Alchemy Arktos 27.5 Frame, 150mm, 27.5″


The Alchemy Arktos Frame is a carbon fiber, 150mm, 27.5″ chassis featuring cutting edge Sine Suspension, progressive carbon fiber technology with amazing geometry.


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Alchemy Arktos 27.5 Frame, 150mm, 27.5″

Check out the Alchemy Arktos 27.5 Custom Complete Builder for a custom build experience.

Thinking about a US made Arktos? Start designing the perfect color layout with our Custom Arktos Visualizer!

Sine Suspension 150mm travel, 27.5″, USA Built Custom Color Carbon Frame

The Arktos is a fun bike across a wide variety of trails due to it’s effective suspension system and geometry. Efficient while climbing, quick to put power down accelerating out of corners, and certainly competent in the steeps. At BikeCo we test a lot of bikes and the Arktos has certainly checked boxes with everyone here – it’s been a blast in a variety of terrain for a variety of riding styles. We are stoked to have the Alchemy Arktos available for our clients – so much that we brought in a full size run of demo bikes.

Sine Suspension:

The Arktos features a dual-linkage platform called “Sine Suspension” that Alchemy licensed exclusively from David Earle. The name “Sine” comes from the shock rate, which resembles a sine wave when graphed. It’s regressive through the first part of the travel to absorb small bumps and provide climbing traction. In the middle of the stroke, its progressive to avoid wallowing on big hits or in hard, fast corners. Then it’s 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. With this bike you could talk technologies and physics all day long, but none of that stuff really matters the moment that you feel the efficiency, responsiveness and control the Arktos gives you on any terrain. It will truly transform what you thought you could do on the mountain.

By comparison the Sine Suspension rides a bit like a VPP, or Virtual Pivot Point, bike. The Arktos is poppy, quick and fun but has a more refined feel particularly early in the travel where it has better small bump compliance and tracking than a typical VPP.



  • Wheel size: 650b/27.5″
  • Max tire clearance: 2.4″
  • Boost 148 mm rear spacing
  • Travel: 150mm / 6″
  • Fox Float X shock
  • Bottom bracket: 73 mm threaded
  • Seat post: 31.6 mm
  • Headset: IS41 upper – IS52 lower
  • Drive train: 1x

Interested in a US produced, custom color Alchemy Arktos? Of course you are!

Additional information

Frame Brand


Stock Status
Frame Wheel Size


Frame Wheel Size Alchemy