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Alchemy 10 Year Logo

Arktos 27.5

Carbon // 27.5" // 152MM rear // 170MM front // Starting at $2999
 

Bike Builder

Delivery Straight to Your Door: Minimal Assembly Required.

The bike that started it all…the Arktos 27.5
The Arktos features famed designer David Earle’s patented dual-linkage suspension platform called “Sine”. The name “Sine” derives from the shock rate, which resembles a sine wave when graphed. The design creates suspension that is regressive through the first part of the travel to absorb small bumps and provide climbing traction, is progressive in the middle to avoid wallowing on big hits or in hard, fast corners, and is regressive again in the last 15 percent of the stroke so the bike can use all of its rear-wheel travel. It’s efficient, responsive and provides downhill capabilities unparalleled in today’s crop of modern trail bikes.

It will truly transform your ride.

Frameset Features

Exclusive Patented Sine Suspension System

The Arktos is a one-of-a-kind, do-it-all full-suspension bike designed to climb and descend with the same aplomb. The Arktos features a patented dual-linkage platform called the Sine Suspension, which was designed by suspension guru David Earle. The Sine name is derived from the way the shock rate, when graphed, resembles a sine wave. With Sine, there is regression through the first part of the travel to absorb small bumps and provide climbing traction, progression in the middle of the stroke to avoid wallowing on big hits or in hard, fast corners, and then slight regression again at end stroke to enable full use of rear wheel travel. Sine is also designed to minimize chainstay growth to improve pedaling efficiency and keep the suspension active under braking.

Learn about Sine Suspension

Fully Triangulated Rear Swingarm

Modern trail bikes today are being ridden on terrain that only a DH bike would have tackled a few years ago. As a result, the requirements for frame stiffness are increasing every year. Luckily if you are riding an Arktos, you are riding one of the laterally stiffest bikes ever produced, and one of the big reasons for this is the full triangulated rear swingarm. The Arktos by design is made to handle all you can throw at it.

The Details

They say the devil is in the details, and there’s not doubt we focused on the minutia with the Arktos 27.5. The bike features details like internal cable routing and a direct mount chain guide, as well as every bike features Fox Factory suspension both front and rear. The rear shock has been specially tuned for Alchemy to provide the best in pedaling efficiency and downhill performance and all of the bikes are using stiff and light Fox 36 forks.

Alchemy Arktos 27.5 high up in the mountains of Colorado
Alchemy Arktos 27.5 going around a berm on a trail in the forest.
 

What People Are Saying About Alchemy

"I had an absolutely fantastic time riding the Arktos both uphill and downhill and that fun to ride feeling is ultimately what a great bike is all about." -Jeff
"The Alchemy Arktos feels stable at speed and gives you the confidence to hit jumps and drops and not really worry about where you land. Power, pop and plough." -Singletrackworld
"I decided on waiting the 60 days for the American-made Arktos 27.5 and I could not be happier. The custom paint job really is a stand out feature." -Ted

Geometry


S M L XL
170mm Fork | 39mm Offset Fork
Seat Tube Length 420 455 483 518
Effective Top Tube 585 600 615 642
Head Tube Length 100 110 115 130
Head Tube Angle 65.5 65.5 65.5 65.5
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
Bottom Bracket Height 346 346 346 346
Wheelbase 1161 1171 1185 1212
Standover 756 780 798 826
Frame Geometry
 
