Josh Poertner Reveals The Bike Industry Secrets! | GCN Tech Show Ep. 307

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This week the GCN Tech show has a special guest, Josh Poertner, owner of Silca bike products and all-around bike tech genius! We probe Josh on the bike industry's hidden secrets, revisit the hill climb championships tech and debate bike stiffness. There is yet another groupset recall and some super hot and spicy cycling tech from Rouleur Live 2023!
00:00 Intro
00:41 Bike stiffness
09:54 Industry secrets
18:32 Hill climb championship
22:51 Brake systems
28:40 Hot tech
34:12 Comment of the week
38:20 Bike vault
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2 июн 2024

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Комментарии : 331

@gcntech 6 месяцев назад

Do you know any bike industry secrets? 🤫

@aihsanasl 6 месяцев назад

Foldable bikes suck as long as they don't fit in my wallet or pocket.

@hugobci 6 месяцев назад

Things bike telated are expensive just because. But dont tell it put loud. It is a secret.

@ashleyhouse9690 6 месяцев назад

On the point of frame stiffness, I'm sure I saw a YT video some time ago by one of the Swiss experts (SwissSide?) who were saying that a flexible frame did not contribute to any lost power which made a super-stiff frame pointless. The theory being is that the frame acts like a spring in as much as when you flex it one way, it gives you back any theoretical lost power on that stroke when you flex the other way on the other stroke. It seems like the same thing that Josh was talking about with the "skating".

@longdang2681 6 месяцев назад

What people objected to was that there was far too much emphasis on the bike being disc brake when it made no practical difference what braking system it used. The disc brake was given far too much credit for doing absolutely nothing to help Andrew Feather win that race.

@salimsanchez89 6 месяцев назад

Don't know of any bike industry secrets but I did want to ask about disc vs rim brake for carbon wheel applications in regards to Feather's winning bike setup. Wouldn't high end disc brake carbon wheels be lighter than their rim brake counter parts because of the extra materiel needed to reinforce the braking surface on a rim brake carbon wheel? The overall system mass may be less for rim brake bikes, however, the location of the masses in a disc brake wheel may result in better acceleration because the majority of that mass is in the center of the wheel and the outer portion (which greater effects the rotational mass) is lighter..? I may be over thinking or completely wrong but just a thought I had.

@philbailey2647 6 месяцев назад

LOVE Josh, what a extremely knowledgable and genuine guy. Really like the guests on the tech show!

@Adonis-qj1nq 6 месяцев назад

Agreed, discussions with him are always fascinating to listen to

@zygmuntthecacaokakistocrat6589 6 месяцев назад

You need your head read. He's a fake.

@mikhailway 6 месяцев назад

And he’s humble. He doesn’t claim to have all of the answers!

@samoalea1 6 месяцев назад

Josh finally said it, all discussions about advantages and disadvantages of disc brakes aside, they allow us to have only one bike that can run on different wheel and tire sizes which is a huge plus considering the current market prices for new bikes.

@01FozzyS 6 месяцев назад

I always like listening to Josh whenever you have him as a guest!

@gcntech 6 месяцев назад

That makes two of us! Josh is always so great to have on the show, the knowledge this man has 🤯

@MrGarycoww 6 месяцев назад

Love it when Josh turns up! THE William Shatner of bike geekery!😎

@chrisridesbicycles 6 месяцев назад

If you could bring Josh to the Global Bike Festival for a live show, that would be great.

@gcntech 6 месяцев назад

Ooooo now that's an idea! We're sure josh would love to go 🙌

@tonyBobb5209 6 месяцев назад

Love the Ribble Royal British Legion addition. As a former serving Royal Marine Commando this is nicely presented to remember the brave heroes who gave us the freedom we have to day, we could say this has given us the opportunity to be able to enjoy our lives, ride our bikes and spending time with friends in a country where the brave gave us the ultimate gift. Well timed Ribble with remembrance day upon us.

@TryHardIndustries 6 месяцев назад

Make the dork disc really big and it's basically a disc wheel. Aero!

