The Proterra Light i27 is a wheel for everyday trail use. Your bike that does it all deserves a wheel that does the same. The 27mm internal rim width hits the sweet spot in the width spectrum, providing optimal air volume and casing profile on tires ranging from 2.3 to 2.5. The open-bay rim profile eliminates weight where it's not needed. The flexible six-pawl hub provides 5 degrees of engagement for tackling technical climbs and provides instant power out of corners. Want to go wide with your downhill setup? Use: XC/Trial 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. Riders who routinely ride 2.3-2.5 tires often choose rims with a 27mm internal rim width for their balance of high-volume sidewall support and lightweight performance. Ideal for trials riders who prefer climbing or XC racers who prefer descending. 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.