- Experience seamless shifting with our advanced 6 and 7 speed indexed SIS system, featuring an optical gear display for quick and accurate gear position verification. - The "3F" designation signifies our Friction Front shifting mechanism, designed for responsive performance in varied riding conditions. - The "3I" designation indicates the Index (SIS) Front SL-TX50 mechanism, combining precision with effortless operation to enhance your cycling experience. - This product is sold as a pair, providing a complete solution for both front and rear shifting needs. - Key Benefits: - Smooth and reliable shifting: The indexed SIS system ensures quick and precise gear changes, improving your efficiency on any terrain. - Easy gear identification: The optical display allows for immediate confirmation of your current gear, minimizing distractions while riding. - Versatile functionality: The 3F and 3I mechanisms cater to a variety of performance needs, making it suitable for casual riders and competitive cyclists alike. - Compatibility: Designed to integrate seamlessly with a wide range of bike models, ensuring enhanced performance without the hassle of complex installations. - Use Scenarios: - Daily commuting: Navigate city streets with confidence, shifting effortlessly between gears to tackle diverse landscapes. - Weekend cycling: Enjoy long rides or challenging trails, knowing your gear transitions will be smooth and dependable. - Competitive racing: Gain the advantage with rapid and accurate shifts, keeping you focused on your performance. Upgrade your cycling experience with our indexed shifting system, and enjoy the blend of precision, reliability, and ease of use.