Arktos 27.5 Frame Sizing
S 5’1 – 5’5″
M 5’5″ – 5’9″
L 5’9″ – 6’1″
XL 6’1″ – 6’5″

Specs

SRAM NX Eagle SRAM NX Eagle + SRAM GX Eagle Shimano XT 12 Spd SRAM X01 Eagle Shimano XTR
Price $4,899 $3,899 $5,199 $4,199 $5,399 $4,399 $5,699 $4,699 $6,699 $5,699 $9,499 $8,499
Fork Rock Shox Yari RC 27 SB 170 BLK 46 B DVO Diamond D1 Black 27.5 Black 44mm Fox 36 Factory Kashima 170mm Boost 15mm Grip 2 Fox 36 Factory Kashima 170mm Boost 15mm Grip 2 Fox 36 Factory Kashima 170mm Boost 15mm Grip 2 Fox 36 Factory Kashima 170mm Boost 15mm Grip 2
Shock Fox DPX2 Factory Kashima EVOL LV 3-Position DVO Topaz T3 3-Position Adjust Fox DPX2 Factory Kashima EVOL LV 3-Position Fox DPX2 Factory Kashima EVOL LV 3-Position Fox DPX2 Factory Kashima EVOL LV 3-Position Fox DPX2 Factory Kashima EVOL LV 3-Position
Handlebar Race Face Aeffect R 35×780 Race Face Aeffect R 35×780 Race Face Aeffect R 35×780 Race Face Turbine R 35X780mm Race Face Turbine R 35X780mm ENVE M6 780mm
Stem Race Face Aeffect R 50mm Race Face Aeffect R 50mm Race Face Aeffect R 50mm Race Face Turbine R 50mm Race Face Turbine R 50mm ENVE M6 55mm
Seat Post X-Fusion Manic 150mm 31.6mm X-Fusion Manic 150mm 31.6mm X-Fusion Manic 150mm 31.6mm Fox Factory 125mm Transfer Fox Factory 125mm Transfer Fox Factory 125mm Transfer
Grips DMR DeathGrip Thin DMR DeathGrip Thin DMR DeathGrip Thin DMR DeathGrip Thin DMR DeathGrip Thin DMR DeathGrip Thin
Headset Top Cane Creek 40-Series IS41 Cane Creek 40-Series IS41 Cane Creek 40-Series IS41 Cane Creek 40-Series IS41 Cane Creek 40-Series IS41 Cane Creek 40-Series IS41
Headset Bottom Cane Creek 40-Series IS52 Cane Creek 40-Series IS52 Cane Creek 40-Series IS52 Cane Creek 40-Series IS52 Cane Creek 40-Series IS52 Cane Creek 40-Series IS52
Spacer Cane Creek 40-Series 5MM Spacer Cane Creek 40-Series 5MM Spacer Cane Creek 40-Series 5MM Spacer Cane Creek 40-Series 5MM Spacer Cane Creek 40-Series 5MM Spacer Cane Creek 40-Series 5MM Spacer
Saddle WTB Volt Comp WTB Volt Comp WTB Volt Comp WTB Volt Comp WTB Volt Race WTB Volt Race
Shifters SRAM NX EAGLE SRAM NX EAGLE SRAM GX Eagle Shimano XT 12-Speed SRAM X01 Eagle Shimano XTR 12-Speed
Rear Derailleur SRAM NX EAGLE SRAM NX EAGLE SRAM GX Eagle Shimano XT 12-Speed SRAM X01 Eagle Shimano XTR 12-Speed
Cassette SRAM NX Eagle 11-50T SRAM NX Eagle 11-50T SRAM GX Eagle 10-50T Shimano XT 12-Speed 10-51T SRAM XG EAGLE 10-50T Shimano XTR 12-Speed 11-50T
Cranks SRAM NX EAGLE DUB 175 SRAM NX EAGLE DUB 175 SRAM GX EAGLE SB+ DUB 175 Shimano XT 170mm 12-Speed SRAM X01 EAGLE DUB 175 Shimano XTR 170mm 12-Speed
Bottom Bracket SRAM BB DUB BSA SB+ SRAM BB DUB BSA SB+ SRAM BB DUB BSA SB+ Shimano XT Threaded SRAM BB DUB BSA SB+ Shimano XTR Threaded
Chain SRAM NX Eagle 12 Speed SRAM NX Eagle 12 Speed SRAM GX Eagle 12 Speed Shimano XT 12 Speed SRAM GX Eagle 12 Speed Shimano XTR 12 Speed
Brakes SRAM Guide T SRAM Guide T Shimano XT Shimano XT Shimano XT Shimano XTR
Rotors SRAM 180MM Centerlock SRAM 180MM Centerlock Shimano 180mm Centerlock Shimano 180mm Centerlock Shimano 180mm Centerlock Shimano XTR 180mm Centerlock
Front Wheel DT Swiss M 1700 SPLINE 27.5 15/110mm DT Swiss M 1700 SPLINE 27.5 15/110mm DT Swiss M 1700 SPLINE 27.5 15/110mm DT Swiss M 1700 SPLINE 27.5 15/110mm DT Swiss M 1700 SPLINE 27.5 15/110mm ENVE M630 Carbon I9 Hydra 15/110mm
Rear Wheel DT Swiss M1700 SPLINE 27.5 12/148mm DT Swiss M1700 SPLINE 27.5 12/148mm DT Swiss M1700 SPLINE 27.5 12/148mm DT Swiss M1700 SPLINE 27.5 12/148mm DT Swiss M1700 SPLINE 27.5 12/148mm ENVE M630 Carbon I9 Hydra 12/157mm Boost
Tires Maxxis Minion DHF 27.5×2.5, Minion DHR 27.5×2.4 Maxxis Minion DHF 27.5×2.5, Minion DHR 27.5×2.4 Maxxis Minion DHF 27.5×2.5, Minion DHR 27.5×2.4 Maxxis Minion DHF 27.5×2.5, Minion DHR 27.5×2.4 Maxxis Minion DHF 27.5×2.5, Minion DHR 27.5×2.4 Maxxis Minion DHF 27.5×2.5, Minion DHR 27.5×2.4

Pricing and specifications subject to change at any time without notice.

Free Shipping on All Bikes

Not everyone can visit Alchemy, so we made things easy. When you buy a bike from us, you get free shipping. And if you need help with final assembly, contact us for a credit.

Two Weeks, Risk-Free

Purchasing your dream ride is a substantial investment, so here’s our promise: If you are not 100% satisfied with your new Alchemy Bicycle, you have two weeks from date of purchase to return it.

No Questions Returns

If at the end of two weeks you are not 100% satisfied with your new bike, call us to arrange a full refund or credit toward another Alchemy.