most seamless action

features pockets positioned for easy access while riding a bike

The Ultegra Cassette uses the HYPERGLIDE + technology to provide a smooth shifting in all gears and under load

・Compact design includes an integrated wireless unit

delivering exceptional comfort and cooling performance when temperatures rise

sram chain red e1 flattop silver 12 13 speed Product Type_ Bottom Bracket most seamless actionSRAM's RED E1 Flattop chain delivers precision engineering for modern 12 and 13 speed drivetrains. The flattop design reduces weight while maintaining exceptional strength and durability. Silver finish resists corrosion and complements contemporary groupsets. Engineered for smooth, reliable shifting across the entire cassette range, this chain maximizes power transfer and minimizes drivetrain noise. Ideal for road cyclists demanding professional grade