Rocky Mountain Flatline Unlimited

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Rocky Mountain Flatline Unlimited

1 Review for Flatline Unlimited

  • + 1
 This is a freaking nice bike i wish i could afford it >. i would defenitly say it is better than a kona shred or cowan. ultimately it depends on what kind of riding ur gonna do.
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Avg: 5 (1 votes)
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Rocky Mountain Flatline Unlimited (MSRP $4199.99) — LC2R The Low Centre Counter Rotating - LC2R - patented suspension is a laterally stiff design that offers a highly predictable ride in all conditions. Its low sprung weight and concentrated suspension mass allow the LC2R suspension to respond faster to ground forces, such as stutter bumps, and keep the rear wheel glued to the ground during acceleration. LC2R suspension is a single pivot design, with the main pivot located just above and behind the bottom bracket. Both chain and brake forces are concentric to this pivot through-out the suspension travel, which eliminates pedal “bob” and brake jack. A thrust/ tug link engages the top link to create a rising rate suspension and the much-sought-after “infinite travel” feel. We tune LC2R to create an optimal suspension rate for different types of riding – from super cross country to Freeride and to downhill. * Linearly Rising LC2R suspension rate is tuned for freeride and downhill racing; suspension progression is inherent to the linkage design, not the shock absorber. * Concentric to the main pivot point, chain and brake forces eliminate pedal “bob”; suspension is stable during pedaling, and “platform” pedaling is inherent to the suspension design - not the shock. * Counter rotating top link creates a more laterally stiff Swingarm for increased control in tight corners, and the occasional sideways landing. * The counter rotating link along with the kinked down tube allow for a low and center positioning of the shock absorber in the frame. This low-slung concentrated mass allows the bike to rotate in any direction faster than if the center of mass was positioned higher in the frame. * Oversized double-row angular contact bearings increase bearing life, and allow for a less expensive bearing to be used. (more affordable for retail level replacement) * Triangulated Swingarm maximizes suspension strength, while keeping its weight to a minimum. * Tuglinks (as opposed to thrustlinks) increase suspension sensitivity to very small bumps, further aiding in smoothing out the trail. FORM Technology The heart of a bike is its frame. The geometry, the material, the feel, and the way it reacts under the rider are the very essence of the ride. That’s why we’ve introduced FORM™ – the design and manufacturing process of our high-performance frame tubing. Our philosophy behind FORM™ tubing is to push the limits of tube and frame design to create the frame’s unique riding feel. Engineered Ride Quality : FORM™ tubing is a line of high-performance tubes designed to elevate the superior ride quality for which Rocky Mountain Bicycles are known. Innovative design: With 25 years of innovation, we continue to push the boundaries of bicycle design. FORM™ tubing is the exciting new frontier of our creativity. Attention to detail: Every detail in a FORM™ tube set is carefully engineered and has a purpose: from the slightest variations in shape, to wall thickness, tapers, flares and bends. Uncompromised quality: FORM™ tube sets are manufactured with premium materials and delivered by the best suppliers in the industry to meet Rocky Mountain’s strict requirements. Floating Brake (For Flatline Only) • RMB Designed Floating brake system (available as an after-market purchase) removes the rear wheel braking force (brake jack) from the suspension action. • The floating brake caliper eliminates wheel inertia effects of applying the rear brake by allowing the brake to move indepently of the rear axle. • The floating brake caliper maintains a constant wheelbase length throughout all points of front and rear travel.

Specifications Compare to other DH Bikes

Release Date 2009
Price $4,200
Travel 170-213mm
Rear Shock FOX DHX 3.0 Custom Valved, 170-213mm
Fork Marzocchi 66 RCV
Headset FSA Orbit Z1.5 / 1 1/8
Cassette SRAM PG-950-9 11-32T
Crankarms SRAM Hammerschmidt FR 170-175mm
Chainguide SRAM Hammerschmidt FR 170-175mm
Bottom Bracket SRAM Hammerschmidt FR
Pedals RMB Flat
Chain SRAM PC951
Rear Derailleur SRAM X9.
Front Derailleur SRAM Hammerschmidt 2spd
Shifter Pods SRAM X9 Triggers 9spd
Handlebar RMB Alloy DH 31.8mm 30mm rise 700mm
Stem RMB DH alloy 31.8mm x 10° 50mm
Brakes Shimano BRM575 hydraulic disc
Hubs Wheeltech disc cartridge bearing W/12mm Thru axle
Spokes DT Champion
Rim Mavic EX325
Tires WTB Prowler MX 2.5 Comp FT / Dissent 2.5 comp RR A.V.
Seat WTB Pure V Race
Seatpost RMB SP-601 2-Bolt 30.9mm


Size XS M L S
Frame Weight
Bike Weight
Headtube Angle 64.6 ° 64.6 ° 64.6 ° 64.6 °
Seattube Angle 69.2 ° 69.2 ° 69.2 ° 69.2 °
Headtube Length 101.6 mm 101.6 mm 101.6 mm 101.6 mm
Chainstay Length 457 mm 457 mm 457 mm 457 mm
BB Height
BB Width
Seat Post Diameter
Front Derailleur Width
HeadTube Diameter 1.5 1.5 1.5 1.5
Top Tube Length 558.8 mm 558.8 mm 609.6 mm 558.8 mm
WheelBase 1143 mm 1168.4 mm 1219.2 mm 1168.4 mm
Standover Height 711.2 mm 736.6 mm 762 mm 736.6 mm
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