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Arktos 27.5 Frame

Featuring Alchemy’s exclusive Sine full-suspension system
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.

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Assembly Build Specs Geometry

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SRAM NX Eagle SRAM GX Eagle Shimano XT 11 Speed Shimano XT 12 Speed SRAM X01 Eagle Shimano XTR
Price $4,899 Sold Out $5,199 Sold Out $5,399 Sold Out $6,099 Sold Out $6,699 Sold Out $9,499 Sold Out
Fork Rock Shox Yari RC 27 SB 170 BLK 46 B Fox 36 Factory Grip 2 170mm Boost 15mm Grip 2 Fox 36 Factory Grip 2 170mm Boost 15mm Grip 2 Fox 36 Factory Grip 2 170mm Boost 15mm Grip 2 Fox 36 Factory Grip 2 170mm Boost 15mm Grip 2 Fox 36 Factory Grip 2 170mm Boost 15mm Grip 2
Shock 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 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 Fox Factory 125mm Transfer 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 GX Eagle Shimano XT 11-Speed Shimano XT 12-Speed SRAM X01 Eagle Shimano XTR 12-Speed
Rear Derailleur SRAM NX EAGLE SRAM GX Eagle Shimano XT 11-Speed Shimano XT 12-Speed SRAM X01 Eagle Shimano XTR 12-Speed
Cassette SRAM NX Eagle 11-50T SRAM GX Eagle 10-50T Shimano XT 11-Speed 11-46T Shimano XT 12-Speed 10-51T SRAM XG EAGLE 10-50T Shimano XTR 12-Speed 11-50T
Cranks SRAM NX EAGLE DUB 175 SRAM GX EAGLE SB+ DUB 175 Shimano XT 175mm 11-Speed 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+ Shimano XT Threaded Shimano XT Threaded SRAM BB DUB BSA SB+ Shimano XTR Threaded
Chain SRAM NX Eagle 12 Speed SRAM GX Eagle 12 Speed Shimano XT 11 Speed Shimano XT 12 Speed SRAM GX Eagle 12 Speed Shimano XTR 12 Speed
Brakes SRAM Guide T Shimano XT Shimano XT Shimano XT Shimano XT Shimano XTR
Rotors SRAM 180MM Centerlock Shimano 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 12/148mm
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

Wondering which seat post travel is best for you? You can read up on proper size selection here.

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

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