What tire and tire pressure you choose can have a huge impact on your speed. In this video I sit down with Josh Poertner of Silca to discuss how to determine the optimal tire pressure, what makes a tire fast or slow, and whether or not tire inserts increase rolling resistance. Find your optimal tire pressure with the Silca Professional Tire Pressure Calculator: https://silca.cc/pages/sppc-form Find out which tires are faster or slower with BicycleRollingResistance.com: https://www.bicyclerollingresistance.com/ The Marginal Gains Podcast: Interested in coaching? Shoot me an Email at info@ignitioncoachco.com Training plans are now available on Trainingpeaks: https://www.trainingpeaks.com/coach/dylanjohnsontraining#trainingplans WWBHDD? T-shirts and stickers: null Patreon: https://www.patreon.com/backwardhatdylan Jukebox: https://www.jukeboxprint.com/ Flow Formulas Nutrition: https://flowformulas.com/collections/all Bikenetic Bike Shop: https://www.bikenetic.com/ Starlight Apparel: https://www.starlightapparel.com/ Kask Helmets: https://www.kask.com/ Follow me on Instagram, Twitter, Facebook, and Strava for more content: Instagram: @dylanjawnson Twitter: @djdylansjohnson Facebook: Dylan Johnson Cycling Coach Strava: https://www.strava.com/athletes/207526