State Bicycle Co. Semi-Internal Routing Stem System

Clean Looks. Simple Setup. If you're running a fully internally routed frame but don't want the headache of a fully integrated cockpit, the Semi-Internal Routing Stem System gives you the best of both worlds. Designed specifically for bikes using an IS52 headset system, this stem allows brake hoses and shift housing to enter the frame through the headset while keeping your handlebar setup traditional and easy to service. That means cleaner cable routing, easier maintenance, and compatibility with a wide range of standard handlebars. Whether you're building up a new bike or upgrading your current cockpit, this system delivers a sleek, modern look without locking you into proprietary components. Features Semi-internal cable routing design Compatible with IS52 headset systems Works with fully internally routed frames while maintaining a traditional handlebar and cockpit setup Compatible with standard 31.8mm handlebars Includes routing spacers and headset top cap for a complete installation Durable CNC-machined 6061 aluminum alloy construction Clean black finish Available in 90mm, 100mm, 110mm, and 120mm lengths Specifications Material: 6061 Aluminum Alloy Stem Angle: -7° Stack Height: 30mm Steerer Tube Diameter: 28.6mm (1-1/8") Handlebar Clamp Diameter: 31.8mm Lengths: 90mm, 100mm, 110mm, 120mm Color: Black Weight: 172g–201g (varies by size) Included Semi-Internal Routing Stem Headset Top Cap Cable Routing Spacer Kit Installation Hardware Compatibility Designed for frames utilizing an IS52 upper headset standard, including our Carbon Road and Carbon All-Road platforms, as well as many modern road, gravel, and all-road bikes from major manufacturers that feature headset-based internal cable routing.