When the ground breaking OPEN frame, the OPEN O-1.0, hit the scene in 2012, the cross country mountain bike world got a taste of what advanced composites and an obsession with design could create. The O-1.0 remained the lightest production hardtail frame for several years, and is still lighter than nearly all hardtails offered by the competition today. Four years later, the dynamic German powerhouse has built on the success of the O-1.0 and created the next generation of ultra-lightweight, ultra-versatile mountain bike frame, the OPEN One+ Frameset.
The OPEN One+ shares the O-1.0’s uber-clean esthetic and is actually similar in weight, but that’s where the similarities end. While OPEN likely could have shaved additional grams of frame weight, the advancements in the One+ focus on stiffness and versatility. Gerard Vroomen (known in road-circles for his work creating Cervelo) knows a little something about carbon fiber, and applies the latest knowledge of materials and tube shaping to the One+. The frame’s downtube and chainstays are massive, giving the OPEN its incredible power transfer. The seatstays, however, are pencil thin, creating additional flex for the 27.2 seatpost. In addition to dramatically shaped tubes, Open uses an optimal blend of various types of composites (such as high AND low modulus carbons) to perfect stiffness, ride quality, impact resistance, and strength. The result is a beautiful riding frame that’s meant to be ridden. And ridden hard. And at 890 grams, the One+ is as light as it gets.
The latest industry standards are applied to the OPEN One+ Frameset, including a BB92 bottom bracket, which moves the bearings as wide as possible (92mm wide, to be exact). This increases crank stiffness and also allows for a wider downtube and chainstays. The move to BB92 also allows the One+ to use nearly every standard crank on the market, including Shimano XTR and Sram Eagle, without the need for adaptors. The One+ also moves away from a standard quick release rear end in favor or a 12mm Thru-Axle. While many hardtails are still using the 12×142 standard, OPEN opted for BOOST 12×148 hub spacing, which creates a stiffer and stronger rear wheel. BOOST, along with dramatic chainstay and seatstay engineering, allows the One+ the versatility to not only run a big 29″ tire, but also the latest 27.5″ Plus tires.
With its roots set in high-performance XC riding, the One+ is designed around 29″ tires. With the big wheels, the One+ can run a 29×2.4″ tire, which is a lot of tire clearance for a hardtail. For additional grip, tire compliance, and just plain fun, the One+ will also accept a 27.5″ x 3″ Plus tire. In terms of traction, Plus offers a significant improvement over more traditional tires sizes, making it great for loose dirt, sand, and for less-technical riders looking for the fun and challenge mountain biking offers. And because the overall tire diameters are nearly identical, the OPEN One+ maintains the nearly the same bottom bracket height and geometry, so there are no compromises to the handling. The end result is an incredibly fun bike to ride, and being an OPEN, is also extremely light and efficient.
The OPEN One+ Frameset comes in a matte Black finish, in sizes Small, Medium, and Large. * NOTE: the Small One+ is designed for a standard 27.5″, or 26″ Plus tire, to ensure safe and comfortable fit. Frame weight for a Medium is 890 grams. Open includes the a headset, seatpost collar, ThruThread dropouts, and Syntace X-12 rear thru-axle. Contact us at email@example.com for additional info about the frame or custom build pricing.