@jonathanellis1842 6 месяцев назад

As a smaller rider, stiffness can be a real issue, smaller frames are stiffer to begin with, and tubes are often not size specific also. This can make a small bike very uncomfortable, even when a review often done on a larger frame size says that the bike is a good one!

@gcntech 6 месяцев назад

Super interesting point! Have you tried going for a steel frame? Something that naturally will flex a little more.

@DB-sj8km 6 месяцев назад

I’ve thought previously that smaller riders would benefit from endurance frames more. Not mention titanium and high end steel frames.

@jonathanellis1842 6 месяцев назад

Toe overlap is a problem also, as a shorter reach - top tube and a tight front centre are the stuff of nightmares, this can be more of a negative on small framed endurance bikes.@@DB-sj8km

@Stirling1989 6 месяцев назад

Ollie is loving getting into the nerdy details. Alex is answering his emails! Great show guys. Love it. #morejosh

@gcntech 6 месяцев назад

That's normally how it goes with these two! 👀

@elvisg7 6 месяцев назад

I always love when Josh Poertner is on the show. They're may favourite, so munch knowledge.

@DjCringefest 6 месяцев назад

*Pourtner

@jbratt 6 месяцев назад

Early 2000s I mixed dirt with some grease to stop a seat post from slipping while in a ride. When I got back to my garage/shop I used course grit lapping compound like one would use on car valves. I told someone on I bike forum what I used and another guy really took exception and called me a few names for what I had come up with. Stupid was one of them.

@markanderson5559 6 месяцев назад

Alex & Ollie doing their best Bevis & Butthead "stiffness huhhuhhuuhu"🤣

@jamescarlphotography4523 6 месяцев назад

Josh's point at 24:40 regarding expense is well taken as many stock bikes today do come with high end wheels, etc. is well taken -- and it's one of the reasons why I never, ever bought a "ready built" high end bike back in the day. You would inevitably get compromises on headset, bar, wheels, stem, etc., even on the high end bikes. Much less expensive to pick your frameset, group, contact points kit and select wheels all separately and build up yourself. Heck, before the advent of assembled high end wheelsets, one of the fun parts was picking hubs, rims, spokes, lacing pattern, etc. for the use.

@estelja 6 месяцев назад

Josh's "skating" concept when it comes to frame stiffness is what Jan Heine from Rene Herse cycles has discussed quite a bit as "planing". It makes sense that you'd want the flex resonance of your frame to match your force input.

@gcntech 6 месяцев назад

Jan Heine ... Someone else to get on the show? Sure we could all learn something about the supple life 🙌

@Pellagrah 6 месяцев назад

Would it then follow that excessive flexing cause the same issue as excessive stiffness? Meaning the force input is no longer synchronized with the flex resonance? I wonder if that also means that the amount of stiffness that's best for a rider rolling along at 150 watts is different than a rider punching out 300 watts? And this is all assuming that rider form remains exactly the same regardless of frame stiffness. I'd expect to see more biomechanical inefficiencies (i.e. wasted energy) as the frame becomes more/less stiff than the human body, since even our bones will flex a small amount while peddling. Would be hilarious if we have to know our bone mineral density before getting a bike fit 20 years from now, just saying.

@kailashblades 6 месяцев назад

Josh is describing skating the frame flexing to align the wheel better- reducing tyre scrub and potentially getting better load path also. This isn't the same thing as planing. Note that Josh says he has a theory- he thinks that there's portions of our understandings that are missing and that we're not getting the complete picture. That more research needs to be done before any knowledge can actually be gleaned. This is the appropriate outlook to have for someone using science to better understand things. Jan heine has beliefs and preferences that he uses the authority of science to justify without the proper ethos. He picks and chooses from his own results, performs very small scale and limited experiments that he then draws grand conclusions on, fills in the gaps in his data with whatever feels right to him at the moment and ignores the results of other testing unless it fits his pre existing views. Its at best pseudoscience and at worst deceitful marketing. Don't give him a platform any larger than he already has.

@a1white 6 месяцев назад

Totally agree on stiffness. My road bike is a 720 Reynolds steel frame with 25mm tyres. I firmly believe the reason tyres have got fatter and fatter is because frames have got stiffer. My bike rides fine over rough surfaces because the frame has natural compliance, without the big fat tyres.

