Yeti SB120 - User Manual

The Yeti SB120 is a high-performance mountain bike frame designed for trail riding, featuring a full-suspension carbon fiber construction. It is engineered to provide a balance of efficient pedaling and smooth, supportive suspension performance, making it suitable for both beginner cyclists and seasoned pros. The frame incorporates Yeti's patented Switch Infinity technology, which is a key aspect of its suspension system.

Function Description:

The Yeti SB120 frame serves as the core component of a mountain bike, providing the structural foundation for all other parts. Its primary function is to offer a robust and responsive platform for off-road cycling. The frame's full-suspension design, specifically the Switch Infinity technology, allows it to absorb impacts from varied terrain, enhancing rider comfort, control, and traction. The frame is designed to accommodate 29-inch wheels and a 130mm travel fork, optimizing it for trail riding conditions. It supports a 1x drivetrain configuration, with specific chainring size compatibility, and is built around a 55mm Boost chainline. The frame also features an integrated headset and a Universal Derailleur Hanger (UDH) system, simplifying component installation and maintenance.

Usage Features:

The SB120 is built with several features aimed at enhancing the riding experience:

Switch Infinity Technology: This patented suspension system delivers 120mm of rear travel. It utilizes a translating pivot that automatically switches direction through the bike's travel, providing excellent anti-squat characteristics for efficient pedaling and ideal suspension performance deeper into the travel. This system is designed to be smooth and supportive, even on rough terrain.
High Modulus Carbon Fiber Frame: The main frame and swing arm are constructed from high modulus carbon fiber, hand-laid to create Turq Series frames. This construction ensures high stiffness and efficiency, contributing to a solid and aggressive feel on the trail. Carbon Series framesets offer similar stiffness and efficiency.
Internally Molded Cable Tubes: For hassle-free routing and a quiet ride, the SB120 features internally molded cable tubes. This design allows cables to be easily inserted at one port and exit precisely where needed, eliminating the frustration of fishing for cables and reducing cable rattle.
Floating Collet Axle System: The pivots utilize a floating collet axle system, which helps create a perfectly aligned connection between the front and rear triangles. This design allows the enduro max sealed bearings to move freely at the pivots, increasing bearing life and ensuring smooth suspension action.
Integrated ISCG-05 Mounts: For riders seeking extra drivetrain security on rowdy sections, the frame includes 2-bolt ISCG-05 chain guide mounts.
Custom Protection: The SB120 comes with custom downtube protectors and ribbed chain guards. These features decrease chain slap noise and protect the frame, allowing riders to focus on the trail. The nylon downtube guard provides protection where it's most needed.
Integrated Axle and Universal Derailleur Hanger System: Dedicated 12x148 boost dropouts are integrated with SRAM's Universal Derailleur Hanger (UDH), providing strength, stiffness, and ease of hanger and wheel installation.
Rattle-Free Cable Port Assembly: Clamping cable ports secure cables and hoses, ensuring a quiet ride, reduced cable movement, and a clean aesthetic. The ports are configurable to accommodate various cable or wireless components without leaving open housing ports.
Custom Tuned Rear Shock: The frame is designed with a custom-tuned rear shock, developed in Golden, CO, to optimize suspension performance and perfectly complement the SB120's kinematics. This ensures a balanced and responsive ride.
Integrated Tapered Head Tube: An integrated 41mm/52mm tapered head tube design allows for a larger head tube area, resulting in increased stiffness and a lower overall ride height without compromising performance.
Water Bottle Compatibility: The frame is designed to accommodate a standard-sized water bottle inside the front triangle for sizes MD-XXL. Smaller sizes (XS and SM) fit Yeti's 15oz Hot Lap and standard 21oz bottles, respectively, with a side-entry cage recommended for easiest access.
Dropper Post Compatibility: The frame supports stealth routing for dropper posts and is designed to accommodate various dropper post lengths, with specific minimum insertion depths and tire clearance considerations.

Maintenance Features:

The Yeti SB120 is designed with maintenance in mind to ensure longevity and consistent performance:

Switch Infinity Serviceability: The Switch Infinity mechanism features external grease ports, allowing for easy lubrication of the bushings and seals. Yeti and Fox Racing Shox recommend a lubrication interval of 40 hours of riding. Regular cleaning of excess dust and dirt is also advised.
Bearing Press Assembly: The manual provides detailed instructions for bearing press assembly for both the link and extender bearings, facilitating replacement when necessary.
Bearing Removal and Installation: Specific steps are outlined for removing and installing both V1 and V2 Switch Infinity bearings, including instructions for dust caps, axle sleeves, and bearing placement.
Torque Specifications: The manual provides a comprehensive list of torque specifications for individual parts and fasteners, emphasizing the importance of using a torque wrench for proper assembly and maintenance. This helps prevent over-tightening or under-tightening, which can lead to frame issues.
Maintenance Schedule: A schedule is provided for routine checks and maintenance tasks, including cleaning and lubricating the chain, checking tire pressure, cleaning the bike, checking brake function, ensuring cable end caps are covered, inspecting rims, checking for loose bolts, checking headset, inspecting/replacing brake pads, checking tire wear, checking spoke tension, and checking chain wear.
Authorized Dealer Service: Yeti strongly recommends that all service and repairs be performed by an authorized Yeti Dealer, especially for complex tasks, to ensure proper procedures and the use of specialized tools.
Prep Key: The assembly instructions include a "Prep Key" indicating where to use Loctite, nylon patch, or grease on bolt threads and parts, ensuring correct assembly and preventing loosening or seizing.
Rebuild Kits: Various rebuild kits are available for different frame components, such as link and shock extender bearings, nylon downtube protectors, SB120 protector kits, Switch Infinity V2 bearings, cable port kits, AXS conversion kits, Fox linear bearing V2 kits, frame protector sheets, frame plug cable port kits, shuttle guards, and hardware rebuild kits. These kits simplify the process of replacing worn or damaged parts.
Lifetime Warranty: The frame, including the Switch Infinity, is covered by a lifetime warranty against manufacturing defects for the original purchaser, provided it is registered online and serviced by an authorized dealer. This commitment to quality underscores the frame's durability and ease of long-term ownership.