's like, we just made him 90 seconds faster. And it's like, look guys, that. There is no 90 seconds faster. I mean, you know? Mm-hmm. like, like that is not gonna happen. You know, you, you just did a whole bunch of stuff that's not sustainable that he can't hold his head like that. Mm-hmm. that helmet tails gonna come off the back, you know, I mean, cuz he, people do things like, Oh, oh, the helmet tail moved, rerun. You're like, Yep guys, when you ride in the real world, like the tail's gonna move. Like you don't, you know, people like to, they select data, um, without even realize they're selecting data. And so, you know, it is, it's just good always to have a third party in the room. Um, you know, it's kinda like funny story, you know, back to, you know, my zip days, how Firecrest came about, you know, Firecrest was literally the name of the prototype that, that kind of blew all of our minds. And the reason the prototypes had weird bird names was that we had to double blind them across engineers because you just didn't want anybody. Kind of, you know, having an effect on their product, right? I mean, we all, you know, we all fall in love with our children, right? . And, and in this world, like you, you can't love your children. Um, and you have to be willing to kill them when they're not good. And, um, you know, we would do this double blind thing where we would like assign them all a number and then we would assign bird name, these bird names a number, and then we would randomize it and then they would get all put up. And then nobody really knew whose idea was what, when you were in the tunnel. Um, that's necessary, right? Cause you're, you know, you can be your own worst enemy at that stuff. I think we've, you know, we've all been guilty of that a time or two in our lives. But, uh, you see it all the time, particularly in these performance, um, improvement coaching type things where, you know, people just wanna will something into existence even when it's not. Yeah. [00:13:38] Randall: Well, and I can see, um, you know, the marketing oftentimes has it much more, uh, presented, much more like a, you know, this is just, it's physics. It's more, it's more exact, it's more…
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