@gcntech 6 месяцев назад

Yet mix an steel frame with wider tyres and you've got a dreamy riding bike? 🙌

@mattmatthews5414 5 месяцев назад

Man, I’ve felt like I was insane telling my LBS guys that I hate my stiff 853 & carbon bikes and have been putting 10k’s of miles on my Tange #2 & 531 bikes the past 3 years. Thank you for confirmation/affirmation.

@IamPapaShaw 6 месяцев назад

Josh always drops the knowledge on Gavin and Ollie.

@Desmond17 4 месяца назад

Hey that's Ollie Marriage from Top Gear at 32:27, in the background on the Ribble stand. That's a cool surprise, two Ollie for the price of one !!

@brannmacfinnchad9056 6 месяцев назад

I'm with Josh on the black components. The pop of silver is gorgeous and should be an option. One of the mandatory parts of my last build was silver...I had to go back to Ultegra 6603 to get the look and gearing I wanted.

@gcntech 6 месяцев назад

Silver is always classy 👌 Silver and black makes for a great looking bike!

@brianeberly3279 6 месяцев назад

Josh is such a cool and down to earth guy. So much knowledge and such a nice guy.

@gcntech 6 месяцев назад

He's always so fun to film with! We just sit back and soak in all that knowledge!

@clayfit1 6 месяцев назад

The French magazines all hated the superstiff German bikes made for Tour magazine- they said they were lifeless. Some flexibility was needed to give a frame snap and elasticity. Now Specialized claims that a certain lateral compliance in the Aethos design helps the handling. Whether or not that’s the reason, I know that my Aethos makes my S-Works Tarmac SL5 feel like a truck.

@chrisridesbicycles 6 месяцев назад

Being German and an engineer, I can only explain this obsession with that we want to look rational and don‘t want buy our technical toys based on „feel terms“ like „lifeless“. We need a NUMBER. My dad is 300% this customer in Germany.

@mikebull9047 6 месяцев назад

This guest is another level

@richardmamelok5571 6 месяцев назад

Cervelo made their most recent R5 less stiff than it previous iteration because the pro racers asked for that.

@Ale_BR 6 месяцев назад

Great show. Josh is amazing. I love his concept of mental models. Stiffness or flexibility of the frame is fine tuning art.

@christianndasilva1843 6 месяцев назад

I've waxed my chain since the last time Josh was on the show!

@jestag2 6 месяцев назад

23:10 Now we have proof that wheel manufacturers are over pricing disc carbon wheels when the fact is they are using cheaper priced resins while the old rim brake carbon rims have the most expensive resins that are more expensive than the carbon itself.

@darrenburbury5505 6 месяцев назад

@gcntech, seriously I think the Hillclimb championship proposed would be epic. GCN+ coverage, weekend tickets to ride and huge spectatorship, all the tech (and therefore sponsorship). If it goes well it could even turn into a world tour. Full on party atmosphere and events. Maybe at the next GCN summer event at Saalbach!?!

@hinrichaue7199 6 месяцев назад

Josh is becoming a bike vault expert! The man is a man of many talents!

@brucevelo1 6 месяцев назад

Always great to hear from Josh.

@alexjquispetorres4909 5 месяцев назад

I see!🙌

@AbnerRios-cq2qn 3 месяца назад

Excelente entrevista

@JustMikeH 6 месяцев назад

The conversation about stiffness reminded me of a video from Path Less Pedaled regarding tire pressure. When research was done by racing teams regarding ideal tire pressures they found the ideal tire pressure was entirely counter-intuitive. Additionally our own sensory input of what tire pressures feel faster to us is also opposite of the data. I think Josh's comments about our mental models for compliance and stiffness nailed it. There is a lot of room for research and learning.

@chrisgerman-rb7cb 6 месяцев назад

interesting conversation. We tend to obsess over things that can be measured (weight, stiffness), often to the detriment of the unmeasurable.

@frankharradence732 6 месяцев назад

Best show ever...great entertaining watch

@larryt.atcycleitalia5786 6 месяцев назад

An adult among children for 42 minutes.Thanks Josh!

