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BMC Fourstroke FS01 - 2012
The BMC Fourstroke FS01 belongs in an exclusive group of elite suspension bikes that push or break the 4.5lb barrier. Each shares a few key traits: short-travel, race-inspired, and made of carbon fiber. Even fewer have high-performance rear suspensions, or elegant good looks. At just 4.4 pounds, and by using BMCs proprietary Integrated Skeleton Concept (ISC) frame design, the Fourstroke FS01 has it all in spades.
The FS01 uses unidirectional carbon fiber throughout. There is no cosmetic layer of woven fabric on the exterior to mask sloppy craftsmanship during the layup process. The unidirectional fibers on the Fourstroke hide nothing, and serve to showcase BMC's attention to detail and the fine execution in their construction. Unidirectional carbon is notoriously difficult to work with, but is advantageous since each layer can be oriented so that the fibers are perfectly aligned to distribute stresses in the frame as outlined by the Finite Element Analysis (FEA) in the design lab. By doing so, BMC makes the frame as light as possible, while retaining strength and stiffness where it's needed most.
Stroke is controlled using BMC's patented Advanced Pivot System rear suspension. It's essentially a mini-link rear suspension that creates a floating pivot. The forged aluminum links are purposely short to eliminate unwanted lateral flex, and they provide a union between the carbon fiber front and rear triangles using sealed cartridge pivot bearings. The placement of the upper and lower linkages creates a fine balance between bump sensitivity, stability (resistance to bobbing or effect from rider weight shift), and their desired leverage ratios. And by positioning the floating pivot relative to the chainrings, the APS suspension maintains the efficient pedaling characteristic that world class riders demand from a high-performance trail bike. The Fourstroke delivers 100mm of race-ready rear wheel travel damped by a Fox Float RP2 shock. It's air sprung and has an external adjustment for rebound damping and a two-position (on or off) ProPedal lever for adding low speed compression damping if needed on long climbs or non-technical terrain. The APS rear suspension is active throughout the travel range, accomplished by BMC's insistence on a nearly linear wheel rate. So although you'll get a suspension that is tuned for maximum acceleration and traction, it still yields the full 100mm of travel should you need it. The net result is a bike that soaks up bumps beautifully whether youre at full gas, coasting, or braking.
The BMC Fourstroke FS01 includes a 31.6mm BMC Tuned Compliance Concept seatpost and requires a direct-mount, traditional bottom-pull front derailleur. It is disc-specific and uses a post mount for the rear caliper using threaded barrels that slide into the dropout, which protects the frame from unwanted damage in the event of over-exuberant wrenching. It has a 73mm bottom bracket shell, and 135x10mm rear axle spacing. It includes an integrated FSA Orbit CF Hiddenset style headset with a 41.8mm o.d. x 45 drop-in cartridge bearing. It is recommended for use with a 100mm fork, although a 120mm fork can be used and would serve to slacken the head angle by just under one degree " providing it a little more stability on washed-out or steep descents. The claimed weight is 4.4 pounds (1990 grams).
The BMC Fourstroke FS01 Frame - 2012 is available in the sizes Medium and X-Large and in the color Red.
Price: $1199.99 (65% Off!)
Regularly: $3499.00
Buy Now
The BMC Fourstroke FS01 belongs in an exclusive group of elite suspension bikes that push or break the 4.5lb barrier. Each shares a few key traits: short-travel, race-inspired, and made of carbon fiber. Even fewer have high-performance rear suspensions, or elegant good looks. At just 4.4 pounds, and by using BMCs proprietary Integrated Skeleton Concept (ISC) frame design, the Fourstroke FS01 has it all in spades.
The FS01 uses unidirectional carbon fiber throughout. There is no cosmetic layer of woven fabric on the exterior to mask sloppy craftsmanship during the layup process. The unidirectional fibers on the Fourstroke hide nothing, and serve to showcase BMC's attention to detail and the fine execution in their construction. Unidirectional carbon is notoriously difficult to work with, but is advantageous since each layer can be oriented so that the fibers are perfectly aligned to distribute stresses in the frame as outlined by the Finite Element Analysis (FEA) in the design lab. By doing so, BMC makes the frame as light as possible, while retaining strength and stiffness where it's needed most.
Stroke is controlled using BMC's patented Advanced Pivot System rear suspension. It's essentially a mini-link rear suspension that creates a floating pivot. The forged aluminum links are purposely short to eliminate unwanted lateral flex, and they provide a union between the carbon fiber front and rear triangles using sealed cartridge pivot bearings. The placement of the upper and lower linkages creates a fine balance between bump sensitivity, stability (resistance to bobbing or effect from rider weight shift), and their desired leverage ratios. And by positioning the floating pivot relative to the chainrings, the APS suspension maintains the efficient pedaling characteristic that world class riders demand from a high-performance trail bike. The Fourstroke delivers 100mm of race-ready rear wheel travel damped by a Fox Float RP2 shock. It's air sprung and has an external adjustment for rebound damping and a two-position (on or off) ProPedal lever for adding low speed compression damping if needed on long climbs or non-technical terrain. The APS rear suspension is active throughout the travel range, accomplished by BMC's insistence on a nearly linear wheel rate. So although you'll get a suspension that is tuned for maximum acceleration and traction, it still yields the full 100mm of travel should you need it. The net result is a bike that soaks up bumps beautifully whether youre at full gas, coasting, or braking.
The BMC Fourstroke FS01 includes a 31.6mm BMC Tuned Compliance Concept seatpost and requires a direct-mount, traditional bottom-pull front derailleur. It is disc-specific and uses a post mount for the rear caliper using threaded barrels that slide into the dropout, which protects the frame from unwanted damage in the event of over-exuberant wrenching. It has a 73mm bottom bracket shell, and 135x10mm rear axle spacing. It includes an integrated FSA Orbit CF Hiddenset style headset with a 41.8mm o.d. x 45 drop-in cartridge bearing. It is recommended for use with a 100mm fork, although a 120mm fork can be used and would serve to slacken the head angle by just under one degree " providing it a little more stability on washed-out or steep descents. The claimed weight is 4.4 pounds (1990 grams).
The BMC Fourstroke FS01 Frame - 2012 is available in the sizes Medium and X-Large and in the color Red.
Price: $1199.99 (65% Off!)
Regularly: $3499.00
Buy Now
