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Mountain Cranksets & Crank Arms

SRAM XX1 Eagle Boost SL 12-Speed Crankset

SRAM's Eagle drivetrain system sets a new benchmark for range and effectiveness with a 1x drivetrain due to an amazing 10-50 12-speed cassette. The XX1 Eagle is top of the line with improvements across the board. The XX1 Eagle 12-Speed Crankset features premium SRAM carbon construction for lighter weight with durability and stiffness that erases the need for XC and Trail versions. This crankset includes the 12-speed compatible Direct Mount X-SYNC™ 2 chainring for frames with a Boost 148mm rear thru-axle, which necessitates a 52mm chainline. SRAM's goals with XX1 Eagle was to build an XC drivetrain with a combination of simple functionality, light weight, highly efficient and quiet operation and long lasting performance. Carrying over the concepts that have made SRAM's mountain drivetrains so popular, such as the X-ACTUATION™ trigger shifter design, 1:1 cable pull ratio, and X-HORIZON 1x optimized rear derailleur system, you get tried and true technology that has been refined and maximized for XX1 Eagle.

The DUB crank axle and bottom bracket system is known to be light, stiff, with lower friction and more balanced power transfer. Combined with the Eagle system and Direct Mount chainring, the XX1 Eagle Boost SL 12-Speed Crankset is an ideal set-up. Thousands of hours of wear evaluation from 11-speed 1x chainrings helped SRAM to evolve and re-engineer the X-Sync tooth profiling, and this second generation has some serious new shaping and teeth that hold the newly designed Eagle chain perfectly, at any and all angles, in any ring and cog combination. All Eagle chainrings install with SRAM's Direct Mount system, which makes installing or changing rings simple and fast, and delivers an incredibly stout interface that is carried through the machining of the entire ring. This particular XX1 Eagle Boost SL crankset comes with the Boost 52mm chainline version of the ring. Please keep in mind that with SRAM, Boost spacing in the rear triangle is 148mm wide, a proper chainline is created with a 3mm offset that SRAM builds into the ring itself. If you need to replace for this 52mm chainline, you buy the Boost version, and if you get a frame that has standard spacing all you have to do is get the standard 49mm chainline ring..

The 28.99mm crank axle requires DUB bottom bracket cups, of which SRAM offers several options for the various frame shell designs. In order to build the carbon crank arm assembly to receive the axle within the direct mount zone of the driveside arm, and still meet the lightweight, stiff and efficient requirements, SRAM employed a new internal hollow core carbon architecture and overall carbon design referred to as Carbon Tuned. A new carbon lay-up was devised to find the right balance, and the internal structure augments the stiffness of the arm shape, as well as adding durability.

Every aspect of the SRAM XXX1 Eagle Boost SL 12-Speed Crankset has extraordinary finish and quality construction you'd expect in SRAM's top line cranksets. Performance is flawless, and regular SRAM 1x riders will be surprised at how quietly the new ring and chain function, with zero-drop reliability. Running an XX1 Eagle with Boost 148mm rear spacing? Ready for a 34T ring and 10-50 or 10-52 cassette? We have the ultimate crankset for you. XX1 Eagle soars above expectations. Will you take flight with it?

Features

  • Eagle 12-speed carbon crankset with DUB BB interface, Boost, direct mount Eagle ring
  • Evolved crank-arm design optimized for cross-country and trail applications
  • CARBON TUNED™ crank technology provides extreme stiffness and light weight
  • Chainring technology is designed specifically for Eagle™ chains and drivetrains
  • X-SYNC™ 2 chainring has quieter performance, better mud clearing & durability
  • Special hollow internal architecture of arms ensures strength despite low weight
  • DUB 28.99mm crank axle, requires frame specific DUB bottom bracket
  • Direct mount chainring feels solid on crankarm, set up for Boost 52mm chainline
  • Crank lengths, with 34T Boost ring: 170mm, 175mm
  • Colors: Grey