@xosece 6 месяцев назад

Josh is always a pleasure to listen to. While I am a newbie, listening to him gives me hope to improve every day, which I am doing. Btw, used to MTBs I purchased my first ever road bike, Triban RC 120 street fighter style (flat bars) and had a spoke protector that was a pain to remove! It also included two reflectors and lights.

@user-sb3qg5ph5t 5 месяцев назад

I have a TON of fun going FAST on a stiff bike as well as the security knowing the thing isn't going to collapse on me 😊 Well, now that I think about it, the wheels HAVE to be stiff. I had trouble with that on the original Mavics that came with my bike. The frame has some (enough) give in it to offer up enough of a decent ride comfort level 👌 👍 👏

@triathlonsteve9675 6 месяцев назад

Great show guys, josh a real character and full of fun bike knowledge 🤩

@aaronedgeart 6 месяцев назад

Josh Poertner returns, bless 'em!!!!!!!!!

@user-cx2bk6pm2f 6 месяцев назад

Gerard Vrooman is almost as interesting as Josh Poertner, and that's a huge compliment. You two, with these two, plus Si for good measure... indeed MEGA SHOW!!

@davidhughson189 6 месяцев назад

Ollie, Josh has EXCELLENT hand movements in describing, He “upped” your “hand movements “ game. Still your chemical engineering still TOPS Josh’s!

@MarcoSimoneGili 6 месяцев назад

Mood GAP! Sorry to see how Edrick and Josh are all jolly and having fun VS. Ollie must have had 'one of those days' 😢 Jokes apart, great job guys! ❤ Love your vids and all of you presenters, thank you and all GCN crew for all you do for us! 🤩

@57ebartley 6 месяцев назад

When I was still racing almost 15 years ago I had the pleasure to ride a few top end bikes. Some of the bikes I rode had frames that were so light they were noodles. What I noticed is they rode like butter but were really hard to accelerate over 30 miles an hour and I never thought it was cool to look down on a climb and watch my bottom bracket going back and forth.

@DeveryAndrews 6 месяцев назад

I run a Silca waxed chain and started using an accurate tire pressure gauge along with Silca’s recommended tire pressures and must say my average speed on the bike has increased dramatically with these two simple additions.

@jesmondo5785 6 месяцев назад

I am currently use a drip on wax lube which I love. Have been considering waxing when I next replace my chain. Don't suppose you have any experience with all weather commuting?

@gcntech 6 месяцев назад

Whoop whoop! That's what it's all about 💨Are you a full waxed chain convert now?

@jameskellogg1162 6 месяцев назад

I remember when I came away from motorcycle racing and started racing bicycles in 1990 riding on a Klein sponsored team , super light and really still was the thing . And very few did that better than Gary Klein . I remember the UCI trying to keep Klein out of the pro peloton with rules that bicycle tubing could only be so big . How much money did the UCI take from all the steel frame builders ? Klein was finally able to compete but only after Trek had bought the company and all technology patents and of course most of the European brands had started using big aluminum tubing . What a 140 pound pro considers stiff versus a 180 pound strong rider considers stiff can be drastically different

@NolbertosolanoDelgadocab-gc2rx 3 месяца назад

Excelente explicación

@rupertmcleod4198 6 месяцев назад

Tech Show + Josh = Great episode

@margothzumaetaoyarce6935 3 месяца назад

Espectacular

@LuisemilioPabloraul-hb9rl 2 месяца назад

Increíble show

@HarweyRengifo-fg8vl 3 месяца назад

Grandes amigos

@dblissmn 6 месяцев назад

#1; Feather and Laverick as pointed out are sponsored. #2; it gets very tough for most people to justify specialty setups, e.g. rim brakes for climbing, disc for general purpose, fixed gear for errands, hybrid e-bike for recreation etc. #3, this was a bad day for weight weenie-ism and that was probably a good thing.

@sintiarominadelaguilaijuma3143 4 месяца назад

Buena entrevista entre compañeros

@jameslee-pevenhull5087 6 месяцев назад

Stiff frames vs flex? Reynolds 853 was the Box Deluxe. Pronounciation. "Five, Three, one." "Seven, Five, Three." "Eight, Five, Three."

