Alchemy brings its expertise in high-end carbon to the Arktos: Alchemy’s full-suspension mountain bike in the form of tube shaping and layups that target stiffness and strength where needed, as well as durability that stands up to the rigors of aggressive trail riding. It has 6 inches of travel, 27.5-inch wheels and pretty typical trail bike geometry. 

“The platform was super stiff and efficient while keeping the wheels in contact with the ground for excellent traction. Now, about the descents…I did my best to pick the roughest lines and made a conscious effort to lay off the brakes whenever possible. The result: a super grounded, solid feel, even through washboard sections and over awkward, eroded lines cutting across the trail.”

Jeff Barber,

“With the Arktos’ Sine Supsension it climbs better than any bike in its category and descends like a monster. If I had to pick one mountain bike to ride all over Colorado, it’d be the Arktos every time.”

Logan Vonbokel, PR Alchemy Bicycles



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Arktos | Carbon Fiber Full Suspension

The Arktos Custom is made by Alchemy in Denver, CO and features a new dual-linkage platform called Sine Suspension that Alchemy licensed exclusively from David Earle. The name Sine derives from the way the shock rate, when graphed, resembles a sine wave: It’s regressive through the first part of the travel to absorb small bumps and provide climbing traction; progressive in the middle of the stroke to avoid wallowing on big hits or in hard, fast corners; then slightly regressive again in the last 15 percent of the stroke to enable the bike to use all 6 inches of its rear-wheel travel. Sine is also designed to minimize chainstay growth when the bike is moving, which is intended to help with pedaling efficiency and keep the suspension active under braking.
Built with the future in mind, this bike is compatible with a 1x drive train and 650b wheelset. Internal routing for the brakes, shifter, and dropper post keep this bike looking sharp. The frame and Fox Float X is $3,799. Included is a 2 color stock paint scheme choosing from Alchemy’s 15 stock colors. The stock sizes S, M, L, and XL are sure to fit anyone looking to be the talk of the town.


  • Wheel Size: 650b/27.5”
  • Max Tire Clearance: 2.4″
  • Boost 148 mm rear spacing
  • Travel: 150mm / 6”
  • Fox Float X shock
  • Fork: 150-160mm compatibility
  • Bottom Bracket: 73 mm threaded
  • Seat Post: 31.6
  • Headset: IS41 Upper – IS52 Lower
  • Drive Train: 1x
  • Eye-to-eye: 215.9mm
  • Stroke: 64mm
  • Suggested Sag: 30%
  • Chainring clearance: 38t (need 3mm offset ring for Sram Eagle)
  • Chainstay length: 438mm
  • 2-tone paint, 15 paint color options
  • Custom paint option
  • Bearings: Enduro 2 pieces BB 3930 LLU 6 pieces BB MR 21531 LLU MAX


Small Medium Large X-Large
Seat Tube Length 420 455 483 518
Effective Top Tube 585 600 615 642
Head Tube Lenght 100 110 115 130
Head Tube Angle 66 66 66 66
Frame Stack 589 599 604 614
Frame Reach 401 415 431 448
Seat Tube Angle 73.5 73.5 73.5 73.5
Chain Stay Length 438 438 438 438
Bottom Bracket Drop 10 10 10 10
Estimated Bottom Bracket Height 346 346 346 346