RIDENOW RACE FORMULA TPU 19g Inner Tube (for Disc Brakes Only) Why choose RIDENOW Race Formula 19g? 🚀 Lightest in Class: Weighing just 19 grams, this is the most cost-effective weight reduction upgrade. It significantly reduces rotational mass for the fastest possible responsiveness. 🏆 Secret Formula to Victory: Designed specifically for racing, it reduces rolling resistance, allowing you to ride faster and save energy. 🛡️ For Disc Brakes Only: Designed and manufactured specifically for use with road bikes with disc brakes for maximum performance and safety. 💪 Tough and Durable: Despite its ultra-lightweight design, the TPU material remains tough and highly resistant to punctures, reducing worries about flat tires. 🎒 Small and Compact: Folds down to 50% smaller than a regular inner tube, ideal for carrying as a spare tire on race day, saving space.