@YohanTorres-tt1yx 2 месяца назад

Excelente video genial 😁 👍

@gigantografiaslizarbe4447 4 месяца назад

Excelente enseñanza

@davidblackburn1672 6 месяцев назад

I'm absolutely gutted, I love your longer GCN Plus stuff especially KoM hunters

@gcntech 6 месяцев назад

Thanks David, we hoped this would never happen and we are gutted to be announcing it today - if you're looking for any further information, please visit: gcn.eu/gcnplusclosing

@EderNilsonValco-fn5bp 2 месяца назад

Grandiosos, buen diálogo

@KarenPerezcachique-tl5oj 5 месяцев назад

Excelente

@danielalongapardo9138 3 месяца назад

Very nice video

@zwiftingwithdemonhunter 5 месяцев назад

I want to see someone like Primoz Roglic show up on the starting line for the TdF with a dork disc on his back wheel. 😁

@tertiaryeel2066 6 месяцев назад

Week 35 of asking for a “the UCI has no jurisdiction here” T-shirt

@jonm8423 6 месяцев назад

Pedal pushers apparel😊

@jojoadeyemi8239 6 месяцев назад

😂 But why? They literally partner with the UCI to broadcast their races.

@hotsky83 6 месяцев назад

Lol doesn't look like it's gonna happen if it's been 35 weeks

@JayLato 6 месяцев назад

Never give up.

@SamuelLudden 6 месяцев назад

@@JayLatonever surrender!

@brannmacfinnchad9056 6 месяцев назад

Sooo....if Alex didn't puncture. And the support vehicle was only a KM or so down the road... WTH didn't Alex go and pick up the repair stuff?

@alexpatonGCN 6 месяцев назад

Did you not see the state of me at the end of the lap, I didn't need to be adding in extra KMs!

@brannmacfinnchad9056 6 месяцев назад

@@alexpatonGCN I suppose that's a fair point, lol. But then you'd have the addition excuse of having ridden further than Ollie!

@OlegsKop 6 месяцев назад

That the moment when Silca decieded to produce carbon softener for too stiff bikes.

@6ft8incyclist 6 месяцев назад

Todays stiff frames are much better, the old frames(steel) in my younger strong days. I would be out of the saddle or climbing hard your can hear and see the front derailleur, rubbing hard on the chain ring and chain. You can look down and see the bottom bracket flexing. I love my CADD10 now. Just a small movement on hard climbs.

@jascollinscork 6 месяцев назад

Cracking show! Went on about hill climbing for too long for my liking though 🤷

@nerigarcia7116 6 месяцев назад

BMC Kaius is there gravel race bike, looks very much like a Team Machine. They're super nice.

@lissyestefanycarballomoren4719 3 месяца назад

Good vídeo

@Cristhyan-gi4lj 3 месяца назад

Son estupendos

@treyquattro 6 месяцев назад

great insight from Josh, but the most beneficial aspect was increasing the size of the Bike Vault Supreme Court to three judges. That's a much more fair option than only two.

@izi941 6 месяцев назад

21:40 yes you could. Cyclocross bikes were a thing already before Discs. Tho, max 45mm tyres.

@pgn666 6 месяцев назад

Cyclocross is max 33mm

@galenkehler 6 месяцев назад

You could only do that with cantilever brakes, which had their own set of performance and safety issues.

@marfitagonzales7259 4 месяца назад

Fantastico

@jorgeluismendeztantalean-ps3vi 4 месяца назад

Muy buen video

@graemejwsmith 6 месяцев назад

Oh and let's go here..... Paul Smith bike prompted this thought: Matt paint is faster than gloss on an aero bike. The matt keeps a boundary layer of air attached to the tube in laminar flow better than gloss. (well it does on airplane wings). Discuss.....

@andrewhayes1339 6 месяцев назад

Congrats to Alex & Chloe, but honestly & apologies to Alex, your wife is a natural for GCN. Would love to see Chloe start doing a few GCN tech & network shows with Manon. 👍

@derf9465 5 месяцев назад

As for flex, when I was racing in the late 90's with New Forest cycling club we had a rider who was over 6ft tall on a steel garden gate frame and before the start he pointed out to us all at the start that his seat tube and cracked and become detached from his bottom bracket. I set off before him but the swing must have been massive, he finished in a good time for a 10 back then. So flex must work, i think he rode it for a while after.

