Key benefits Reliable durability: Three-layer construction with a double-layer PVC outer shell and a heat-resistant alloy steel beam provides long service life and resistance to environmental wear. Consistently smooth shifting: A specially designed smooth PTEE inner tube reduces friction and cable wear so gear changes stay precise over time. Ready-to-install kit: Includes the cable pipe and fittings needed for a complete replacement or upgrade, saving time and avoiding multiple purchases. Wide compatibility: Works with road bikes, MTB bikes, folding bikes and common shifter types, including SRAM, so it fits many setups. What this cable set solves Eliminates crunchy, sticky shifts caused by worn or corroded cables by lowering internal friction and protecting the core with a robust outer layer. Prevents premature cable failure in hot or rough conditions thanks to the heat-resistant alloy steel beam. Simplifies maintenance and upgrades by providing a comprehensive package with conduit and rings for straightforward installation. Materials and key specifications Three-layer design: double-layer PVC outer layer + heat-resistant alloy steel beam + smooth PTEE inner tube. Pipeline size: 4 mm variable speed pipeline included. Package contents: 4 mm variable speed pipeline, front transformer inner wire, assorted conduit pieces, and rings for a complete installation. Performance highlights Low friction inner tube for smoother, more consistent shifting under load and over long-term use. Protective outer construction resists abrasion, moisture, and heat to maintain cable integrity in a variety of riding conditions. Compatible with common gear shifters including SRAM for broad applicability. Typical use scenarios Road cycling tune-up: Replace old cables to restore crisp shifting for long group rides and endurance training. Trail-ready MTB service: Install the set to improve shifting reliability and reduce the chance of cable failure on rough or hot trail days. Daily commuting or folding bike maintenance: Fit to folding or commuter bikes to ensure dependable gear changes for everyday use and quick repairs. Why choose this set Combines durable materials and low-friction design for dependable shifting performance. Designed for straightforward installation with the included inner wire, conduit pieces, and rings. Suitable across multiple bike types and shifter systems, including SRAM, enabling a single solution for different bikes.