Every second matters in cross country mountain biking, which makes every mechanical advantage critical. The 2019 BMC Fourstroke 01 FRS frameset delivers the ultimate performance on the most demanding courses. Designed to optimize speed, save seconds, and keep riders ahead of the pack.
The Fourstroke’s party piece is the Race Application Dropper (RAD) seatpost, which integrates a dropper seatpost into the frameset. The two-position 80mm travel is slightly less than the competition, but BMC claims it’s more than enough for XC applications. Additionally, BMC claims the proprietary oval shape improves stiffness by 30% and cuts weight by nearly 200 grams over an equivalent Fox Transfer dropper. What we’re most excited about? Not only is there no hydraulic parts to speak of in the ultrasimple post, but the RAD operates at nearly 90% lower air pressures than the industry-standard Fox Transfer as well. Low pressures means less stress on seals, greater reliability, and less necessary maintenance. We can get behind that.
What else is new? Progressive geometry, and lots of it. Previous Fourstroke had wheelbase, angle, and front-center numbers that aren’t too far off from a modern gravel bike. This new model moves to a considerably more progressive XC geo for greater control on descents. Combined with a longer front end, you’ll now find a 67.5° head tube angle, a steep 75.5° seat tube angle with 429mm chainstays, and longer reach than most of the competition as well
The basics are as good as ever with the Fourstroke 01. Like before, the Fourstroke 01 uses their Big Wheel Concept (BWC) philosophy to offer optimized geometry across all sizes in the 29er wheel size. BMC’s Advanced Pivot System (APS) makes another appearance as well. APS optimizes pivot locations for ideal kinematics and results in purposeful leverage ratios, axle paths, and shock performance characteristics.
Every gram counts in XC, and the new Fourstroke 01 uses fewer individual parts than before. A fully-integrated headset, a carbon pivot, a lighter one-piece carbon rear triangle, and improved internal cable routing make the bike much easier to maintain than before. All in, BMC reckons the Fourstroke 01 weighs just 2180 grams with a shock and hardware, and 2525 grams decked out with the RAD seatpost and hardware.
The 2019 BMC Fourstroke 01 FRS frameset comes with the RAD dropper seatpost, a Fox Float DPS Factory rear shock tuned to (100mm), a three-position lockout remote, and all necessary hardware. It is available in four sizes (S-XL).
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