@markpeterson8978 5 месяцев назад

Carbon Dork disks will sell. There are people that will buy and install anything carbon. Wonderful show Boys. Cheers - M

@Bikefixers 6 месяцев назад

Hi Guys, During this video you mentioned a Recall From SRAM regarding aftermarket 12 Speed Shifters. Can you advise where you got this information from as I have just checked the SRAM website and there is no mention of it there. Or is this just a case of the Media trying to drum up some fake news.

@patrickstuart3326 6 месяцев назад

Great show. Need to fix the camera focus, as the wall of tools is tack sharp but the speakers and their laptops are blurred.

@ShawnIsBatman 6 месяцев назад

Great to see Ollie getting a second interview to be the next lead chemist for Silca!

@gcntech 6 месяцев назад

He's not for sale 👀

@ambarperez444 2 месяца назад

Muy buena Josh

@JEKYLLHYDE123 6 месяцев назад

It's like tyre pressure higher pressure does not equal more speed. Just like more stiffness will no always equal better performance

@williamschultz8198 6 месяцев назад

Silka tee shirt with BMW 2002!

@RicardoRocha-lg1xo 6 месяцев назад

Whisky and Velo Orange make a fork and rim brakes that can accomodate 35mm tires, so the tire size argument is only partially valid. Production costs? I can see that with respect to carbon disc brake wheels in general (which I'm fine with) and particularly with hookless rims (which I avoid like the plague).

@Thezuule1 6 месяцев назад

I have a hybrid Diamondback that's super compliant with the frame and you can feel it and it's fun as hell to ride. Between the bendy frame and the wide bars when I get up out of the saddle and it almost feels like I stole the elliptical machine from the gym and put wheels on it. There's just a flow to it that my TT bike doesn't have.

@Joelchy1955 2 месяца назад

Que buen video

@henrymoyetones3673 2 месяца назад

Buen producto

@elguiye_20k 4 месяца назад

Perfecto

@john_7986 6 месяцев назад

With 1 joke about spoon brakes, you have solved the problem of no more caliper brakes. Someone needs to design carbon spoon brakes that squeeze between the tire and the frame 😂

@stuartdryer1352 6 месяцев назад

Not just dork discs. Ceramic bearing dork discs. $$$$$. I should be in the bike industry.

@MarjorieLirielApazaReyes-pb7nc 3 месяца назад

Bonitas bicicletas 😎

@maxsievers8251 6 месяцев назад

There are good rim brakes that wrap around 42 mm tyres and mudguards or even 54 mm tyres and mudguards. Look at Rene Herse's offering. But rim brakes only really work on aluminium rims. So if you want to use carbon rims you should go with disc brakes.

@bitchoflivingblah 6 месяцев назад

ollie: it has to be the titanium Ribble, it has everything I want in a bike, all I would need in addition would be Josh's three sets of wheels and then I'm literally set for life. In fact that's how Ribble should sell the bike, with a minimum 2 sets of wheels, road and gravel (and/or with a front wheel dynamo). I would lack for nothing.

@SteeR.DianderasB.-qx8wv 3 месяца назад

Good 👍

@katerineshapiama272 5 месяцев назад

Buen video

@mattmatthews5414 5 месяцев назад

swapping wheels < swapping bikes. Just have a rigid 26er and a road bike.

@nazarethzuanare1062 4 месяца назад

Amusing

@raptorcita5035 2 месяца назад

Muy Buenos

@Kaiserfa 6 месяцев назад

Working in the field of tribology, a rubber vs. carbon fiber resin braking system is just a massive bodge to me. You just can't get the heat out and you have to make ridiculous and costly compromises to get it working to some extend. Something I'd never even consider riding.

@SimonMartin-tz5ii 6 месяцев назад

Great comment from Josh regarding black components, I fully agree. Also, I think a lot of new bikes look ugly, that BMC is hideous