The SRAM XS-1299 T-Type Eagle 12 Speed Cassette represents the pinnacle of drivetrain technology, engineered to elevate your riding experience to new heights. A critical component of the Eagle Transmission system, this cassette delivers unparalleled shifting performance, both inboard and outboard, even under the heaviest loads. The harder you pedal, the better it shifts, thanks to the full X-SYNC design that ensures each gear change is smooth, precise, and reliable.

This cassette is not just about performance—it’s also about cutting-edge design and engineering. The first nine gears are crafted from fully machined, hardened steel using SRAM’s X-Dome architecture, providing exceptional strength and durability. The final three gears are housed in an ultra-lightweight, all-aluminum Spider Cog, making the XS-1299 the lightest Eagle cassette SRAM has ever produced.

The massive 520% gear range is perfect for tackling any terrain, from steep climbs to fast descents. The 52-tooth cog offers improved gear progression, with 44 and 38-tooth cogs that provide smoother transitions between gears. This cassette is optimized for a 55mm chainline, ensuring more moderate chain angles, longer wear, and greater precision.

Designed as an integrated part of the Eagle Transmission system, the XS-1299 T-Type cassette works in perfect harmony with the derailleur, ensuring flawless alignment and unmatched performance on every bike. Installation is a breeze, thanks to the clearly marked Setup Cog, making this high-performance component accessible to every rider. With its innovative design, robust construction, and lightweight materials, the SRAM XS-1299 T-Type Eagle 12 Speed Cassette is the ultimate choice for serious riders who demand the best from their equipment.

Features

• Advanced X-SYNC Design: Optimized for the best-ever inboard and outboard shifting performance under load. The harder you pedal, the smoother and more precise the shifts, ensuring you maintain momentum and control in all conditions.
• Ultra-Lightweight Construction: Combines fully machined, hardened steel X-Dome architecture for gears 1-9 with an all-aluminum Spider Cog for gears 10-12, making this the lightest Eagle cassette ever, without sacrificing durability or performance.
• Massive 520% Gear Range: Provides a versatile 10-52T range that’s perfect for conquering any terrain. Whether you’re powering up steep climbs or sprinting on flat sections, you’ll always have the right gear for the job.
• Optimized Gear Progression: Features improved gear steps on the low end with 52, 44, and 38-tooth cogs, delivering smoother transitions and a more efficient pedaling cadence, reducing fatigue on long rides.
• 55mm Chainline Compatibility: Designed for a more moderate chain angle, resulting in longer drivetrain life, enhanced precision, and consistent performance across all gears.
• Integrated Transmission Design: Engineered as an interdependent component with the Eagle Transmission derailleur, ensuring perfect alignment and seamless operation, for a flawless riding experience every time.
• Easy Installation with Setup Cog: Includes a clearly marked Setup Cog for fool-proof installation, making it easier than ever to achieve optimal performance right out of the box.
• XD Driver Body Utilization: Compatible with the widely accepted XD driver body, ensuring easy integration with existing setups and providing broad compatibility across different wheel systems.

Technology

X-DOME

X-DOME technology creates an incredibly lightweight, precise and strong cassette. The open design aids in mud clearance, giving you cleaner shifting performance and longer component life.

X-SYNC

SRAM X-SYNC 1x chainrings provide the highest level of performance and durability. The SRAM X-SYNC tall square teeth edges engage the chain earlier than traditional triangle shaped teeth. The sharp and narrow tooth profile, as well as rounded chamfer edges, help manage a deflected chain. To provide the best possible performance in muddy conditions, the X-SYNC chainrings have been designed with mud-clearing recesses for the inner chain links and rollers. Engineered in Germany, X-SYNC rings are an integral part of the SRAM 1x drivetrain. Accept no imitation.

Eagle

Eagle technology represents our newest 1x drivetrain technology. Eagle is a lighter, simpler, more durable, and easier to use drivetrain. Eagle features all-new 1x components, engineered for even greater durability and performance while maintaining a significant weight advantage over other drivetrain solutions. Eagle technology also provides an expanded gear range of 520%, which is equal to 2x11 drivetrains.

Specifications