Justin Cary’s RAT 1000 FKT, Caleb’s Broken Valve Stem, and the Science of Dextrose | ShiftLess Ep. 121

This episode is a masterclass in the highs and lows of ultra-endurance racing. We’re dissecting the final days of the Race Across Texas (RAT), from Justin Cary’s reality-shattering 4-day record to Caleb’s heartbreaking mechanical in Tulia. Plus, we dive into the "sugar lab" to settle the debate on fueling for 1,000 miles.In this installment, the crew regathers to process a chaotic RAT week. We track Matt Golson’s final push near the New Mexico border and relive Caleb’s 800-mile journey that ended with a freak mechanical: a snapped valve stem. We talk about the "Goldilocks" Airbnb experience in Electra, the terror of mountain lion tracks on the Red Roads, and why a $5 spare part is the most important thing in your kit.We also go deep on the numbers behind Justin Cary’s new FKT (96 hours, 21 minutes). How does a human ride 1,000 miles in four days on almost zero solid food and only four hours of sleep? We break down his high-concentrate "Hummingbird" fueling strategy and the science of simple vs. complex carbohydrates.In this episode, we cover:RAT 2025 Recap: Tracking the "ITT" riders and the grueling 64-mile stretch from Russell’s to San Jon.The Tulia Heartbreak: Caleb breaks down the freak accident that snapped his valve stem and the 10-minute Tyvek nap that saved his sanity before being rescued by a "company man."The "Sugar Lab": Maltodextrin vs. Dextrose. We explain the difference between simple and complex chains, why Justin Cary uses fructose, and the vital role of sodium citrate in preventing gut shutdown.Wildlife on the Red Roads: Fresh mountain lion tracks on top of bike tires and why the "Ozark Trail" marker is a beautiful place to accidentally fall asleep.Industry News & Lawsuits: Strava drops its lawsuit against Garmin. We discuss the "winner and loser" in the data war and Apple TV’s exclusive 2026 F1 deal.2026 RAT Announcement: Kevin reveals plans for an official RAT Stage Race with cumulative timing, semi-supported bin options, and 110-mile daily targets.Race Promoter Drama: A "spicy" preview of the Texas Race Promoter Symposium in Waco.Forget the "bro science"—we’re talking about the gear and the glucose that actually gets you across the finish line.Race Across Texas, RAT 1000, Justin Cary FKT, Maltodextrin vs Dextrose, Garmin Strava Lawsuit, Ultra Endurance Cycling, Bikepacking Nutrition, Broken Valve Stem, Texas Gravel, ShiftLess Podcast.To understand Justin Cary’s 4-day run, you have to understand how the body processes different sugars. Dextrose provides an immediate "hit," while Maltodextrin offers a steadier, multi-glucose chain burn for long-distance efforts.Caleb, since that broken valve stem officially ended your run, have you already added a handful of spare stems to your saddlebag, or are you betting that lightning—and bad metallurgy—won't strike the same spot twice in 2026?EXPERT GUIDEWould you like to focus more on the technical specifications of the 2026 supported stage race or the specific sodium ratios we discussed for heat management?KeywordsThe Energy Lab: Simple vs. Complex CarbsReach out and touch us: [email protected]