The Proterra Light i23 wheels explore all the possibilities of a fast and lightweight wheelset. A 23mm internal rim width provides the optimal tire profile for road and gravel tires ranging from 30 to 42mm. Its open-bay profile features thin, weight-optimized walls that deliver the perfect blend of stiffness, compliance, and efficiency. Subtle graphics on a sandblasted finish ensure these wheels won't clash with the colors of your dream bike. We didn't skimp on the hubs either. Top-of-the-line EZO bearings, a fast-shifting 6-pawl hub, and 5 degrees of engagement deliver the look, sound, and feel you expect from a high-end tubeless setup. Use: Adventure / Gravel / Cyclocross The rims deserved to be paired with high-quality hubs, which further enhance the performance of this lightweight, reliable wheelset. Frequency hubs feature a low-friction 6-pawl design that alternates between two sets of 3-pawl groups to provide responsive 5-degree hub engagement. A durable nylon strip sits between the rim and the tubeless tape to prevent the tubeless tape from pressing into the spoke holes and ensures a smooth connection between the tire and rim. The smooth surface facilitates tire installation by preventing air from escaping around the bead with each indentation during inflation. The Solid Strip also protects the airtight system from punctures in the event of a broken spoke. Need assurance that your gravel wheels will be lightweight but still last through seasons of riding? Proterra Light i23 and i25 wheels offer long-term reliability thanks to their three-cross lacing. Bar end bikes with tires in the 32-40mm range are best paired with a 23mm internal rim width, while a 25mm internal rim width is best suited for the same bikes with 41-50mm tires. Choosing the right internal rim width for the tires you ride will optimize air volume and tire profile for your specific tire and rim combination. Proterra wheels are hand-built in our wheel manufacturing facility. Our team of wheel wizards assemble, tension, and wrap each Proterra with the same attention to detail they apply to their own wheels. This hands-on approach allows us to confidently stand behind our wheels as the most reliable on the market. TUBELESS COMPATIBILITY: TCS is our standardized rim/tire system for tubeless tires, designed to meet international ETRTO standards and deliver unmatched tubeless performance and reliability. TCS components reduce weight, increase traction, virtually eliminate punctures, and have established themselves as the most reliable tubeless system available. Our TCS system includes tires, rims, tape, sealant, and valves to provide a complete package of unmatched tubeless performance and reliability. Every Proterra rim uses our TCS (Tubeless Compatible System) and ships with Solid Strip, TCS tubeless tape, and black alloy valves installed. This means all Proterra wheels are tubeless-ready and sealant right out of the box. Reliable 6069 Alloy: Proterra rims are extruded from WTB's 6069 aluminum alloy for optimal strength, while a bead-peen finish and durable decals keep your wheels looking fresh. Our extensive testing has shown that other 6000 series alloys are less impact-resistant, while the stiffer 7000 series alloys produce a harsher ride and tend to increase flat spots. All of this ensures that WTB Proterra wheels deliver the compliance you expect on your first ride and the durability you expect on every ride.